Reducing Trap-Assisted Recombination in Small Organic Molecule-Based Photovoltaics by the Addition of a Conjugated Block Copolymer
- 주제(키워드) organic solar cells , organic solar cell stability , small molecule organic solar cells , ternary organic solar cells
- 주제(기타) Polymer Science
- 설명문(일반) [Cho, Kyuwan; Yoon, So Yeon; Ryu, Ka Yeon; Kim, Kyungkon] Ewha Womans Univ, Dept Chem & Nano Sci, Seoul 120750, South Korea; [Kim, Jinseck; Jang, Song-Rim; Lim, Bogyu] LG Chem R&D Campus Daejeon, Future Technol Res Ctr, Corp R&D, 188 Moonji Ro, Daejeon 34122, South Korea
- 등재 SCIE, SCOPUS
- 발행기관 WILEY-V C H VERLAG GMBH
- 발행년도 2018
- URI http://www.dcollection.net/handler/ewha/000000151758
- 본문언어 영어
- Published As http://dx.doi.org/10.1002/marc.201700630
초록/요약
The performance of organic photovoltaics (OPVs) based on the small-molecule organic semiconductor p-DTS(FBTTh2)(2) is greatly improved by the addition of a conjugated block copolymer composed of difluoroquinoxaline and thienopyrrolodione blocks (D130). The power conversion efficiency (PCE) of the p-DTS(FBTTh2)(2)-based OPV is improved from 5.08% to 6.75% by the addition of 5 wt% D130 to the photoactive layer, which is composed of p-DTS(FBTTh2)(2) and a fullerene derivative. Current-voltage and grazing incidence wide-angle X-ray scattering analyses revealed that the addition of D130 significantly reduces the trap density of the device and changes the packing orientation of p-DTS(FBTTh2)(2) from mostly edge-on to partially face-on. These changes greatly improve the charge carrier mobility of the OPV, indicating that D130 is highly compatible with p-DTS(FBTTh2)(2). Furthermore, the addition of D130 improve the photostability of the OPV by reducing the burn-in loss under a light soaking intensity of 1 sun. The D130-based OPV maintained 34% of its initial PCE after a light soaking test for 858 h. In contrast, the PCE of the OPV without D130 reduced to 14% of its initial efficiency in the same time period.
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