Abstract
Abstract
Highlights
Lead and tin halide perovskites have recently been shown to exhibit impressive performance in a range of optoelectronic applications ranging from photovoltaics to radiation detection to lasing, but are unusual in several respects relative to conventional semiconductors
The electronic configuration of Pb (Sn) in halide perovskites––with a 6s2 (5s2) lone pair––imparts several unusual properties to these compounds, many of which are favorable for their optoelectronic applications
The antibonding nature of states at the valence band (VB) edge may contribute to the defect tolerance of these materials and produces a large positive bandgap temperature coefficient
Summary
Lead and tin halide perovskites have recently been shown to exhibit impressive performance in a range of optoelectronic applications ranging from photovoltaics to radiation detection to lasing, but are unusual in several respects relative to conventional semiconductors. These materials can be prepared under mild conditions from modest purity precursors, and yet they are highly crystalline and exhibit sharp optical absorption onsets. The lattice dynamical impacts are profound, with the lone pairs leading to substantially elevated lattice polarizability
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