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Reducing Trap‐Assisted Recombination in Small Organic Molecule‐Based Photovoltaics by the Addition of a Conjugated Block Copolymer
Macromolecular Rapid Communications ( IF 4.6 ) Pub Date : 2017-12-08 , DOI: 10.1002/marc.201700630
Kyuwan Cho 1 , Jinseck Kim 2 , So Yeon Yoon 1 , Ka Yeon Ryu 1 , Song-Rim Jang 2 , Bogyu Lim 2 , Kyungkon Kim 1
Affiliation  

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.

中文翻译:

通过添加共轭嵌段共聚物减少基于有机分子的小型光伏中陷阱辅助的复合

通过添加由二氟喹喔啉和噻吩并吡咯二酮嵌段组成的共轭嵌段共聚物(D130),大大改善了基于小分子有机半导体p-DTS(FBTTh 22的有机光伏(OPV)的性能。通过将5 wt%的D130添加到由p‐DTS(FBTTh)组成的光敏层中,基于p‐DTS(FBTTh 22的OPV的功率转换效率(PCE)从5.08%提高到6.75%。22和富勒烯衍生物。电流-电压和掠射入射角X射线散射分析表明,添加D130会大大降低器件的陷阱密度并改变p-DTS(FBTTh的堆积方向)22从大部分边缘到部分面对。这些变化极大地提高了OPV的电荷载流子迁移率,表明D130与p-DTS(FBTTh 22高度兼容。此外,添加D130可以通过减少1日光的浸泡强度下的老化损失来提高OPV的光稳定性。在轻度浸泡测试858小时后,基于D130的OPV保持了其初始PCE的34%。相比之下,不带D130的OPV的PCE在同一时间段内降低到其初始效率的14%。
更新日期:2017-12-08
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