Abstract:

Developing an interplay between the local morphological character, optoelectronic properties and its local photovoltaic parameters in a perovskite thin film is essential for guiding the construction of highly-efficient perovskite solar cells (PSC). In this work, by using a laserscanned and time-resolved confocal microscopy coupled with a picoammeter detection module, we realize in-situ photoluminescence (PL) intensity, PL lifetime, and photocurrent mappings in a two-dimensional (2D) PSC. A significant negative correlation is found between photocurrent and PL intensity and PL lifetime imaging within grains of the perovskite polycrystalline film. We establish the correlation between local photovoltaic parameters, optoelectronic properties, and morphology character, which provides theoretical guidance for the optimization of PSC performance.

Key words: photocurrent mapping, 2D perovskite, solar cells, photoluminescence mapping