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Your search keyword '"Apostolis Verykios"' showing total 3 results
Start Over Author "Apostolis Verykios" Publisher american chemical society (acs)
3 results on '"Apostolis Verykios"'

1. Manganese Porphyrin Interface Engineering in Perovskite Solar Cells

Author

Matthias J. Golomb, Stella Kennou, Aron Walsh, Konstantina Gkini, Charalampos Drivas, Maria Christina Skoulikidou, Nikolaos Balis, Maria Vasilopoulou, Athanassios G. Coutsolelos, Apostolis Verykios, Polycarpos Falaras, and Michael Papadakis

Subjects
Interface engineering, Materials science, Photovoltaic system, Energy Engineering and Power Technology, chemistry.chemical_element, Manganese, Porphyrin, chemistry.chemical_compound, Planar, chemistry, Chemical engineering, Manganese porphyrin, Materials Chemistry, Electrochemistry, Chemical Engineering (miscellaneous), Electrical and Electronic Engineering, Interfacial engineering, Perovskite (structure)
Abstract

An interfacial engineering approach was adopted in order to optimize the photovoltaic parameters and the stability of n-i-p planar perovskite solar cells (PSCs). A thin manganese (Mn) porphyrin [(T...

Published
2020

2. Triazine-Substituted Zinc Porphyrin as an Electron Transport Interfacial Material for Efficiency Enhancement and Degradation Retardation in Planar Perovskite Solar Cells

Author

Stella Kennou, Maria-Christina Skoulikidou, Athanassios G. Kontos, Nikolaos Balis, Anastasia Soultati, Mihalis Fakis, Fotis Kournoutas, Vassilios Constantoudis, Maria Vasilopoulou, Charalampos Drivas, Michael Papadakis, Apostolis Verykios, Polycarpos Falaras, Athanassios G. Coutsolelos, and Spyros Gardelis

Subjects
Materials science, Energy conversion efficiency, Energy Engineering and Power Technology, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Electron transport chain, Porphyrin, 0104 chemical sciences, chemistry.chemical_compound, Electron transfer, chemistry, Chemical engineering, Titanium dioxide, Materials Chemistry, Electrochemistry, Chemical Engineering (miscellaneous), Electrical and Electronic Engineering, 0210 nano-technology, Layer (electronics), Perovskite (structure), Triazine
Abstract

Motivated by the excellent electron-transfer capability of porphyrin molecules in natural photosynthesis, we introduce here the first application of a porphyrin compound to improve the performance of planar perovskite solar cells. The insertion of a thin layer consisting of a triazine-substituted Zn porphyrin between the TiO2 electron transport layer and the CH3NH3PbI3 perovskite film significantly augmented electron transfer toward TiO2 while also sufficiently improved the morphology of the perovskite film. The devices employing porphyrin-modified TiO2 exhibited a significant increase in the short-circuit current densities and a small increase in the fill factor. As a result, they delivered a maximum power conversion efficiency (PCE) of 16.87% (average 14.33%), which represents a 12% enhancement compared to 15.01% (average 12.53%) of the reference cell. Moreover, the porphyrin-modified cells exhibited improved hysteretic behavior and a higher stabilized power output of 14.40% compared to 10.70% of the re...

Published
2018

3. Engineering of Porphyrin Molecules for Use as Effective Cathode Interfacial Modifiers in Organic Solar Cells of Enhanced Efficiency and Stability

Author

Evangelos Evangelou, Vasilis Nikolaou, Dimitris Davazoglou, Spyros Gardelis, Maria Vasilopoulou, Andreas Kaltzoglou, Ermioni Polydorou, Dimitris Tsikritzis, Florian Auras, Leonidas C. Palilis, Apostolis Verykios, Athanassios G. Coutsolelos, Marinos Tountas, Polycarpos Falaras, Panagiotis A. Angaridis, Anastasia Soultati, George J. Papaioannou, Panagiotis Argitis, Ioannis D. Petsalakis, Nikolaos Balis, Matroni Koutsoureli, Michael Papadakis, and Stella Kennou

Subjects
Materials science, Organic solar cell, Energy conversion efficiency, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Porphyrin, Electron transport chain, Surface energy, Cathode, 0104 chemical sciences, law.invention, chemistry.chemical_compound, Electron transfer, chemistry, Chemical engineering, law, General Materials Science, Work function, 0210 nano-technology
Abstract

In the present work, we effectively modify the TiO2 electron transport layer of organic solar cells with an inverted architecture using appropriately engineered porphyrin molecules. The results show that the optimized porphyrin modifier bearing two carboxylic acids as the anchoring groups and a triazine electron-withdrawing spacer significantly reduces the work function of TiO2, thereby reducing the electron extraction barrier. Moreover, the lower surface energy of the porphyrin-modified substrate results in better physical compatibility between the latter and the photoactive blend. Upon employing porphyrin-modified TiO2 electron transport layers in PTB7:PC71BM-based organic solar cells we obtained an improved average power conversion efficiency up to 8.73%. Importantly, porphyrin modification significantly increased the lifetime of the devices, which retained 80% of their initial efficiency after 500 h of storage in the dark. Because of its simplicity and efficacy, this approach should give tantalizing g...

Published
2018

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