The remarkable discoveries of highly efficient solar cells from lead halide perovskites have led to feverish research activities on this class of hybrid organic-inorganic semiconductors. In this lecture, we will discuss unique physical properties of these materials that give rise to their exceptional solar cell performance. The same physical properties responsible for highly efficient solar cells are also ideal for the reverse process of light emission. Indeed, recent experiments in our laboratory (in collaboration with Song Jin of UW-Madison) have shown room temperature lasing from single crystal lead halide perovskite nanowires with the lowest lasing thresholds and highest quality factors reported to date for semiconductor nanowire lasers. Kinetic analysis based on time-resolved fluorescence reveals little charge carrier trapping in these single crystal nanowires and gives estimated lasing quantum yields approaching 100%, which represents orders of magnitude improvements over other nanowire lasers from conventional semiconductors. These findings suggest new design principles for novel semiconductors.

Perovskite fever: Absorbing and emitting light

251st National Meeting (2016)

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