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

Author:

Ding Xiaoman12,Lv Jie134ORCID,Liang Zezhou5,Sun Xiaokang1,Zhao Jingjing6,Lu Manjia1,Wang Fei1,Zhang Chenyang1,Zhang Guangye7,Xu Tongle8,Hu Dingqin9,kan zhipeng6,Ruan Changshun34,Shi Yumeng10,Lin Haoran1,Zhang Wanqing2,Li Gang11,Hu Hanlin1ORCID

Affiliation:

1. Hoffmann Institute of Advanced Materials Shenzhen Polytechnic University 7098 Liuxian Boulevard Shenzhen 518055 China

2. School of Chemistry and Chemical Engineering Henan Institute of Science and Technology Xinxiang 453003 China

3. Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 China

4. University of Chinese Academy of Sciences Beijing 100049 P. R. China

5. Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi Key Lab of Photonic Technique for information School of Electronics science & Engineering Faculty of Electronic and Information Engineering Xi'an Jiaotong University Xi'an 710049 China

6. Center on Nanoenergy Research Guangxi Colleges and Universities Key Laboratory of Blue Energy and Systems Integration Carbon Peak and Neutrality Science and Technology Development Institute School of Physical Science & Technology Guangxi University Nanning 530004 China

7. College of New Materials and New Energies Shenzhen Technology University Shenzhen 518118 China

8. Shenzhen Key Laboratory of New Information Display and Storage Materials College of Materials Science and Engineering Shenzhen University Shenzhen 518060 China

9. School of Energy and Environment Department of Materials Science and Engineering, City University of Hong Kong Kowloon Tong Hong Kong 999077 China

10. Key Laboratory of Luminescence and Optical Information Ministry of Education Institute of Optoelectronic Technology Beijing Jiaotong University Beijing 100044 China

11. Department of Electronic and Information Engineering The Hong Kong Polytechnic University Hung Hum, Kowloon Hong Kong SAR 999077 China

Abstract

AbstractThe 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.

Funder

Science, Technology and Innovation Commission of Shenzhen Municipality

China Postdoctoral Science Foundation

Publisher

Wiley

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