Contactless and Spatially Resolved Determination of Current−Voltage Curves in Perovskite Solar Cells via Photoluminescence
Anh Dinh Bui, Md Arafat Mahmud, Naeimeh Mozaffari, Rabin Basnet, The Duong, Gabriel Bartholazzi, Tien T. Le, Thien N. Truong, Mike Tebyetekerwa, Ary Anggara Wibowo, Klaus Weber, Thomas P. White, Kylie Catchpole, Daniel Macdonald, Hieu T. Nguyen
Abstract
Early prediction of spatially resolved performance of perovskite solar cells (PSCs) is essential for process monitoring, control and fault diagnosis, and upscaling of this emerging technology. Herein, a fast, nonde structive, contactless imaging‐based approach is developed to visualize the spatial distribution of possible light current density−voltage (pseudo‐ J−V ) curves on finished and partly finished cells. This allows for the extraction of other critical spatially resolved properties including implied open‐circuit voltage and pseudo‐fill factor. The technique is applied to systematically investigate various degradation behaviors on PSCs including thermal stability, light soaking, and ambient air exposure. Finally, it is used to predict pseudo‐ J−V curves of various perovskite films with different compositions. These results demonstrate the significant value of this fast imaging technique for the research and development of PSCs ranging from material selection, process optimization, to degradation study.