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Controllable Acceleration and Deceleration of Charge Carrier Transport in Metal-Halide Perovskite Single-Crystal by Cs-Cation Induced Bandgap Engineering
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DOI：10.1002/smll.202107680.png)
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Abstract
En 中文
Charge carrier transport in materials is of essential importance for photovoltaic and photonic applications. Here, the authors demonstrate a controllable acceleration or deceleration of charge carrier transport in specially structured metal-alloy perovskite (MACs)PbI3 (MA= CH3NH3) single-crystals with a gradient composition of CsPbI3/(MA(1-)(x)Cs(x))PbI3/MAPbI(3). Depending on the Cs-cation distribution in the structure and therefore the energy band alignment, two different effects are demonstrated: i) significant acceleration of electron transport across the depth driven by the gradient band alignment and suppression of electron-hole recombination, benefiting for photovoltaic and detector applications; and ii) decelerated electron transport and thus improved radiative carrier recombination and emission efficiency, highly beneficial for light and display applications. At the same time, the top Cs-layer results in hole localization in the top layer and surface passivation. This controllable acceleration and deceleration of electron transport is critical for various applications in which efficient electron-hole separation and suppressed nonradiative electron-hole recombination is demanded.
Keywords:
acceleration of electron transport
bandgap gradients
metal-halide perovskites
surface passivation
time-resolved photoluminescence
Journal
IF:
12.1
Papers:
3.0W
Citations:
16.4W
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Cited Papers