Grain boundary solar container

This article provides a comprehensive review of the current understanding of grain boundaries in photovoltaic materials and their impact on solar cell performance. Polycrystalline materials are ubiquitous in technology, and grain boundaries have long been known to affect materials properties and performance. First principles materials modeling and electron microscopy methods are powerful and highly complementary for investigating the atomic scale structure. Sub-micrometer-resolved photocurrent mapping in operational perovskite solar cells, achieved through our home-built photoluminescence and photocurrent imaging microscopy, reveals enhanced photocurrent at grain boundaries compared to grain interiors. Local pump-probe femtosecond transient absorption. The efficiency of solar cells is significantly influenced by the microstructure of the material used, particularly the presence of grain boundaries. Grain boundaries are defects in the crystal structure that can either hinder or enhance the performance of solar cells, depending on their properties. Photoluminescence and photocurrent spectroscopies combined with diffraction-limited and sub- diffraction-limited spatial resolution are achieved via micro-photoluminescence (m-PL) and near-field microscopy (NSOM). These methods are used to examine the photo-response of individual grain boundaries. Abstract—The impact of grain boundaries on the performance of polycrsytalline photovoltaics remains an open question. We present a simplified description of dark grain boundary recom-bination current. The dark current takes the form of a diode equation, and the model provides closed form.