Nanoscopic Observation of Organometal Halide Perovskites with Superlattice
Satoshi Uchida a, Hiroshi Segawa a
a The University of Tokyo, 日本、〒153-0041 東京都目黒区駒場4丁目6−1 3号館南棟, 目黒区, Japan
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP24)
Tokyo, Japan, 2024 January 21st - 23rd
Organizers: Qing Shen and James Ryan
Invited Speaker Session, Satoshi Uchida, presentation 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.

We use our own and third party cookies for analysing and measuring usage of our website to improve our services. If you continue browsing, we consider accepting its use. You can check our Cookies Policy in which you will also find how to configure your web browser for the use of cookies. More info