Control of vertical phase separation in high performance non-fullerene organic solar cell by introducing oscillating stratification preprocessing

• 作者: Dayong Zhang Pu Fan Jinyu Shi Yifan Zheng Jian Zhong Junsheng Yu
• 来源期刊: 纳米研究（英文版）
• 年，卷（期）: 2021,（5）
• 所属期刊栏目: Research Articles
• 页码范围: 1319-1325
• 页数: 7页
• 语种: 英文

摘要

Non-fullerene organic solar cell (NFOSC) has attracted tremendous attention due to their great potential for commercial applications.To improve its power conversion efficiency (PCE),generally,sequential solution deposition (SSD) methods have been employed to construct the graded vertical phase separation (VPS) of the bulk-heterojunction (BHJ) active layer for efficient exciton separation and charge transition.However,a variety of orthogonal solvents used in the SSD may lead to the unpredicted change in the BHJ morphology and introduce additional defects inside the BHJ bulk thus complicate the fabrication process.Here,a simple oscillating stratification preprocessing (OSP) is developed to facilitate the formation of graded VPS among the BHJ layer.As a result,a significant improvement is obtained in PCE from 10.96％ to 12.03％,which is the highest value reported among PBDB-T:ITIC based NFOSC.