5 September 2014 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
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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.
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Jen Wei Huang, Ming Seng Hsu, Tzu-Chin Lin, "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", 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; https://doi.org/10.1117/12.2060787
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