Revealing Charge Carrier Mobility and Defect Densities in Metal Halide Perovskites via Space-Charge-Limited Current Measurements.
Revealing Charge Carrier Mobility and Defect Densities in Metal Halide Perovskites via Space-Charge-Limited Current Measurements.
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通过空间电荷限制电流测量揭示金属卤化物钙钛矿中的电荷载流子迁移率和缺陷密度。
DOI:
10.1021/acsenergylett.0c02599
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发表时间:
2021-03-12
影响因子:
22
通讯作者:
Koster LJA
中科院分区:
文献类型:
--
作者:
Le Corre VM;Duijnstee EA;El Tambouli O;Ball JM;Snaith HJ;Lim J;Koster LJA
Space-charge-limited current (SCLC) measurements have been widely used to study the charge carrier mobility and trap density in semiconductors. However, their applicability to metal halide perovskites is not straightforward, due to the mixed ionic and electronic nature of these materials. Here, we discuss the pitfalls of SCLC for perovskite semiconductors, and especially the effect of mobile ions. We show, using drift-diffusion (DD) simulations, that the ions strongly affect the measurement and that the usual analysis and interpretation of SCLC need to be refined. We highlight that the trap density and mobility cannot be directly quantified using classical methods. We discuss the advantages of pulsed SCLC for obtaining reliable data with minimal influence of the ionic motion. We then show that fitting the pulsed SCLC with DD modeling is a reliable method for extracting mobility, trap, and ion densities simultaneously. As a proof of concept, we obtain a trap density of 1.3 × 1013 cm–3, an ion density of 1.1 × 1013 cm–3, and a mobility of 13 cm2 V–1 s–1 for a MAPbBr3 single crystal.
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