Exploring alkylthiol additives in PBDB-T:ITIC blended active layers for solar cell applications

• 来源期刊: 中国物理B（英文版）
• 关键词: bulk heterojunction (BHJ) polymer/non-fullerene solar cells solvent additive morphology crystallization
• 年，卷（期）: 2019,（8）
• 页码范围: 425-432
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-1056/28/8/088802

摘要

Bulk heterojunction,non-fullerene PBDB-T:ITIC blend polymer solar cells have been fabricated.The active layers consisting of PBDB-T as a donor and ITIC as an acceptor are optimized using a series of alkylthiol additives (1,3-propanedithiol,1,4-butanedithiol,and 1,8-octanedithiol).It is found that the donor and acceptor are phase separated with different crystalline domains.The additives effectively re-organize the morphology and extend the molecule ordering in lamellar structure with increased correlation length in ITIC domain,benefiting the generation and dissociation of exciton and reducing charge recombination.A substantial improvement in power conversion efficiency of the devices from 8.13％ to 9.44％ is observed.This study shows that the application of alkylthiol additives is a simple and effective approach to improve the device performance in solar cells based on polymer/non-fullerene blend system.