Search

Your search keyword '"Vangerven, Tim"' showing total 31 results
Start Over Author "Vangerven, Tim" Publication Year Range Last 50 years
31 results on '"Vangerven, Tim"'

1. Organic and perovskite solar cells for space applications

Author

Cardinaletti, Ilaria, Vangerven, Tim, Nagels, Steven, Cornelissen, Rob, Schreurs, Dieter, Hruby, Jaroslav, Vodnik, Jelle, Devisscher, Dries, Kesters, Jurgen, DHaen, Jan, Franquet, Alexis, Spampinato, Valentina, Conard, Thierry, Maes, Wouter, Deferme, Wim, and Manca, Jean V.

Subjects
Physics - Applied Physics
Abstract

For almost sixty years, solar energy for space applications has relied on inorganic photovoltaics, evolving from solar cells made of single crystalline silicon to triple junctions based on germanium and III-V alloys. The class of organic-based photovoltaics, which ranges from all-organic to hybrid perovskites, has the potential of becoming a disruptive technology in space applications, thanks to the unique combination of appealing intrinsic properties (e.g. record high specific power, tunable absorption window) and processing possibilities. Here, we report on the launch of the stratospheric mission OSCAR, which demonstrated for the first time organic-based solar cell operation in extra-terrestrial conditions. This successful maiden flight for organic-based photovoltaics opens a new paradigm for solar electricity in space, from satellites to orbital and planetary space stations.

Published
2017
Full Text
View/download PDF

7. BEXUS 23 OSCAR: Solar Cell I-V Monitoring System for Space Environments

Author

NAGELS, Steven, CARDINALETTI, Ilaria, CORNELISSEN, Rob, SCHREURS, Dieter, VANGERVEN, Tim, VODNIK, Jelle, HRUBY, Jaroslav, NESLADEK, Milos, MANCA, Jean, DEFERME, Wim, NAGELS, Steven, CARDINALETTI, Ilaria, CORNELISSEN, Rob, SCHREURS, Dieter, VANGERVEN, Tim, VODNIK, Jelle, HRUBY, Jaroslav, NESLADEK, Milos, MANCA, Jean, and DEFERME, Wim

Subjects
organic photovoltaics, organische zonnecellen, space, ruimte, degradation, I-V measurement, measuring setup, meetsysteem
Abstract

Novel thin film solar cells exhibit unprecedented specific power, which is a key figure of merit for space applications. To get a first indication of their possible degradation in space environments, the OSCAR (‘Optical Sensors based on CARbon materials’) team has built a solar cell performance monitoring system and deployed it on the BEXUS 23 flight. This paper reports the design, testing and performance of said system. Our system performed impeccably over its 4h mission course, maintaining communication and reliably reporting solar cell I-V curves. It forms a guideline for anyone who needs to measure millivolts and microamperes in similar conditions, monitor solar cells on remote locations or wants to follow up on degradation of thin film solar cells in space.

Published
2017

8. ESA–BEXUS project: OSCAR - Zonne-Energie Voor De Planeet Aarde En Verder

Author

NAGELS, Steven, Beynaerts, Miguel-Angel, CARDINALETTI, Ilaria, CORNELISSEN, Rob, HRUBY, Jaroslav, SCHREURS, Dieter, VODNIK, Jelle, VANGERVEN, Tim, Wouters, Koen, NAGELS, Steven, Beynaerts, Miguel-Angel, CARDINALETTI, Ilaria, CORNELISSEN, Rob, HRUBY, Jaroslav, SCHREURS, Dieter, VODNIK, Jelle, VANGERVEN, Tim, and Wouters, Koen

Subjects
organic photovoltaics, zonnecellen, OSCAR, REXUS/BEXUS, BEXUS, ESA, space, onderzoeksballon
Abstract

Zonne–energie is ontegensprekelijk één van de belangrijkste en duurzaamste oplossingen voor de globale energie– en klimaatuitdagingen waar onze planeet voor staat. Nieuwe generatie printbare, plooibare en ultra–dunnen zonnecellen kunnen bovendien leiden tot tal van nieuwe toepassingen, gaande van energie–bevoorrading voor draag bare elektronica (smartphones, tablets, …) tot grensverleggende toepassingen voor toekomstige ruimtereizen. Printbare organische en perovskiet–zonnecellen zijn namelijk de wereldkampioenen qua verhouding energie–opbrengst versus gewicht. Voor toekomstige ruimtevaartmissies hebben deze zonnecellen dus de bijzondere voordelen dat ze een ultra–licht gewicht hebben, plooibaar en uitvouwbaar zijn en bovendien ter plaatse (in ruimteschepen of in ruimtestations op bijvoorbeeld de Maan of op Mars) kunnen geprint worden. Door deelname aan het BEXUS–programma (Balloon Experiments for University Students) van de Europese ruimtevaartorganisatie ESA, hebben een team van negen UHasselt–doctoraatstudenten en studenten Fysica (Miguel–Angel Beynaerts, Ilaria Cardinaletti, Rob Cornelissen, Jaroslav Hruby, Steven Nagels, Dieter Schreurs, Jelle Vodnik, Tim Vangerven & Koen Wouters) een wereldrecord gebroken qua gebruik van printbare zonnecellen op grote hoogte. Met het OSCAR–project (Optical Sensors based on CARbon Materials) hebben ze voor het eerste de prestaties van printbare zonnecellen en van een nieuwe magnetische–veldsensor bestudeerd in echte ruimtevaartcondities. Vanuit het lanceerstation Kiruna in Zweden werd een onderzoeksballon in de stratosfeer gebracht — op 32 kilometer hoogte (3x hoogte van vliegtuigtrajecten) — waarbij extreme condities heersen zoals lage luchtdruk, lage temperaturen (tot wel –60 graden Celsius) en een pak meer straling van de zon.

Published
2017

9. Absorption Tails of Donor

Author

Vandewal, Koen, Benduhn, Johannes, Schellhammer, Karl Sebastian, Vangerven, Tim, Rückert, Janna E., Piersimoni, Fortunato, Scholz, Reinhard, Zeika, Olaf, Fan, Yeli, Barlow, Stephen, Neher, Dieter (Prof. Dr.), Marder, Seth R., Manca, Jean, Spoltore, Donato, Cuniberti, Gianaurelio, and Ortmann, Frank

Subjects
Institut für Physik und Astronomie, ddc:530
Abstract

In disordered organic semiconductors, the transfer of a rather localized charge carrier from one site to another triggers a deformation of the molecular structure quantified by the intramolecular relaxation energy. A similar structural relaxation occurs upon population of intermolecular charge-transfer (CT) states formed at organic electron donor (D)-acceptor (A) interfaces. Weak CT absorption bands for D A complexes occur at photon energies below the optical gaps of both the donors and the C-60 acceptor as a result of optical transitions from the neutral ground state to the ionic CT state. In this work, we show that temperature-activated intramolecular vibrations of the ground state play a major role in determining the line shape of such CT absorption bands. This allows us to extract values for the relaxation energy related to the geometry change from neutral to ionic CT complexes. Experimental values for the relaxation energies of 20 D:C-60 CT complexes correlate with values calculated within density functional theory. These results provide an experimental method for determining the polaron relaxation energy in solid-state organic D-A blends and show the importance of a reduced relaxation energy, which we introduce to characterize thermally activated CT processes.

Published
2017

10. Organic and perovskite solar cells for space applications

Author

Cardinaletti, Ilaria, primary, Vangerven, Tim, additional, Nagels, Steven, additional, Cornelissen, Rob, additional, Schreurs, Dieter, additional, Hruby, Jaroslav, additional, Vodnik, Jelle, additional, Devisscher, Dries, additional, Kesters, Jurgen, additional, D’Haen, Jan, additional, Franquet, Alexis, additional, Spampinato, Valentina, additional, Conard, Thierry, additional, Maes, Wouter, additional, Deferme, Wim, additional, and Manca, Jean V., additional

Published
2018
Full Text
View/download PDF

11. Absorption Tails of Donor:C60 Blends Provide Insight into Thermally Activated Charge-Transfer Processes and Polaron Relaxation

Author

Vandewal, Koen, primary, Benduhn, Johannes, additional, Schellhammer, Karl Sebastian, additional, Vangerven, Tim, additional, Rückert, Janna E., additional, Piersimoni, Fortunato, additional, Scholz, Reinhard, additional, Zeika, Olaf, additional, Fan, Yeli, additional, Barlow, Stephen, additional, Neher, Dieter, additional, Marder, Seth R., additional, Manca, Jean, additional, Spoltore, Donato, additional, Cuniberti, Gianaurelio, additional, and Ortmann, Frank, additional

Published
2017
Full Text
View/download PDF

12. Designing Small Molecule Organic Solar Cells with High Open-Circuit Voltage

Author

Kudrjasova, Julija, primary, Van Landeghem, Melissa, additional, Vangerven, Tim, additional, Kesters, Jurgen, additional, Heintges, Gaël H. L., additional, Cardinaletti, Ilaria, additional, Lenaerts, Ruben, additional, Penxten, Huguette, additional, Adriaensens, Peter, additional, Lutsen, Laurence, additional, Vanderzande, Dirk, additional, Manca, Jean, additional, Goovaerts, Etienne, additional, and Maes, Wouter, additional

Published
2017
Full Text
View/download PDF

13. Elucidating Batch-to-Batch Variation Caused by Homocoupled Side Products in Solution-Processable Organic Solar Cells

Author

Vangerven, Tim, primary, Verstappen, Pieter, additional, Patil, Nilesh, additional, D’Haen, Jan, additional, Cardinaletti, Ilaria, additional, Benduhn, Johannes, additional, Van den Brande, Niko, additional, Defour, Maxime, additional, Lemaur, Vincent, additional, Beljonne, David, additional, Lazzaroni, Roberto, additional, Champagne, Benoit, additional, Vandewal, Koen, additional, Andreasen, Jens W., additional, Adriaensens, Peter, additional, Breiby, Dag W., additional, Van Mele, Bruno, additional, Vanderzande, Dirk, additional, Maes, Wouter, additional, and Manca, Jean, additional

Published
2016
Full Text
View/download PDF

15. A direct arylation approach towards efficient small molecule organic solar cells

Author

Kudrjasova, Julija, primary, Kesters, Jurgen, additional, Verstappen, Pieter, additional, Brebels, Jeroen, additional, Vangerven, Tim, additional, Cardinaletti, Ilaria, additional, Drijkoningen, Jeroen, additional, Penxten, Huguette, additional, Manca, Jean, additional, Lutsen, Laurence, additional, Vanderzande, Dirk, additional, and Maes, Wouter, additional

Published
2016
Full Text
View/download PDF

17. Molecular imprinted polymer films on RFID tags: a first step towards disposable packaging sensors

Author

Croux, Dieter, Vangerven, Tim, Broeders, Jeroen, Boutsen, Jan, Peeters, Marloes, Duchateau, Stijn, Cleij, Thomas, Deferme, Wim, Wagner, Patrick, Thoelen, Ronald, De Ceuninck, Ward, Maastricht Science Programme, and RS: FSE MSP

Subjects
molecular imprinting, biomimetic sensors, screen-printing, wireless sensors
Abstract

Molecular imprinted polymer (mip) sensors offer a high potential in the development of cheap small-scale disposable biomimetic sensors. Molecular imprinting leads to the formation of inert polymer particles with nanocavities, which can exhibit similar selectivity and specificity to target molecules as antibodies or enzymes. These sensors open up many possible applications in the field of mass-market consumer products such as food packaging sensors. One such application is the detection of histamine in spoiled fish, which causes scombroid poisoning, a common seafood poisoning. This contribution provides one possible solution for easing the use of these sensors in field applications. A screen-printed short-range wireless mip-based biosensor based upon passive radio frequency identification (rfid) tags was developed as a proof of principle. Histamine molecules binding to an mip recognition layer induce a dielectric change in the sensor capacitance, resulting in a resonance frequency shift that is transmitted by inductive coupling. This wireless sensor is capable of detecting histamine concentrations as low as 50 nm at a range of a few centimeters.

Published
2013

18. Simultaneous Enhancement of Solar Cell Efficiency and Stability by Reducing the Side Chain Density on Fluorinated PCPDTQx Copolymers

Author

Verstappen, Pieter, primary, Kesters, Jurgen, additional, D’Olieslaeger, Lien, additional, Drijkoningen, Jeroen, additional, Cardinaletti, Ilaria, additional, Vangerven, Tim, additional, Bruijnaers, Bardo J., additional, Willems, Robin E. M., additional, D’Haen, Jan, additional, Manca, Jean V., additional, Lutsen, Laurence, additional, Vanderzande, Dirk J. M., additional, and Maes, Wouter, additional

Published
2015
Full Text
View/download PDF

20. N-acyl-dithieno[3,2-b:2’,3’-d]pyrrole-based low bandgap copolymers affording improved open-circuit voltages and efficiencies in polymer solar cells

Author

Kesters, Jurgen, primary, Verstappen, Pieter, additional, Vanormelingen, Wouter, additional, Drijkoningen, Jeroen, additional, Vangerven, Tim, additional, Devisscher, Dries, additional, Marin, Lidia, additional, Champagne, Benoît, additional, Manca, Jean, additional, Lutsen, Laurence, additional, Vanderzande, Dirk, additional, and Maes, Wouter, additional

Published
2015
Full Text
View/download PDF

21. Fluorination as an effective tool to increase the open-circuit voltage and charge carrier mobility of organic solar cells based on poly(cyclopenta[2,1-b:3,4-b′]dithiophene-alt-quinoxaline) copolymers

Author

Verstappen, Pieter, primary, Kesters, Jurgen, additional, Vanormelingen, Wouter, additional, Heintges, Gaël H. L., additional, Drijkoningen, Jeroen, additional, Vangerven, Tim, additional, Marin, Lidia, additional, Koudjina, Simplice, additional, Champagne, Benoît, additional, Manca, Jean, additional, Lutsen, Laurence, additional, Vanderzande, Dirk, additional, and Maes, Wouter, additional

Published
2015
Full Text
View/download PDF

23. Worldwide outdoor round robin study of organic photovoltaic devices and modules

Author

Madsen, Morten V, Gevorgyan, Suren A, Pacios, R, Ajuria, J, Etxebarria, I, Kettle, Jeff, Bristow, Noel D, Neophytou, Marios, Choulis, Stelios A, Stolz Roman, Lucimara, Yohannes, Teketel, Cester, Andrea, Cheng, Pei, Zhan, Xiaowei, Wu, Jiang, Xie, Zhiyuan, Tu, Wei-Chen, He, Jr-Hau, Fell, Christopher J, Anderson, Kenrick, Hermenau, Martin, Bartesaghi, Davide, Jan Anton Koster, L, Machui, Florian, Gonzalez-Valls, Irene, Lira-Cantu, Monica, Khlyabich, Petr P, Thompson, Barry C, Gupta, Ritu, Shanmugam, Kiruthika, Kulkarni, Giridhar U, Galagan, Yulia, Urbina, Antonio, Abad, Jose, Roesch, Roland, Hoppe, Harald, Morvillo, P, Bobeico, E, Panaitescu, Eugen, Menon, Latika, Luo, Qun, Wu, Zhenwu, Ma, Changqii, Hambarian, Artak, Melikyan, Varuzhan, Hambsch, M, Burn, Paul L, Meredith, Paul, Rath, Thomas, Dunst, Sebastian, Trimmel, Gregor, Bardizza, Giorgio, Mullejans, Harald, Goryachev, A E, Misra, Ravi K, Katz, Eugene A, Takagi, Katsuhiko, Magaino, Shinichi, Saito, Hidenori, Aoki, Daisuke, Sommeling, Paul M, Kroon, Jan M, Vangerven, Tim, Manca, Jean, Kesters, Jurgen, Maes, Wouter, Bobkova, Olga D, Trukhanov, Vasily A, Paraschuk, Dmitry Yu, Castro, Fernando A, Blakesley, James, Tuladhar, Sachetan M, Rohr, Jason Alexander, Nelson, Jenny, Xia, Jiangbin, Parlak, Elif Alturk, Tumay, Tulay Alsi, Egelhaaf, Hans-Joachim, Tanenbaum, David M, Ferguson, Gretta Mae, Carpenter, Robert, Chen, Hongzheng, Zimmermann, Birger, Hirsch, Lionel, Wantz, Guillaume, Sun, Ziqi, Singh, Pradeep, Bapat, Chaitnya, Offermans, Ton, Krebs, Frederik C, Madsen, Morten V, Gevorgyan, Suren A, Pacios, R, Ajuria, J, Etxebarria, I, Kettle, Jeff, Bristow, Noel D, Neophytou, Marios, Choulis, Stelios A, Stolz Roman, Lucimara, Yohannes, Teketel, Cester, Andrea, Cheng, Pei, Zhan, Xiaowei, Wu, Jiang, Xie, Zhiyuan, Tu, Wei-Chen, He, Jr-Hau, Fell, Christopher J, Anderson, Kenrick, Hermenau, Martin, Bartesaghi, Davide, Jan Anton Koster, L, Machui, Florian, Gonzalez-Valls, Irene, Lira-Cantu, Monica, Khlyabich, Petr P, Thompson, Barry C, Gupta, Ritu, Shanmugam, Kiruthika, Kulkarni, Giridhar U, Galagan, Yulia, Urbina, Antonio, Abad, Jose, Roesch, Roland, Hoppe, Harald, Morvillo, P, Bobeico, E, Panaitescu, Eugen, Menon, Latika, Luo, Qun, Wu, Zhenwu, Ma, Changqii, Hambarian, Artak, Melikyan, Varuzhan, Hambsch, M, Burn, Paul L, Meredith, Paul, Rath, Thomas, Dunst, Sebastian, Trimmel, Gregor, Bardizza, Giorgio, Mullejans, Harald, Goryachev, A E, Misra, Ravi K, Katz, Eugene A, Takagi, Katsuhiko, Magaino, Shinichi, Saito, Hidenori, Aoki, Daisuke, Sommeling, Paul M, Kroon, Jan M, Vangerven, Tim, Manca, Jean, Kesters, Jurgen, Maes, Wouter, Bobkova, Olga D, Trukhanov, Vasily A, Paraschuk, Dmitry Yu, Castro, Fernando A, Blakesley, James, Tuladhar, Sachetan M, Rohr, Jason Alexander, Nelson, Jenny, Xia, Jiangbin, Parlak, Elif Alturk, Tumay, Tulay Alsi, Egelhaaf, Hans-Joachim, Tanenbaum, David M, Ferguson, Gretta Mae, Carpenter, Robert, Chen, Hongzheng, Zimmermann, Birger, Hirsch, Lionel, Wantz, Guillaume, Sun, Ziqi, Singh, Pradeep, Bapat, Chaitnya, Offermans, Ton, and Krebs, Frederik C

Abstract

Accurate characterization and reporting of organic photovoltaic (OPV) device performance remains one of the important challenges in the field. The large spread among the efficiencies of devices with the same structure reported by different groups is significantly caused by different procedures and equipment used during testing. The presented article addresses this issue by offering a new method of device testing using "suitcase sample" approach combined with outdoor testing that limits the diversity of the equipment, and a strict measurement protocol. A round robin outdoor characterization of roll-to-roll coated OPV cells and modules conducted among 46 laboratories worldwide is presented, where the samples and the testing equipment were integrated in a compact suitcase that served both as a sample transportation tool and as a holder and test equipment during testing. In addition, an internet based coordination was used via plasticphotovoltaics.org that allowed fast and efficient communication among participants and provided a controlled reporting format for the results that eased the analysis of the data. The reported deviations among the laboratories were limited to 5% when compared to the Si reference device integrated in the suitcase and were up to 8% when calculated using the local irradiance data. Therefore, this method offers a fast, cheap and efficient tool for sample sharing and testing that allows conducting outdoor measurements of OPV devices in a reproducible manner.

Published
2014

25. Worldwide outdoor round robin study of organic photovoltaic devices and modules

Author

Madsen, Morten V., primary, Gevorgyan, Suren A., additional, Pacios, R., additional, Ajuria, J., additional, Etxebarria, I., additional, Kettle, Jeff, additional, Bristow, Noel D., additional, Neophytou, Marios, additional, Choulis, Stelios A., additional, Stolz Roman, Lucimara, additional, Yohannes, Teketel, additional, Cester, Andrea, additional, Cheng, Pei, additional, Zhan, Xiaowei, additional, Wu, Jiang, additional, Xie, Zhiyuan, additional, Tu, Wei-Chen, additional, He, Jr-Hau, additional, Fell, Christopher J, additional, Anderson, Kenrick, additional, Hermenau, Martin, additional, Bartesaghi, Davide, additional, Jan Anton Koster, L., additional, Machui, Florian, additional, González-Valls, Irene, additional, Lira-Cantu, Monica, additional, Khlyabich, Petr P., additional, Thompson, Barry C., additional, Gupta, Ritu, additional, Shanmugam, Kiruthika, additional, Kulkarni, Giridhar U., additional, Galagan, Yulia, additional, Urbina, Antonio, additional, Abad, Jose, additional, Roesch, Roland, additional, Hoppe, Harald, additional, Morvillo, P., additional, Bobeico, E., additional, Panaitescu, Eugen, additional, Menon, Latika, additional, Luo, Qun, additional, Wu, Zhenwu, additional, Ma, Changqi, additional, Hambarian, Artak, additional, Melikyan, Varuzhan, additional, Hambsch, M., additional, Burn, Paul L., additional, Meredith, Paul, additional, Rath, Thomas, additional, Dunst, Sebastian, additional, Trimmel, Gregor, additional, Bardizza, Giorgio, additional, Müllejans, Harald, additional, Goryachev, A.E., additional, Misra, Ravi K., additional, Katz, Eugene A., additional, Takagi, Katsuhiko, additional, Magaino, Shinichi, additional, Saito, Hidenori, additional, Aoki, Daisuke, additional, Sommeling, Paul M., additional, Kroon, Jan M., additional, Vangerven, Tim, additional, Manca, Jean, additional, Kesters, Jurgen, additional, Maes, Wouter, additional, Bobkova, Olga D., additional, Trukhanov, Vasily A., additional, Paraschuk, Dmitry Yu., additional, Castro, Fernando A., additional, Blakesley, James, additional, Tuladhar, Sachetan M, additional, Alexander Röhr, Jason, additional, Nelson, Jenny, additional, Xia, Jiangbin, additional, Parlak, Elif Alturk, additional, Tumay, Tülay Aslı, additional, Egelhaaf, Hans-Joachim, additional, Tanenbaum, David M., additional, Mae Ferguson, Gretta, additional, Carpenter, Robert, additional, Chen, Hongzheng, additional, Zimmermann, Birger, additional, Hirsch, Lionel, additional, Wantz, Guillaume, additional, Sun, Ziqi, additional, Singh, Pradeep, additional, Bapat, Chaitnya, additional, Offermans, Ton, additional, and Krebs, Frederik C., additional

Published
2014
Full Text
View/download PDF

26. Influence of fullerene photodimerization on the PCBM crystallization in polymer: Fullerene bulk heterojunctions under thermal stress

Author

Piersimoni, Fortunato, primary, Degutis, Giedrius, additional, Bertho, Sabine, additional, Vandewal, Koen, additional, Spoltore, Donato, additional, Vangerven, Tim, additional, Drijkoningen, Jeroen, additional, Van Bael, Marlies K., additional, Hardy, An, additional, D'Haen, Jan, additional, Maes, Wouter, additional, Vanderzande, Dirk, additional, Nesladek, Milos, additional, and Manca, Jean, additional

Published
2013
Full Text
View/download PDF

27. Imidazolium-Substituted Polythiophenes as Efficient Electron Transport Materials Improving Photovoltaic Performance

Author

Kesters, Jurgen, primary, Ghoos, Toon, additional, Penxten, Huguette, additional, Drijkoningen, Jeroen, additional, Vangerven, Tim, additional, Lyons, Dani M., additional, Verreet, Bregt, additional, Aernouts, Tom, additional, Lutsen, Laurence, additional, Vanderzande, Dirk, additional, Manca, Jean, additional, and Maes, Wouter, additional

Published
2013
Full Text
View/download PDF

30. Absorption Tails of Donor:C60 Blends Provide Insight into Thermally Activated Charge-Transfer Processes and Polaron Relaxation

Author

Johannes Benduhn, Gianaurelio Cuniberti, Tim Vangerven, Seth R. Marder, Jean Manca, Karl Sebastian Schellhammer, Reinhard Scholz, Yeli Fan, Frank Ortmann, Fortunato Piersimoni, Koen Vandewal, Donato Spoltore, Dieter Neher, Olaf Zeika, Stephen Barlow, Janna Elisabeth Rückert, VANDEWAL, Koen, Benduhn, Johannes, Schellhammer, Karl Sebastian, VANGERVEN, Tim, Rueckert, Janna E., PIERSIMONI, Fortunato, Scholz, Reinhard, Zeika, Olaf, Fan, Yeli, Barlow, Stephen, Neher, Dieter, Marder, Seth R., MANCA, Jean, SPOLTORE, Donato, Cuniberti, Gianaurelio, and Ortmann, Frank

Subjects
education.field_of_study, Chemistry, Intermolecular force, Population, Ionic bonding, 02 engineering and technology, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, Polaron, 01 natural sciences, Biochemistry, Acceptor, Catalysis, 0104 chemical sciences, Colloid and Surface Chemistry, Chemical physics, Intramolecular force, Relaxation (physics), Physics::Chemical Physics, Atomic physics, 0210 nano-technology, Ground state, education
Abstract

In disordered organic semiconductors, the transfer of a rather localized charge carrier from one site to another triggers a deformation of the molecular structure quantified by the intramolecular relaxation energy. A similar structural relaxation occurs upon population of intermolecular charge-transfer (CT) states formed at organic electron donor (D)-acceptor (A) interfaces. Weak CT absorption bands for D A complexes occur at photon energies below the optical gaps of both the donors and the C-60 acceptor as a result of optical transitions from the neutral ground state to the ionic CT state. In this work, we show that temperature-activated intramolecular vibrations of the ground state play a major role in determining the line shape of such CT absorption bands. This allows us to extract values for the relaxation energy related to the geometry change from neutral to ionic CT complexes. Experimental values for the relaxation energies of 20 D:C-60 CT complexes correlate with values calculated within density functional theory. These results provide an experimental method for determining the polaron relaxation energy in solid-state organic D-A blends and show the importance of a reduced relaxation energy, which we introduce to characterize thermally activated CT processes. This work was supported by the German Federal Ministry for Education and Research (BMBF) through the InnoProfille project "Organische p-i-n Bauelemente 2.2". F.O. would like to thank the German Research Foundation (DFG) for financial support (Grant OR 349/1). This work was partly supported by the DFG within the Cluster of Excellence "Center for Advancing Electronics Dresden." F.P. and D.N. acknowledge funding by the DFG via the SFB 951 "HIOS". T.V. acknowledges the Agency for Innovation by Science and Technology in Flanders (IWT) for funding his Ph.D. The work at Georgia Tech was supported by the Department of the Navy, Office of Naval Research Award No. N00014-14-1-0580 (CAOP MURI) and through a state-sponsored scholarship for graduate students to Y.F. from the China Scholarship Council. We acknowledge the Center for Information Services and High Performance Computing (ZIH) at TU Dresden for computational resources. We thank Prof. Bauerle from the University of Ulm for the supply of DH4T and DH6T and Markus Hummert for P4-Ph4-DIP and BP-Bodipy.

Published
2017

31. Absorption Tails of Donor:C 60 Blends Provide Insight into Thermally Activated Charge-Transfer Processes and Polaron Relaxation.

Author

Vandewal K, Benduhn J, Schellhammer KS, Vangerven T, Rückert JE, Piersimoni F, Scholz R, Zeika O, Fan Y, Barlow S, Neher D, Marder SR, Manca J, Spoltore D, Cuniberti G, and Ortmann F

Abstract

In disordered organic semiconductors, the transfer of a rather localized charge carrier from one site to another triggers a deformation of the molecular structure quantified by the intramolecular relaxation energy. A similar structural relaxation occurs upon population of intermolecular charge-transfer (CT) states formed at organic electron donor (D)-acceptor (A) interfaces. Weak CT absorption bands for D-A complexes occur at photon energies below the optical gaps of both the donors and the C 60 acceptor as a result of optical transitions from the neutral ground state to the ionic CT state. In this work, we show that temperature-activated intramolecular vibrations of the ground state play a major role in determining the line shape of such CT absorption bands. This allows us to extract values for the relaxation energy related to the geometry change from neutral to ionic CT complexes. Experimental values for the relaxation energies of 20 D:C 60 CT complexes correlate with values calculated within density functional theory. These results provide an experimental method for determining the polaron relaxation energy in solid-state organic D-A blends and show the importance of a reduced relaxation energy, which we introduce to characterize thermally activated CT processes.

Published
2017
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results