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Temperature-Gradient-Controlled Method Enabling Shape Control of 2D Perovskite Single Crystals for Photodetection
Physica Status Solidi-Rapid Research Letters ( IF 2.5 ) Pub Date : 2021-04-10 , DOI: 10.1002/pssr.202100099 Guoqiang Liu 1 , Jiang Liu 1 , Zhengfang Fan 1 , Xulin He 1 , Kun Luo 1 , Qinyan Ye 1 , Cheng Liao 1
Physica Status Solidi-Rapid Research Letters ( IF 2.5 ) Pub Date : 2021-04-10 , DOI: 10.1002/pssr.202100099 Guoqiang Liu 1 , Jiang Liu 1 , Zhengfang Fan 1 , Xulin He 1 , Kun Luo 1 , Qinyan Ye 1 , Cheng Liao 1
Affiliation
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2D hybrid organic–inorganic lead halide perovskites have been reported as promising photodetection active semiconductor materials due to their excellent photoelectric properties and stability. However, the solution growth of 2D crystal materials is affected adversely by narrow process windows, low process reproducibility, and small crystal sizes. Herein, a temperature-gradient-controlled method to grow high-quality 2D perovskite crystals on the order of centimeters is developed. Using this new method, BA2PbI4 and mixed-cation BA2FAxMA1−xPb2I7 crystals are produced with shape control and improved quality at the bottom of the precursor solution. Subsequently, their photoelectric responses are investigated comprehensively. Photodetectors based on these single crystals exhibit outstanding performances, affording 10−11 A dark current, > 103 on–off ratio, ≈10 mA W−1 responsivity, excellent stability, and linear photoresponse. Moreover, the annealing of crystals effectively reduces the dark current of the detectors. The mixed-cation BA2FA0.4MA0.6Pb2I7 crystal demonstrates improved photoelectric response and a significant change in morphology.
中文翻译：
温度梯度控制方法能够对用于光电检测的二维钙钛矿单晶进行形状控制
二维杂化有机-无机卤化铅钙钛矿因其优异的光电性能和稳定性而被报道为有前途的光电检测活性半导体材料。然而，2D 晶体材料的溶液生长受到窄工艺窗口、低工艺再现性和小晶体尺寸的不利影响。在这里，开发了一种温度梯度控制的方法来生长厘米数量级的高质量 2D 钙钛矿晶体。使用这种新方法，BA 2 PbI 4和混合阳离子 BA 2 FA x MA 1− x Pb 2 I 7晶体是在前体溶液底部通过形状控制和改进的质量生产的。随后，对它们的光电响应进行了全面的研究。基于这些单晶的光电探测器表现出出色的性能，可提供 10 -11 A 暗电流、> 10 3开关比、≈10 mA W -1响应度、出色的稳定性和线性光响应。此外，晶体的退火有效地降低了探测器的暗电流。混合阳离子 BA 2 FA 0.4 MA 0.6 Pb 2 I 7晶体显示出改进的光电响应和显着的形态变化。
更新日期：2021-04-10
中文翻译：
温度梯度控制方法能够对用于光电检测的二维钙钛矿单晶进行形状控制
二维杂化有机-无机卤化铅钙钛矿因其优异的光电性能和稳定性而被报道为有前途的光电检测活性半导体材料。然而，2D 晶体材料的溶液生长受到窄工艺窗口、低工艺再现性和小晶体尺寸的不利影响。在这里，开发了一种温度梯度控制的方法来生长厘米数量级的高质量 2D 钙钛矿晶体。使用这种新方法，BA 2 PbI 4和混合阳离子 BA 2 FA x MA 1− x Pb 2 I 7晶体是在前体溶液底部通过形状控制和改进的质量生产的。随后，对它们的光电响应进行了全面的研究。基于这些单晶的光电探测器表现出出色的性能，可提供 10 -11 A 暗电流、> 10 3开关比、≈10 mA W -1响应度、出色的稳定性和线性光响应。此外，晶体的退火有效地降低了探测器的暗电流。混合阳离子 BA 2 FA 0.4 MA 0.6 Pb 2 I 7晶体显示出改进的光电响应和显着的形态变化。
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