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Achchige, Dumindu Thanaweera
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article
Crystallography-derived optoelectronic and photovoltaic properties of CsPbBr3 perovskite single crystals as revealed by in situ transmission electron microscopy
Abstract
Given the high importance of CsPbBr3 perovskite crystals for optoelectronic and photovoltaic device applications, surprisingly, relatively little work has been done to assess the impact of crystalline orientations and/or surface contacts on their performance. Herein, photocurrent and photovoltage properties of CsPbBr3 single crystals are selectively measured on (001) and (101) facets in pristine and compressed conditions using light-and-stress-compatible in situ high-resolution transmission electron microscopy (TEM). The photocurrent-to-dark-current ratios on (001) and (101) facets are found to be comparable, showing a minimal statistical discrepancy. The TEM-derived photocurrent spectroscopies revealed slight blue shifts of the cut-off wavelengths under crystal pressing. By contrast, the photovoltage values measured on the two regarded facets significantly differ, and this difference is sustained under in situ compression in the TEM. The higher values apparent for (101) facets provide valuable information for a smart device design and perovskite crystal applications in photoelectronic and photovoltaic fields.