Optimizing of Cathode Interface Layers in Organic Solar Cells Using Polyphenols: An Effective Approach

Xiaoman Ding, Jie Lv, Zezhou Liang, Xiaokang Sun, Jingjing Zhao, Manjia Lu, Fei Wang, Chenyang Zhang, Guangye Zhang, Tongle Xu, Dingqin Hu, zhipeng kan, Changshun Ruan, Yumeng Shi, Haoran Lin, Wanqing Zhang, Gang Li, Hanlin Hu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

The cathode interface layers (CILs) play a crucial role in enhancing the performance of organic solar cells (OSCs). However, challenges arise due to the high work function of CIL and inadequate contact with the active layer, leading to high interface trap recombination and poor charge extraction. In this study, a novel approach is proposed to improve charge injection and extraction in CILs by incorporating polyphenols, trihydroxybenzoic acid (TBA). Focusing on the CIL PDINN, its work function is successfully reduced from 4.14 eV to 3.80 eV and obtained charge collection efficiency of 91.23% through TBA regulation. These enhancements can be ascribed to improved contact between the active layer and the CILs, and enhanced the formation of a fine fiber phase width and inhibited interface recombination. As a result, the power conversion efficiency (PCE) of the binary OSCs comprising PM6: BTP-ec9 exhibits an increase from 18.2% to 19.3%, placing it among the one of the highest PCE values. Moreover, this approach demonstrated notable applicability for another CILs, as well as various OSCs systems. Overall, this research underscores the importance of regulating and modifying CILs to fully exploit their potential in OSCs devices, while laying the groundwork for optimizing their efficiency and stability.

Original languageEnglish
JournalAdvanced Energy Materials
DOIs
Publication statusPublished - 22 Jun 2024

Keywords

  • inhibited interface recombination
  • organic solar cells
  • regulation CIL
  • stability
  • TBA

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • General Materials Science

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