Multifunctional Reductive Molecular Modulator toward Efficient and Stable Perovskite Solar Cells

Li M, Gao D, Zhang B, Xu S, Zhuang X, Wang C, Yang L, Ma X, Zheng S, Song H, Chen J, Chen C (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Solar RRL Wiley-VCH

DOI: 10.1002/solr.202100320

Abstract

The defects (e.g., I2, anion, and cation vacancies) in the perovskite films are detrimental to the power conversion efficiency (PCE) and stability of perovskite solar cells (PSCs). Herein, a multifunctional additive molecule 4-fluorophenylhydrazine hydrochloride (denoted as 4F-PHCl) is reported, which can improve perovskite crystallization, passivate film defects, and enhance film moisture stability, finally leading to the simultaneous increase in PCE and stability. It is revealed that the hydrazine functional group can effectively reduce the I2 defects back to I-. In addition, the hydrazinium contained cations and chloride anions can passivate the cationic defects (like anion vacancies) and anionic defects (like cation vacancies), respectively. The hydrophobic fluorinated benzene ring should be mainly responsible for the enhanced moisture stability of films and devices. As a result, the 4F-PHCl-modified device achieves a promising efficiency of 21.80% along with a high open-circuit voltage of 1172 mV and exhibits excellent long-term ambient stability. A guide for developing multifunctional additive molecules for the simultaneous enhancement of efficiency and stability is provided.

Involved external institutions

Hebei University of Technology (HEBUT) / 河北工业大学 CN China (CN) Jilin University (JLU) / 吉林大学 CN China (CN) Chongqing Medical University CN China (CN) Dalian Maritime University / 大连海事大学 CN China (CN)

How to cite

APA:

Li, M., Gao, D., Zhang, B., Xu, S., Zhuang, X., Wang, C.,... Chen, C. (2021). Multifunctional Reductive Molecular Modulator toward Efficient and Stable Perovskite Solar Cells. Solar RRL. https://dx.doi.org/10.1002/solr.202100320

MLA:

Li, Mengjia, et al. "Multifunctional Reductive Molecular Modulator toward Efficient and Stable Perovskite Solar Cells." Solar RRL (2021).

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