Enhanced control of self-doping in halide perovskites for improved thermoelectric performance.,Nature Communications

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Enhanced control of self-doping in halide perovskites for improved thermoelectric performance.
Nature Communications ( IF 14.7 ) Pub Date : 2019-12-17 , DOI: 10.1038/s41467-019-13773-3
Tianjun Liu _{1,

2} , Xiaoming Zhao ₂ , Jianwei Li ₃ , Zilu Liu ₃ , Fabiola Liscio ₄ , Silvia Milita ₄ , Bob C Schroeder ₃ , Oliver Fenwick _{1,

2}

Affiliation

Metal halide perovskites have emerged as promising photovoltaic materials, but, despite ultralow thermal conductivity, progress on developing them for thermoelectrics has been limited. Here, we report the thermoelectric properties of all-inorganic tin based perovskites with enhanced air stability. Fine tuning the thermoelectric properties of the films is achieved by self-doping through the oxidation of tin (ΙΙ) to tin (ΙV) in a thin surface-layer that transfers charge to the bulk. This separates the doping defects from the transport region, enabling enhanced electrical conductivity. We show that this arises due to a chlorine-rich surface layer that acts simultaneously as the source of free charges and a sacrificial layer protecting the bulk from oxidation. Moreover, we achieve a figure-of-merit (ZT) of 0.14 ± 0.01 when chlorine-doping and degree of the oxidation are optimised in tandem.

中文翻译：

增强对卤化物钙钛矿中自掺杂的控制，以改善热电性能。

金属卤化物钙钛矿已经成为有前途的光伏材料，但是，尽管导热系数超低，但是将其开发用于热电学的进展仍然受到限制。在这里，我们报告了具有增强的空气稳定性的全无机锡基钙钛矿的热电性能。通过在薄表面层中将锡（III）氧化为锡（IV）进行自掺杂，可以实现薄膜的热电性能的微调，从而将电荷转移至主体。这将掺杂缺陷与传输区分开，从而实现了增强的导电性。我们表明，这是由于富含氯的表面层（同时充当自由电荷的来源）和保护层免受氧化的牺牲层而产生的。此外，我们获得的品质因数（ZT）为0.14±0。

更新日期：2019-12-18

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