Thermal-assisted V-oc increase in an indenoindene-based non-fullerene solar system

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作   者：

Zulfiqar, Almas;  Zhang, Jianyun;  Khan, Ubaid;  Fan, Haijun;  Li, Baolin;  Zhu, Xiaozhang; 

作者机构：

Univ Chinese Acad Sci;  Beijing 100190;  Chinese Acad Sci;  Beijing Natl Lab Mol Sci;  Sch Chem Sci;  Beijing 100081;  Peoples R China;  Beijing Inst Technol;  Beijing 101408;  Inst Chem;  CAS Key Lab Organ Solids;  Sch Opt & Photon; 

关键词：

Small molecular acceptor;  Open-circuit voltage;  Indenoindene;  Non-fullerene; 

期刊名称：

Dyes and Pigments

i s s n：

0143-7208

年卷期：

2019 年 165 卷

页   码：

18-24

页   码：

摘   要：

An indenoindene-cored small molecule acceptor of 3-ethylrodanine terminals, IBR, was synthesized to achieve high open-circuit voltage (V-oc) solar cells. Adopting PBDB-T as the donor and IBR as the acceptor, the as-cast bulk-heterojunction non-fullerene solar cells show a promising V-oc of 0.88 V. After a thermal annealing process at 160 degrees C for 10 min, the PBDB-T:IBR solar cells exhibit an enhanced V-oc up to 1.16 V, among the highest V-oc value reported for single junction organic solar cells, with obtaining a power conversion efficiency of 6.66%. Detailed investigation indicates that this thermal-activated V-oc increase is caused by the microstructural rearrangement within polymer:IBR domains, which diminishes morphological defects, contributes to reduced bimolecular recombination and results in small saturation dark current density of the device. The work demonstrates the potential of IBR as efficient molecular acceptor for high V-oc devices of special applications on tandem or ternary solar cells.