Proceedings of International online conference on Hybrid materials and optoelectronic devices (HYBRIDOE)
DOI: https://doi.org/10.29363/nanoge.hybridoe.2020.022
Publication date: 4th December 2020
Single-crystalline perovskites are ideal candidates for lasing and other optoelectronic applications. Although significant efforts have been made to grow both bulk single-crystalline perovskites in liquid solution, their dimensions are still too large to make nanoscale whispering-gallery-mode (WGM) resonator based lasers that possess high quality (Q) factor and small volume. Here, we fabricate atomically smooth triangular PbI2 templates on a mica substrate by the vapor phase deposition method and convert them to atomically smooth perovskites which have regular and unwrinkled facets with average surface roughness less than 2 nm. By using a CH3NH3PbI3 nanoplatelet with a side length of 27 um and thickness of 80 nm, we demonstrated room temperature WGM lasing with a Q up to 2600. By passivating the nanoplatelets with PbI2, we improved the quality factor of laser up to ~7500 and reduced the lasing threshold down to 15uJ/cm2. The laser can work stably as long as 4500 s. After By passivating the nanoplatelets with DBP, the laser can work stably as long 11000 s. In addition, the volume of the WGM mode is reduced significantly in comparison with the prior reports. The realized high-quality triangular CH3NH3PbI3 perovskite nanoplatelets with high Q-factor and small volume are expected to perform as ideal cavities for long pulse durations lasers and would find potential applications in integrated optoelectronic devices.
We are grateful for support from the National Natural Science Foundation of China (61922060, 61775156, 61905173, U1710115, U1710115, and U1810204). YC also acknowledges support from the Natural Science Foundation of Shanxi Province (201801D221029), the Key Research and Development (International Cooperation) Program of Shanxi Province (201803D421044), the Henry Fok Education Foundation Young Teachers Fund, the Young Sanjin Scholars Program, and the Platform and Base Special Project of Shanxi Province (201805D131012-3).
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