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arXiv 2403.09016cond-mat.mtrl-sci
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通过阴离子交换实现带隙可调的硫族化物钙钛矿合金的制备路线

A Processing Route to Chalcogenide Perovskites Alloys with Tunable Band Gap via Anion Exchange

Kevin Ye, Ida Sadeghi, Michael Xu, Jack Van Sambeek, Tao Cai, Jessica Dong, Rishabh Kothari, James M. LeBeau, R. Jaramillo

AI总结:

通过硒化BaZrS3薄膜实现阴离子交换,制备带隙可调(1.5-1.9 eV)的硫族化物钙钛矿合金,其光电导响应增强100倍且缺陷密度更低,有望推动钙钛矿太阳能电池发展。

摘要:

我们展示了通过将BaZrS3薄膜硒化来合成BaZr(S,Se)3硫族化物钙钛矿合金的方法。阴离子交换过程在不改变正交晶系钙钛矿晶体结构或薄膜微观结构的情况下,产生了具有可调组成和带隙的薄膜。直接带隙可在1.5至1.9电子伏特之间调节。与直接生长制备的合金薄膜相比,以这种方式制备的合金薄膜具有强100倍的光电导响应和更低的扩展缺陷密度。在高硒含量薄膜中,无论有无外延,钙钛矿结构都是稳定的。在H2Se气体中进行硒化的制造兼容工艺可能推动硫族化物钙钛矿太阳能电池技术的发展。

英文摘要:

We demonstrate synthesis of BaZr(S,Se)3 chalcogenide perovskite alloys by selenization of BaZrS3 thin films. The anion-exchange process produces films with tunable composition and band gap without changing the orthorhombic perovskite crystal structure or the film microstructure. The direct band gap is tunable between 1.5 and 1.9 eV. The alloy films made in this way feature 100x stronger photoconductive response and a lower density of extended defects, compared to alloy films made by direct growth. The perovskite structure is stable in high-selenium-content thin films with and without epitaxy. The manufacturing-compatible process of selenization in H2Se gas may spur the development of chalcogenide perovskite solar cell technology.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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