Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP24)
DOI: https://doi.org/10.29363/nanoge.iperop.2024.107
Publication date: 18th October 2023
To develop a highly efficient solar cell using organometal halide perovskites, precise control over its micro-scale structure emerges as a critical factor. This is because the existence of macrostructural boundaries within the organometal halide perovskite proves detrimental to the flow of charge carriers, thereby compromising device performance.
In our investigation, we utilized transmission electron microscopy (TEM) analysis to confirm the presence of a tetragonal/cubic superlattice within the grain of a methyl ammonium iodide (MAPbI3, where MA = CH3NH3) perovskite. Our findings revealed that the nano-sized domains hinder charge carrier flow in the MAPbI3 perovskite. To mitigate the adverse effects of these nano-sized domains, we introduced 5% potassium, aiming to reduce the junction domain and tried to enhance the cubic phase proportion through macrostructural phase control using liquid nitrogen.
Through meticulous micro-structural phase control of the MAPbI3 perovskite, we successfully reduced grain boundaries and minimized physical gaps. This resulted in a noteworthy achievement, as we attained a power conversion efficiency (PCE) of 20.23% with a single cation MAPbI3 perovskite solar cell.