Building a Charge Transfer Bridge between g-C3N4 and Perovskite with Molecular Engineering to Achieve Efficient Perovskite Solar Cells

Yingjie Wang; Jinhang Zou; Congyu Zhao; Haipeng Jiang; Yuhuan Song; Le Zhang; Xin Li; Fengyou Wang; Lin Fan; Xiaoyan Liu; Maobin Wei; Lili Yang

doi:10.1021/acsami.3c19475

Building a Charge Transfer Bridge between g-C₃N₄ and Perovskite with Molecular Engineering to Achieve Efficient Perovskite Solar Cells

ACS Appl Mater Interfaces. 2024 Mar 20;16(11):13815-13827. doi: 10.1021/acsami.3c19475. Epub 2024 Mar 5.

Authors

Yingjie Wang^{1

2}, Jinhang Zou², Congyu Zhao², Haipeng Jiang³, Yuhuan Song^{1

2}, Le Zhang^{1

2}, Xin Li^{1

2}, Fengyou Wang^{1

2}, Lin Fan^{1

2}, Xiaoyan Liu^{1

2}, Maobin Wei^{1

2}, Lili Yang^{1

2}

Affiliations

¹ Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun 130013, China.
² National Demonstration Center for Experimental Physics Education, Jilin Normal University, Siping 136000, China.
³ Institute for Advanced Materials, School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China.

PMID: 38442230
DOI: 10.1021/acsami.3c19475

Abstract

Effective defect passivation and efficient charge transfer within polycrystalline perovskite grains and corresponding boundaries are necessary to achieve highly efficient perovskite solar cells (PSCs). Herein, focusing on the boundary location of g-C₃N₄ during the crystallization modulation on perovskite, molecular engineering of 4-carboxyl-3-fluorophenylboronic acid (BF) on g-C₃N₄ was designed to obtain a novel additive named BFCN. With the help of the strong bonding ability of BF with both g-C₃N₄ and perovskite and favorable intramolecular charge transfer within BFCN, not only has the crystal quality of perovskite films been improved due to the effective defects passivation, but the charge transfer has also been greatly accelerated due to the formation of additional charge transfer channels on the grain boundaries. As a result, the champion BFCN-based PSCs achieve the highest photoelectric conversion efficiency (PCE) of 23.71% with good stability.

Keywords: additive engineering; charge transfer; g-C3N4 nanosheets; perovskite solar cells; photovoltaic performance.