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

Jen Wei Huang; Ming Seng Hsu; Tzu-Chin Lin

doi:10.1117/12.2060787

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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

Jen Wei Huang, Ming Seng Hsu, Tzu-Chin Lin

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Proceedings Volume 9200, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications VIII; 920019 (2014) https://doi.org/10.1117/12.2060787
Event: SPIE Optical Engineering + Applications, 2014, San Diego, California, United States

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 (λ_max) was near 800 nm. The optimal conversion efficiency (η_p) 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 η_p 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 η_p.

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Jen Wei Huang, Ming Seng Hsu, and 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); https://doi.org/10.1117/12.2060787

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