Reduced Defects and Enhanced Performance of (FAPbI3)0.97(MAPbBr3)0.03-Based Perovskite Solar Cells by Trimesic Acid Additives

Hoang V Quy; Dang H Truyen; Sangmo Kim; Chung W Bark

doi:10.1021/acsomega.1c01909

Reduced Defects and Enhanced Performance of (FAPbI₃)_0.97(MAPbBr₃)_0.03-Based Perovskite Solar Cells by Trimesic Acid Additives

ACS Omega. 2021 Jun 10;6(24):16151-16158. doi: 10.1021/acsomega.1c01909. eCollection 2021 Jun 22.

Authors

Hoang V Quy¹, Dang H Truyen¹, Sangmo Kim², Chung W Bark¹

Affiliations

¹ Department of Electrical Engineering, Gachon University, 13120 Seongnam, Korea.
² School of Intelligent Mechatronics Engineering, Sejong University, 05006 Seoul, Korea.

Abstract

A high-quality organolead trihalide perovskite film with large-sized crystalline grains and smooth surfaces is required to obtain efficient perovskite solar cells (PSCs). Herein, high-quality (FAPbI₃)_0.97(MAPbBr₃)_0.03 perovskite films were fabricated using trimesic acid (TMA) additives in a halide perovskite precursor solution to obtain efficient PSCs. The X-ray diffraction analysis and scanning electron microscopy of the films revealed that the TMA had a significant effect on the roughness of the films by acting as a surface link, thus reducing the surface defects and recombination at the grain boundaries. In addition, with the addition of the TMA additive, a smooth perovskite film with a flat surface and no pinholes was obtained. The perovskite film was used to fabricate a PSC device, and the device exhibited a high power conversion efficiency of 17.26%, which was higher than that of the control device (15.15%) under the same conditions. This study demonstrates a facile method to passivate defects on the perovskite layer via surface modification.