High-efficiency lead-free wide band gap perovskite solar cells via guanidinium bromide incorporation
Mengmeng Chen, Muhammad Akmal Kamarudin, Ajay K. Baranwal, Gaurav Kapil, Teresa S. Ripolles, Kohei Nishimura, Daisuke Hirotani, Shahrir Razey Sahamir, Zheng Zhang, Chao Ding, Yoshitaka Sanehira, Juan Bisquert, Qing Shen, and Shuzi Hayase
ACS Applied Energy Materials 2021 4 (6), 5615-5624
In this paper the researchers explore the fabrication of the wide band gap (1.61 eV) ASnI2Br perovskite solar cells through the optimization of formamidinium and guanidinium content to improve the efficiency from 1.68 to 7.00%. This work provides proof that tin-halide perovskite solar cells have the potential in the fabrication of lead-free all-perovskite tandem solar cells.
The researchers used Paios to perform, under light, intensity-modulated photocurrent spectroscopy (IMPS) and intensity-modulated photovoltage spectroscopy (IMVS).