Recently, Dr. Liu Xin from the New Energy Materials and Devices Team at the College of Optoelectronic Engineering, Chengdu University of Information Technology, served as the corresponding author to publish a research paper titled "Effective surface passivation for stable and high-performance inverted CsPbI₂Br perovskite solar cells with efficiency over 15%" in the top-tier journal in the field of chemistry, Materials Today Chemistry (Impact Factor: 7.3), with our school as the first affiliated institution.  The undergraduate student of Class 2021 from the Department of Applied Physics at our college, Wang Lang, is the first author of the paper.

Solar cells based on lead-based halide perovskite materials (PSCs) represent the third generation of solar cells with great commercial application prospects. In recent years, inorganic perovskite materials, specifically cesium lead halide (CsPbX₃), have garnered widespread attention due to their exceptional thermal stability and outstanding photoelectric properties. However, inverted CsPbI₂Br PSCs suffer from low power conversion efficiency (PCE) primarily due to their relatively low open-circuit voltage (V_oc). In this study, thiophene halides with different side chains were employed as passivating agents, effectively passivating perovskite defects and reducing non-radiative recombination. This significantly enhanced the V_oc of the devices, ultimately leading to a PCE exceeding 15%. The research findings indicate that considering the influence of the passivating agent's side chains is crucial for minimizing defects in PSCs when designing these molecules. This work was generously supported by grants from the Sichuan Science and Technology Program, the Sichuan Undergraduate Innovation and Entrepreneurship Training Program, and the Information Materials and Device Applications Key Laboratory of Sichuan Provincial Universities.

Paper link: https://doi.org/10.1016/j.mtchem.2024.101980.