Enhanced performance of perovskite solar cells via laser-induced heat treatment on perovskite film

We fabricated perovskite solar cells (PSCs) using laser-induced heat treatment. Perovskite films were prepared on substrates using the two-step solution deposition method. Subsequently, a pulsed laser source was illuminated to the perovskite film to stimulate the growth of perovskite crystals, which enhanced the power conversion efficiency (PCE) of the PSCs. The laser operation parameters, such as the defocusing distance and scan speed, were investigated to control the grain size of the perovskite. Based on optimized laser operation parameters, the best and average PCEs of 13.03% and 12.45 +/- 0.28%, respectively, were achieved, which are higher than those obtained with conventional thermal heating (the best and average PCEs of 11.43% and 10.98 +/- 0.25%, respectively). A perovskite layer temperature of 115 degrees C was predicted by simulating the energy absorption of the perovskite film under optimized laser operation conditions using COMSOL software.