Simultaneous Improvement of Efficiency and Stability of Non-Fullerene-Based Organic Solar Cells Via Sequential Deposition of Single Donor and Binary Acceptor
- 주제(키워드) burn-in , non-fullerene acceptors , organic solar cells , sequential deposition , stability
- 주제(기타) Energy & Fuels; Materials Science, Multidisciplinary
- 설명문(일반) [Min, Suhyun; Han, Seung Hee; Park, Chanju; Ryu, Ka Yeon; Kim, Kyungkon] Ewha Womans Univ, Dept Chem & Nanosci, Seoul 03760, South Korea
- 등재 SCIE, SCOPUS
- 발행기관 WILEY-V C H VERLAG GMBH
- 발행년도 2021
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000183515
- 본문언어 영어
- Published As http://dx.doi.org/10.1002/solr.202100592
초록/요약
Non-fullerene acceptor (NFA)-based organic solar cells often exhibit significant cell degradation in power conversion efficiency (PCE) in the early stages of operation, called "burn-in." Generally, to fabricate NFA-based solar cells, binary blend solution deposition (binary BSD) of a conjugated polymer and an NFA is utilized. Herein, the reasons for burn-in are investigated by aging organic photovoltaic cells with independent control of temperature and light. The results reveal that burn-in is mainly due to a rapid increase in the interfacial resistance (R (int)) rather than photo-oxidation of the components or oxidation of the electrode. This R-int is effectively suppressed by constructing a ternary photoactive layer through the sequential deposition of a polymer solution and a binary acceptor solution consisting of an NFA and a fullerene acceptor (ternary sequential deposition [ternary SqD]). Under the illumination of 1 sun and thermal annealing at 80 degrees C for 500 h, the binary BSD exhibits a reduction in efficiency of 63% and 59%, respectively, whereas the ternary SqD demonstrates a reduction of only 32% and 35%, respectively. In addition, the ternary SqD improves the PCE on using fullerene acceptors to enhance light harvesting at short wavelengths.
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