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Air Induced Formation of Cs3Bi2Br9/Cs3BiBr6 Bulk Heterojunction and Its Dual-band Photodetection Abilities for Light Communication
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-08-05 , DOI: 10.1002/adfm.202206151 Fa Cao 1, 2 , Ziqing Li 3 , Xinya Liu 1 , Zhifeng Shi 4 , Xiaosheng Fang 1, 3
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-08-05 , DOI: 10.1002/adfm.202206151 Fa Cao 1, 2 , Ziqing Li 3 , Xinya Liu 1 , Zhifeng Shi 4 , Xiaosheng Fang 1, 3
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Metal-halide perovskites have long carrier diffusion lengths, low trap densities, and high carrier mobilities, and are therefore of value in the development of photodetectors (PDs). However, the research on dual-band lead-free perovskite bulk heterojunction has not been well developed. Here, a novel air induced formation of Cs3Bi2Br9/Cs3BiBr6 bulk heterojunction, reaching a high-performance dual-band photodetecting performance with an ultra-violet main band (360 nm) peak responsivity of 5.6 mA W−1 and a blue sub-band (450 nm) peak responsivity of 0.6 mA W−1 at 2 V, is reported. The bulk heterojunction exhibits superior photodetecting performance than that of lateral heterojunction. Furthermore, the PD exhibits a fast response speed (rise time 1.4 µs and decay time 2.0 µs) and good cyclic stability. Theoretical and experimental characterizations suggest Cs3Bi2Br9 exhibits a more stable structure in air than that of Cs3BiBr6. The dual-band photodetection abilities of Cs3Bi2Br9/Cs3BiBr6 bulk-heterojunction demonstrate great application prospects in light communication. These state-of-the-art findings shed light on the fabrication of novel dual-band high-performance PDs based on lead-free perovskite bulk-heterojunction.
中文翻译：
Cs3Bi2Br9/Cs3BiBr6体异质结的空气诱导形成及其用于光通信的双波段光电探测能力
金属卤化物钙钛矿具有长载流子扩散长度、低陷阱密度和高载流子迁移率，因此在光电探测器（PD）的开发中具有重要价值。然而，双波段无铅钙钛矿体异质结的研究还没有得到很好的发展。在这里，一种新颖的空气诱导形成 Cs 3 Bi 2 Br 9 /Cs 3 BiBr 6体异质结，达到了高性能双波段光电探测性能，紫外主波段（360 nm）峰值响应度为 5.6 mA W - 1和 0.6 mA W -1的蓝色子带 (450 nm) 峰值响应度据报道，在 2 V 时。体异质结表现出优于横向异质结的光电检测性能。此外，PD 表现出快速的响应速度（上升时间 1.4 µs 和衰减时间 2.0 µs）和良好的循环稳定性。理论和实验表征表明Cs 3 Bi 2 Br 9在空气中表现出比Cs 3 BiBr 6更稳定的结构。Cs 3 Bi 2 Br 9 /Cs 3 BiBr 6的双波段光电探测能力体异质结在光通信中显示出巨大的应用前景。这些最先进的发现为基于无铅钙钛矿体异质结的新型双波段高性能 PD 的制造提供了启示。
更新日期：2022-08-05
中文翻译：
Cs3Bi2Br9/Cs3BiBr6体异质结的空气诱导形成及其用于光通信的双波段光电探测能力
金属卤化物钙钛矿具有长载流子扩散长度、低陷阱密度和高载流子迁移率，因此在光电探测器（PD）的开发中具有重要价值。然而，双波段无铅钙钛矿体异质结的研究还没有得到很好的发展。在这里，一种新颖的空气诱导形成 Cs 3 Bi 2 Br 9 /Cs 3 BiBr 6体异质结，达到了高性能双波段光电探测性能，紫外主波段（360 nm）峰值响应度为 5.6 mA W - 1和 0.6 mA W -1的蓝色子带 (450 nm) 峰值响应度据报道，在 2 V 时。体异质结表现出优于横向异质结的光电检测性能。此外，PD 表现出快速的响应速度（上升时间 1.4 µs 和衰减时间 2.0 µs）和良好的循环稳定性。理论和实验表征表明Cs 3 Bi 2 Br 9在空气中表现出比Cs 3 BiBr 6更稳定的结构。Cs 3 Bi 2 Br 9 /Cs 3 BiBr 6的双波段光电探测能力体异质结在光通信中显示出巨大的应用前景。这些最先进的发现为基于无铅钙钛矿体异质结的新型双波段高性能 PD 的制造提供了启示。
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