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25 results on '"MacNeill, Christopher M."'

16. Roles of thermal annealing in cyclopentadithiophene/thienopyrroledione:fullerene blended film and performance of organic photovoltaics

Author

Zheng, Qiao, primary, Fang, Guojia, additional, Coffin, Robert C., additional, MacNeill, Christopher M., additional, Li, Yuan, additional, Sun, Nanhai, additional, Qin, Pingli, additional, Nie, Wanyi, additional, Peterson, Eric D., additional, Fan, Xi, additional, Cheng, Fei, additional, Huang, Huihui, additional, Wang, Mingjun, additional, Zhao, Xingzhong, additional, and Carroll, David, additional

Published
2011
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17. Macromol. Rapid Commun. 15/2011

Author

Nie, Wanyi, primary, MacNeill, Christopher M., additional, Li, Yuan, additional, Noftle, Ronald E., additional, Carroll, David L., additional, and Coffin, Robert. C., additional

Published
2011
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19. Variation of the Side Chain Branch Position Leads to Vastly Improved Molecular Weight and OPV Performance in 4,8-dialkoxybenzo[1,2-b:4,5-b′]dithiophene/2,1,3-benzothiadiazole Copolymers

Author

Coffin, Robert C., primary, MacNeill, Christopher M., additional, Peterson, Eric D., additional, Ward, Jeremy W., additional, Owen, Jack W., additional, McLellan, Claire A., additional, Smith, Gregory M., additional, Noftle, Ronald E., additional, Jurchescu, Oana D., additional, and Carroll, David L., additional

Published
2011
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23. Exploring Spray-Coating Techniques for Organic Solar Cell Applications.

Author

Wanyi Nie, Coffin, Robert, Jiwen Liu, MacNeill, Christopher M., Yuan Li, Noftle, Ronald E., and Carroll, David L.

Subjects
SURFACE coatings, SOLAR cell design, PARAMETER estimation, ORGANIC solvents, ENERGY bands, BUTYRIC acid, DICHLOROBENZENE, PHOTOVOLTAIC cells
Abstract

We have investigated spray coating as a novel processing method for organic solar cell fabrication. In this work, spraying parameters and organic solvent influences have been correlated with cell performance. Using airbrush fabrication, bulk heteroj unction photovoltaic devices based on a new low band gap donor material: poly[(4,8-bis(1-pentylhexyloxy) benzo[1,2-b:4,5-b']dithiophene-2,6-diyl-alt-2,l,3-benzoxadiazole-4,7-diyl] with the C60-derivative (6,6)-phenyl C61-butyric acid methyl ester (PCBM) as an acceptor, have achieved power conversion efficiencies over 3%. We show that airbrush fabrication can be carried out with simple solvents such as pristine 1,2-dichlorobenzene. Moreover, the influence of device active area has been studied and the 1 cm2 device by spray coating maintained an excellent power conversion efficiency of 3.02% on average. [ABSTRACT FROM AUTHOR]

Published
2012
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24. Variation of the Side Chain Branch Position Leads to Vastly Improved Molecular Weight and OPV Performance in 4,8-dialkoxybenzo[1,2-b:4,5-b']dithiophene/ 2,1,3-benzothiadiazole Copolymers.

Author

Coffin, Robert C., MacNeill, Christopher M., Peterson, Eric D., Ward, Jeremy W., Owen, Jack W., McLellan, Claire A., Smith, Gregory M., Noftle, Ronald E., Jurchescu, Oana D., and Carroll, David L.

Subjects
MOLECULAR weights, COPOLYMERS, CHLOROFORM, ETHYLHEXANOL, ABSORPTION, THIN film transistors, SOLAR cells
Abstract

Through manipulation of the solubilizing side chains, we were able to dramatically improve the molecular weight (Mw) of 4,8-dialkoxybenzo[1,2-b:4,5-b']dithiophene (BDT)/2,1,3-benzothiadiazole (BT) copolymers. When dodecyl side chains (P1) are employed at the 4- and 8-positions of the BDT unit, we obtain a chloroform-soluble copolymer fraction with Mw of 6.3 kg/mol. Surprisingly, by moving to the commonly employed 2-ethylhexyl branch (P2), Mw decreases to 3.4 kg/mol. This is despite numerous reports that this side chain increases solubility and Mw. By moving the ethyl branch in one position relative to the polymer backbone (1-ethylhexyl, P3),Mw is dramatically increased to 68.8 kg/mol. As a result of this Mw increase, the shape of the absorption profile is dramatically altered, with λmax = 637 nm compared with 598 nm for P1 and 579 nm for P2. The hole mobility as determined by thin film transistor (TFT) measurements is improved from ∼ 1 × 10-6 cm²/Vs for P1 and P2 to 7 × 10-4 cm²/Vs for P3, while solar cell power conversion efficiency in increased to 2.91% for P3 relative to 0.31% and 0.19% for P1 and P2, respectively. [ABSTRACT FROM AUTHOR]

Published
2011
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25. Bis(μ-dithieno[3,2-b:2',3'-d]thio-phene-2,6-dicarboxyl-ato-κO:O)bis-[bis-(1,10-phenanthroline-κN,N')cobalt(II)] dimethyl-formamide disolvate.

Author

Macneill CM, Day CS, and Noftle RE

Abstract

The asymmetric unit of the title compound, [Co(2)(C(10)H(2)O(4)S(3))(2)(C(12)H(8)N(2))(4)]·2C(3)H(7)NO, contains one half of the formula unit, with the rest generated by inversion. The cobalt ion sits in a slightly distorted octa-hedral environment and is ligated to four N atoms of two 1,10-phenanthroline molecules and to two O atoms of two dithieno[3,2-b:2',3'-d]thio-phene-2,6-dicarb-oxy-l-ate anions. The anions act as bridges between the Co(II) centers.

Published
2009
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