Ternary Organic Solar Cells with Small Nonradiative Recombination Loss
- Authors
- Xie, Yuanpeng; Li, Tengfei; Guo, Jing; Bi, Pengqing; Xue, Xiaonan; Ryu, Hwa Sook; Cai, Yunhao; Min, Jie; Huo, Lijun; Hao, Xiaotao; Woo, Han Young; Zhan, Xiaowei; Sun, Yanming
- Issue Date
- 5월-2019
- Publisher
- AMER CHEMICAL SOC
- Citation
- ACS ENERGY LETTERS, v.4, no.5, pp.1196 - 1203
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS ENERGY LETTERS
- Volume
- 4
- Number
- 5
- Start Page
- 1196
- End Page
- 1203
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/65900
- DOI
- 10.1021/acsenergylett.9b00681
- ISSN
- 2380-8195
- Abstract
- Nonradiative recombination loss (q Delta V-oc(nonrad)) as a large component of energy loss (E-loss), has become an important factor that limits the power conversion efficiency (PCE) of organic solar cells (OSCs). Herein, high-performance ternary OSCs based on a polymer donor PTB7-Th, a polymer donor PBDTm-T1, and a nonfullerene acceptor FOIC are reported. When blended with FOIC, the PBDTm-T1-based device yielded a smallest q Delta V-oc(nonrad) of 0.197 eV, but with a moderate PCE of 3.3%. In contrast, the PTB7-Th:FOIC device exhibited a relatively higher q Delta V-oc(nonrad) of 0.329 eV; however, a high PCE of 11.9% was found. This trade-off relationship has been resolved using a ternary blend. By incorporation of 20% PBDTm-T1 into the PTB7-Th:FOIC blend, a small q Delta V-oc(nonrad) value of 0.271 eV and a significantly high PCE of 13.8% were simultaneously obtained. The results demonstrate that the nonradiative recombination loss can be effectively reduced by using a ternary strategy.
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