Multifunctional Imidazolidinyl Urea Additive Initiated Complex with PbI2 Toward Efficient and Stable Perovskite Solar Cells

Author:

Tu Yibo1ORCID,Li Guodong1,Ye Jingchuan1,Deng Chunyan2,Liu Ruochuan1,Yang Gaoyuan1,Shao Tianxiang1,Li Yu3,Zang Yue1,Wang Yu1,Zhou Qin1,Wu Jihuai2,Yan Wensheng1

Affiliation:

1. Institute of Carbon Neutrality and New Energy School of Electronics and Information Hangzhou Dianzi University Hangzhou 310018 P. R. China

2. Engineering Research Center of Environment‐Friendly Functional Materials Ministry of Education Materials Science and Engineering College Huaqiao University Xiamen 361021 P. R. China

3. Information Engineering College Hangzhou Dianzi University Hangzhou 311300 P. R. China

Abstract

AbstractHigh‐quality perovskite absorption layer is the fundamental basis for efficient and stable perovskite solar cells (PSCs). Due to the ionic nature of perovskite components, plentiful charged defects and suspension bonds remain on the surface of perovskite grains after continuous high‐temperature annealing. Here, the complex initiated by the introduction of a multifunctional imidazolidinyl urea (IU) additive into the PbI2 precursor solution could serve as nucleation sites and crystallization templates for perovskite crystals to optimize the growth of high‐quality perovskite films. By anchoring at the grain boundaries of perovskite films, IU molecules could passivate various types of defects, improve the hydrophobic properties, and inhibit lead leakage. Attributed to reduced defect density, improved charge transport, and inhibited α‐FAPbI3 transition, the PSCs prepared based on IU additives achieved a champion power conversion efficiency of 23.18% (21.51% for the control PSCs) with negligible hysteresis and satisfactory stability.

Funder

National Key Research and Development Program of China

Fundamental Research Funds for the Provincial Universities of Zhejiang

Natural Science Foundation of Zhejiang Province

Publisher

Wiley

Subject

Biomaterials,Biotechnology,General Materials Science,General Chemistry

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