期刊
NATURE PHOTONICS
卷 11, 期 12, 页码 784-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41566-017-0047-6
关键词
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资金
- Air Force Office of Scientific Research [FA-9550-14-1-0301]
- National Science Foundation [DMR-1654077]
- DARPA Young Faculty Award [D15AP00093]
- ONR [N00014-17-1-2005]
Hybrid organic-inorganic perovskites have emerged as promising gain media for tunable, solution-processed semiconductor lasers. However, continuous-wave operation has not been achieved so far(1-3). Here, we demonstrate that optically pumped continuous-wave lasing can be sustained above threshold excitation intensities of similar to 17 kW cm(-2) for over an hour in methylammonium lead iodide (MAPbI(3)) distributed feedback lasers that are maintained below the MAPbI(3) tetragonalto-orthorhombic phase transition temperature of T approximate to 160 K. In contrast with the lasing death phenomenon that occurs for pure tetragonal-phase MAPbI(3) at T > 160 K ( ref. (4)), we find that continuous-wave gain becomes possible at T approximate to 100 K from tetragonal-phase inclusions that are photogenerated by the pump within the normally existing, larger-bandgap orthorhombic host matrix. In this mixed-phase system, the tetragonal inclusions function as carrier recombination sinks that reduce the transparency threshold, in loose analogy to inorganic semiconductor quantum wells, and may serve as a model for engineering improved perovskite gain media.
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