Optoelectronic Properties of Metal Halide Perovskite Single Crystal via Photoluminescence Quantum Efficiency
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Metal halide Perovskite materials have gained a great attention in the field of photovoltaics due to their excellent optoelectronic characteristics. These materials possess a numerous photovoltaic properties such as; solution processability, band gap tunability, long charge-carrier lifetime and high carrier mobilities. One of the most important photophysical parameters of perovskite is the photoluminescence quantum efficiency (PLQE), which is measured using an integrating sphere. PLQE measurements can be used to access the quality of materials, especially in perovskite solar cells where PLQE measurements could be used to evaluate the purity of perovskite materials and its impact on device performances. Therefore, in this study, we synthesized MAPbI3 single crystals by controlling the MAI and PbI2 contents to investigate how PbI2 affects perovskite single crystals quality using the optoelectronic measurements. Compared with the polycrystalline perovskite thin films, single crystal perovskites are without grain boundaries and also not limited by surface morphology issues and thus have a tremendous potential to produce stable and highly efficient photovoltaic devices. Additionally, single crystals can be grown to a large size, which is helpful for the accurate and reliable determination of their physical characteristics. Therefore, we extensively studied the growth and optoelectronic characteristics of perovskite single crystals through PLQE measurement, which is step forward towards the development of new applications in the fields of solar cells, light emitting diodes, and photodetectors.