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Organic photovoltaic cells of fully conjugated poly[2,6- (4,4-bis(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b ]dithiophene)-alt-4,7-(2,1,3-benzothiadiazole)] doped with fullerene
Author(s): Jen Wei Huang; Ming Seng Hsu; Tzu-Chin Lin
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Paper Abstract

The fully conjugated poly[2,6-(4,4-bis(2-ethylhexyl)-4H-cyclopenta [2,1-b;3,4-b′] dithiophene)-alt-4,7-(2,1,3-benzothiadiazole)] (PCPDTBT) was a low energy gap (Eg) organic polymer material with polydispersity index (PDI) 1.3. It’s the highest occupied molecular orbital (HOMO) 5.2 eV, the lowest unoccupied molecular orbital (LUMO) 3.75 eV and Eg 1.45 eV. As compared with poly-(3-hexylthiophene) (P3HT), the lower Eg made the more absorption in the near-infrared (NIR) area. Its maximum absorption peak (λmax) was near 800 nm. The optimal conversion efficiency (ηp) of single-layered PCPDTBT:PC61BM organic photovoltaic (OPV) device reached 2.44% when the weight ratio of PCPDTBT:PC61BM was 1:2.5. In this study, we changed weight ratio, layer thickness, and solvent to enhance the optoelectronic properties of OPV devices. Variations the layer thickness were processed and investigated leading to an optimum ηp of 2.62 % for a single layer OPV cell with layer thickness of 150nm. The PCPDTBT molecule packed more order when the solvent evaporated to go slow. However, it did not increase the crystal level of PCPDTBT molecule for enhanced ηp.

Paper Details

Date Published: 5 September 2014
PDF: 12 pages
Proc. SPIE 9200, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications VIII, 920019 (5 September 2014); doi: 10.1117/12.2060787
Show Author Affiliations
Jen Wei Huang, R.O.C. Military Academy (Taiwan)
Ming Seng Hsu, R.O.C. Military Academy (Taiwan)
Tzu-Chin Lin, National Sun Yat-Sen Univ. (Taiwan)

Published in SPIE Proceedings Vol. 9200:
Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications VIII
Shizhuo Yin; Ruyan Guo, Editor(s)

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