摘要
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.
基金
Science and Technology Innovation Commission of Shenzhen(JCYJ20170811093453105,JCYJ20170818141519879)
Shenzhen Nanshan District Pilotage Team Program(LHTD20170006)
Natural Science Foundation of Guangdong Province(2018A030313401)
Platform and Base Special Project of Shanxi Province(201805D131012-3)
Henry Fok Education Foundation Young Teachers Fund
Key Research and Development(International Cooperation)Program of Shanxi Province(201803D421044)
Transformation Cultivation Project of University Scientific and Technological Achievements of Shanxi Province(2020CG013)
National Natural Science Foundation of China(61775156YC,61922060YC,61961136001ZH)。
