Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session P20: Recent Advances in Solar Photovoltaics
2:30 PM–5:30 PM,
Wednesday, March 7, 2018
LACC Room: 308B
Sponsoring Units: GERA FIAP
Chair: Harry Atwater, Caltech
Abstract: P20.00009 : Morphology and device physics of ternary polymer solar cells with power conversion efficiencies over 11%.*
4:30 PM–4:42 PM
Fabricating ternary solar cells (TSCs) is a promising strategy to improve the device efficiency of organic photovoltaics without introducing sophisticated processing procedures. We report high efficiency TSCs with PCEs over 11% in a few polymer solar cell systems. We demonstrate contrasting effects of two crystallizable polymers in determining efficiency improvements in PTB7-Th:PC71BM host blends when they are added in. Whilst negligible charge transfer was determined in binary blends of each polymer mixture, effective energy transfer was identified from PffBT4T-2OD to PTB7-Th that contributes to an improvement in ternary device efficiency. In contrast, energy transfer from PTB7-Th to PDPP2TBT worsened the device efficiency. In another ternary system, the thrid component PCDTBT8 was found locating at the donor/acceptor interface without disrupting the crystallization of PffBT4T-2OD to maintain decent charge mobility, and loosens the fullerene networks to facilitate exciton dissociation. Device physics studies support that the additive can enhance the built-in voltage and suppress the trap-assisted charge recombination, leading to improved FF and VOC to boost efficiency.
*This work is supported by the National Natural Science Foundation of China (Grants No. 21774097, 21504065).
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