Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Bulk heterojunction structure organic solar cells (OSCs) have received very much attention because of their unique advantage of solution processability and mechanical flexibility. So far OSCs using a polymer donor and fullerene derivative acceptor have achieved power conversion efficiency (PCE) over 12%. It has been reported that number-average molecular weight (Mn) of polymers has great influence on OSCs’ performance, leading to batch-to-batch devices’ performance variations. In our previous report, we investigated the effects of Mn of our newly synthesized low bandgap polymer, PDTBT-TT, on OSCs’ performance. We found that OSCs based on higher Mn PDTBT-TT had higher PCE of 6.71% but the solubility of PDTBT-TT in o-dichlorobenzene decreased with increasing Mn thus leading to rougher active layer surface and higher series resistance. To overcome this problem, we further modified the chemical structure of PDTBT-TT to get a new copolymer, polymer 1. Polymer 1 and PDTBT-TT have similar Mn but polymer 1 has higher solubility because of larger dihedral angles. After applying polymer 1 into OSCs, the highest PCE of 7.45% was obtained from the optimized device. The open circuit voltage (Voc) of OSCs based on polymer 1 was 0.81 V while the Voc of OSCs based on PDTBT-TT was only 0.70 V. These findings are helpful for designing new high- performance polymers for OSCs.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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