Issue 5, 2020

Formamidine-assisted fast crystallization to fabricate formamidinium-based perovskite films for high-efficiency and stable solar cells

Abstract

In the past decade, perovskite solar cells (PSCs) have experienced a rapid development with the goal of achieving both high efficiency and high stability. Avoiding the use of unstable methylammonium, formamidinium-based perovskites, with better thermal stability and lower band gap, have became promising candidate absorbers. However, the methylammonium-free PSCs usually show inferior PCEs, which is closely related to the crystalline quality of these perovskites. In this study, we propose a formamidine-assisted fast crystallization (FAAFC) method to regulate the nucleation and improve the crystallization by using an FA-containing chlorobenzene antisolvent. It was found that RbCsFAPbI3 films prepared using the FAAFC method have a preferred orientation, larger crystal size and less grain boundary and traps. As a result, their inverted PSCs exhibit much better photovoltaic performance and stability compared to with the control method, achieving a PCE of 20.58% and <10% degradation after 500 h illumination.

Graphical abstract: Formamidine-assisted fast crystallization to fabricate formamidinium-based perovskite films for high-efficiency and stable solar cells

Supplementary files

Article information

Article type
Paper
Submitted
06 Oct 2019
Accepted
18 Dec 2019
First published
19 Dec 2019

J. Mater. Chem. C, 2020,8, 1642-1648

Formamidine-assisted fast crystallization to fabricate formamidinium-based perovskite films for high-efficiency and stable solar cells

S. Zhang, S. Wu, R. Chen, W. Chen, Y. Huang, Z. Yang and W. Chen, J. Mater. Chem. C, 2020, 8, 1642 DOI: 10.1039/C9TC05465K

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