Beyond perovskite solar cells: tellurium iodide as a promising light-absorbing material for solution-processed photovoltaic application

• Main Authors: Ahmed Ali Said, Xie, Jian, Zhao, Kexiang, Liu, Wenbo, Yu, Fei, Zhang, Qichun
• Other Authors: School of Materials Science and Engineering
• Format: Article
• Language: English
• Published: 2022
• Subjects: Engineering::Materials; Lead-Free Solar Cells; Beyond Perovskite Solar Cells
• Online Access: https://hdl.handle.net/10356/155215
• Institution: Nanyang Technological University

Searching new light-absorbing materials to replace toxic lead halide in solar cells is very important and highly desirable. In this research, we firstly demonstrated that tellurium iodide (TeI4 ) could be used as a light-absorbing material in solar cells due to its suitable optical band gap and the active lone-pair electron orbital in Te4+ . The best power conversion efficiency (PCE=3.56%) was achieved with a concentration of 0.9 M TeI4 in DMF:DMSO (4 : 1, v,v) without any heat treatment or antisolvent dripping. Our study indicates the promising potential of TeI4 for photovoltaic and optoelectronic applications.