Light- and Temperature-Modulated Magneto-Transport in Organic–Inorganic Lead Halide Perovskites,ACS Energy Letters

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Light- and Temperature-Modulated Magneto-Transport in Organic–Inorganic Lead Halide Perovskites
ACS Energy Letters ( IF 19.3 ) Pub Date : 2017-11-27 00:00:00 , DOI: 10.1021/acsenergylett.7b00941
Masoumeh Keshavarz ₁ , Steffen Wiedmann ₂ , Haifeng Yuan ₁ , Elke Debroye ₁ , Maarten Roeffaers ₃ , Johan Hofkens ₁

Affiliation

The optoelectronic properties and charge carrier dynamics in hybrid organic–inorganic perovskites under steady-state illumination are the key elements for understanding their high efficiency. We present temperature-dependent Hall and photoconductivity measurements down to a temperature of 4.2 K on single crystals of MAPbI₃ and MAPbBr₃ in magnetic fields up to 30 T and observed different transport regimes. For temperatures down to 25 K, charge transport is dominated by acoustic phonon scattering as inferred from the temperature dependence of both zero and high-field resistance. Below 25 K, transport is determined by thermally activated hopping of charge carriers reflected in a diverging zero-field resistance and a strong decrease in the carrier’s mobility and concentration. Our findings demonstrate the importance of performing experiments at low temperature to unravel the fundamental charge carrier dynamics and stimulate the need for a comprehensive theoretical model for perovskite-based devices.

中文翻译：

有机无机卤化钙钛矿中的光和温度调制的磁性传输。

稳态照明下有机-无机钙钛矿杂化体的光电性能和电荷载流子动力学是了解其高效性的关键因素。我们在MAPbI ₃和MAPbBr ₃单晶上提供了温度依赖性霍尔和光电导测量，测量温度低至4.2K。在高达30 T的磁场中观察到不同的传输方式。对于低至25 K的温度，电荷传输受声子声子散射的支配，这从零电阻和高场电阻的温度依赖性得出。低于25 K时，传输是由热激活的载流子跃迁所决定的，这反映在发散的零场电阻以及载流子迁移率和浓度的急剧下降中。我们的发现证明了在低温下进行实验的重要性，以阐明基本的载流子动力学并激发对基于钙钛矿的器件的全面理论模型的需求。

更新日期：2017-11-28

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