Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.017
Publication date: 18th July 2019
Crystalline perovskite materials are promising materials for X-ray and photon detection due to their superior optoelectronic properties. Particularly, single-crystal perovskites have drawn a lot attention recently due to their substantially low crystal defects, which contribute to improving the figures of merit of the devices. However, cuboid CH3NH3PbI3 SGC with the naturally favorable geometry for device fabrication is rarely reported in X-ray and photon detection application. In this work, we propose the concept of seed dissolution-regrowth (SDR) to improve crystal quality of cuboid CH3NH3PbI3 SGC and provide fundamental understanding of the nucleation and growth thermodynamically [1]. Our results show that the approach improves crystal quality by improving the structural matching between the seed and the subsequently deposited crystal to lower the required Gibbs free energy for nucleation. c-MAPbI3 synthesized with SDR had a long carrier lifetime of 497 ns, and its X-ray detector yielded a sensitivity of 968.9 μC/Gy/cm2 under -1 V bias, higher than that of MAPbBr3 SGCs counterpart. This is the first report of c-MAPbI3 SGCs application in X-ray detection with the promising sensitivity. By comparing the X-ray and photon detection performances of c- and d-MAPbI3 SGCs, we found that c-MAPbI3 performs better than d-MAPbI3 due to its conducive preferred crystal orientation for charge carrier diffusion and collection originated from the high quality of c-MAPbI3 SGCs by SDR. Overall, our work paves the way to synthesize high-quality perovskite SGCs and demonstrate the advantages of MAPbI3 SGCs with preferred crystal orientation for device applications.
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