Passivation of degradation path enables high performance perovskite nanoplatelet lasers with high operational stability

Abstract

MAPbI 3 perovskite has attracted widespread interests for developing low-cost near infrared semiconductor gain media. However, it faces the instability issue under operation conditions, which remains a critical challenge. It is found that the instability of the MAPbI 3 nanoplatelet laser comes from the thermal-induced degradation progressing from the surface defects towards neighboring regions. By using PbI 2 passivation, the defect-initiated degradation is significantly suppressed and the nanoplatelet degrades in a layer-by-layer way, enabling the MAPbI 3 laser to sustain for 4500 s ( 2.7 × 10 7 pulses ), which is nearly three times longer than that of the nanoplatelet laser without passivation. Meanwhile, the PbI 2 passivated MAPbI 3 nanoplatelet laser with the nanoplatelet cavity displays a maximum quality factor up to ∼ 7800 , the highest reported for all MAPbI 3 nanoplatelet cavities. Furthermore, a high stability MAPbI 3 nanoplatelet laser that can last for 8500 s ( 5.1 × 10 7 pulses ) is demonstrated based on a dual passivation strategy, by retarding the defect-initiated degradation and surface-initiated degradation simultaneously. This work provides in-depth insights for understanding the operating degradation of perovskite lasers, and the dual passivation strategy paves the way for developing high stability near infrared semiconductor laser media.