Ferroelectric Polymer Drives Performance Enhancement of Non‐fullerene Organic Solar Cells. Issue 25 (21st April 2022)

• Record Type: Journal Article
• Authors: Deng, Jiawei; Huang, Bin; Li, Wenhao; Zhang, Lifu; Jeong, Sang Young; Huang, Shaorong; Zhang, Shijing; Wu, Feiyan; Xu, Xiaoli; Zou, Guifu; Woo, Han Young; Chen, Yiwang; Chen, Lie
• Is Part Of: Angewandte Chemie international edition. Volume 61:Issue 25(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-04-21
• Subjects: Ferroelectric Polymer -- Non-Fullerene -- Organic Electronics -- Solar Cells; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.202202177
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Enhancing the built‐in electric field to promote charge dynamitic process is of great significance to boost the performance of the non‐fullerene organic solar cells (OSCs), which has rarely been concerned. In this work, we introduced a cheap ferroelectric polymer as an additive into the active layers of non‐fullerene OSCs to improve the device performance. An additional and permanent electrical field was produced by the polarization of the ferroelectric dipoles, which can substantially enhance the built‐in electric field. The promoted exciton separation, significantly accelerated charge transport, reduced the charge recombination, as well as the optimized film morphology were observed in the device, leading to a significantly improved performance of the PVDF‐modified OSCs with various active layers, such as PM6 : Y6, PM6 : BTP‐eC9, PM6 : IT‐4F and PTB7‐Th : Y6. Especially, a record efficiency of 17.72 % for PM6 : Y6‐based OSC and an outstanding efficiency of 18.17 % for PM6 : BTP‐eC9‐based OSC were achieved. Abstract : Addition of ferroelectric polymer polyvinylidene difluoride (PVDF) as additive into non‐fullerene organic solar cells substantially enhances the built‐in electric field. Promoted exciton separation, significantly accelerated charge transport, reduced charge recombination, as well as optimized film morphology were observed in the device, leading to a significantly improved device performance.