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Pseudohalide Additives Enhanced Perovskite Photodetectors
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-11-10 , DOI: 10.1002/adom.202001587 Ruiming Li 1 , Jiali Peng 1 , Yalun Xu 1 , Wei Li 1 , Lihao Cui 1 , Yanyan Li 1 , Qianqian Lin 1
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-11-10 , DOI: 10.1002/adom.202001587 Ruiming Li 1 , Jiali Peng 1 , Yalun Xu 1 , Wei Li 1 , Lihao Cui 1 , Yanyan Li 1 , Qianqian Lin 1
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Hybrid organic–inorganic perovskites have made considerable progress for optoelectronic applications in recent years. In particular, novel hybrid perovskites and materials combinations have been devised to overcome the materials and device stability challenges. Recently, pseudohalide salts have emerged as promising additives to enhance the long‐term stability of the photovoltaic devices. It is found that these pseudohalide ions can effectively passivate the crystal grains and hinder the degradation, which also places perovskites in a very interesting space for the consideration of reducing dark current and noise for photodetection. These possibilities provide strong incentives for a detailed study on the performance metrics of perovskite photodetectors with pseudohalide additives. In this work, photodiodes based on formamidinium lead iodide (FAPbI3) with/without pseudohalide ions are fabricated, and the device performance both at room temperature and cooled with liquid nitrogen is evaluated. Interestingly, it is found that the photodetectors incorporated with pseudohalide ions exhibit not only better stability but also hugely improved figure of merit, including extremely low dark current of ≈10 pA, fast response of ≈50 ns, and high detectivity of >1012 Jones. More importantly, compared with control perovskite photodetectors, the devices with pseudohalide additives demonstrate less temperature‐dependence and superior repeatability.
中文翻译：
伪卤化物添加剂增强的钙钛矿光电探测器
近年来，有机-无机钙钛矿杂化材料在光电应用方面取得了长足的进步。特别地，已经设计出新颖的混合钙钛矿和材料组合以克服材料和装置稳定性的挑战。近来，假卤化物盐已成为有希望的添加剂，以增强光伏器件的长期稳定性。发现这些假卤离子可有效钝化晶粒并阻碍其降解，出于减少暗电流和光检测噪声的考虑，钙钛矿也放置在非常有趣的空间中。这些可能性为深入研究含假卤化物添加剂的钙钛矿光电探测器的性能指标提供了强有力的动力。在这项工作中，基于甲ami碘化铅（FAPbI）的光电二极管3）制造有/没有假卤化物离子，并评估在室温下和用液氮冷却的器件性能。有趣的是，发现掺入假卤化物离子的光电探测器不仅显示出更好的稳定性，而且还显着提高了品质因数，包括极低的暗电流≈10pA，快速响应的≈50ns和高探测性> 10 12 Jones 。更重要的是，与对照钙钛矿光电探测器相比，带有假卤化物添加剂的器件显示出更少的温度依赖性和出色的可重复性。
更新日期：2021-01-18
中文翻译：
伪卤化物添加剂增强的钙钛矿光电探测器
近年来，有机-无机钙钛矿杂化材料在光电应用方面取得了长足的进步。特别地，已经设计出新颖的混合钙钛矿和材料组合以克服材料和装置稳定性的挑战。近来，假卤化物盐已成为有希望的添加剂，以增强光伏器件的长期稳定性。发现这些假卤离子可有效钝化晶粒并阻碍其降解，出于减少暗电流和光检测噪声的考虑，钙钛矿也放置在非常有趣的空间中。这些可能性为深入研究含假卤化物添加剂的钙钛矿光电探测器的性能指标提供了强有力的动力。在这项工作中，基于甲ami碘化铅（FAPbI）的光电二极管3）制造有/没有假卤化物离子，并评估在室温下和用液氮冷却的器件性能。有趣的是，发现掺入假卤化物离子的光电探测器不仅显示出更好的稳定性，而且还显着提高了品质因数，包括极低的暗电流≈10pA，快速响应的≈50ns和高探测性> 10 12 Jones 。更重要的是，与对照钙钛矿光电探测器相比，带有假卤化物添加剂的器件显示出更少的温度依赖性和出色的可重复性。
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