Abstract
Perovskite photovoltaic cells have seen a remarkable rise in power conversion efficiencies over a period of only a few years. Much of this performance is underpinned by the favorable charge-carrier mobilities in metal halide perovskites (MHPs), which are remarkably high for materials with such facile and versatile processing routes. This Perspective outlines the mechanisms that set a fundamental upper limit to charge-carrier mobility values in MHPs and reveals how they may be tuned through changes in stoichiometry. In addition, extrinsic effects such as grain size, energetic disorder, and self-doping are discussed for specific MHPs in the context of remedies designed to avoid them.
Highlights
Perovskite photovoltaic cells have seen a remarkable rise in power conversion efficiencies over a period of only a few years
A marked improvement was reported for FAPbI3 thin films,[43] with Stokes shifts reduced to 60 meV, and charge-carrier mobilities as high as 22 cm2/(V s), sufficient to allow fabrication of planarheterojunction photovoltaic devices.[14]
Experimental and theoretical evidence suggests that room-temperature charge-carrier mobilities in metal halide perovskites (MHPs) are fundamentally limited by Fröhlich interactions between charge carriers and the electric fields associated with longitudinal optical (LO) phonon modes of the ionic lattice
Summary
Perovskite photovoltaic cells have seen a remarkable rise in power conversion efficiencies over a period of only a few years.
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