Self-Driven Perovskite Dual-Band Photodetectors Enabled by a Charge Separation Reversion Mechanism,Advanced Optical Materials

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Self-Driven Perovskite Dual-Band Photodetectors Enabled by a Charge Separation Reversion Mechanism
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2021-06-13 , DOI: 10.1002/adom.202100517
Jian Wang _{1,

2} , Xiuwen Xu ₁ , Shuang Xiao ₁ , Yu Li ₁ , Wei Qian ₁ , Jun Yu ₁ , Kai Zhang ₁ , Shihe Yang _{1,

2}

Affiliation

New mechanisms and modalities for multiband light detection are highly desirable for the ever-growing developments in machine vision technologies. Demonstrated here is a unique talent of halide perovskites for making self-driven dual-band photodetectors with a negative broadband response in the above-bandgap absorption region and a positive narrowband response in the sub-bandgap absorption region. The device operates through a charge separation reversion mechanism by controlling the built-in electric field and the thickness-dependent light absorption profile in the active material. Impressively, the demarcation wavelengths between the negative broadband and the positive narrowband responses can be continuously adjusted, with the positive narrowband response easily tuned from 410 to 675 nm. The dual-band photodetector exhibits an extremely low noise of 10⁻¹⁵ A Hz^−1/2 and a high specific detectivity of >10¹² Jones in both above-bandgap and sub-bandgap absorption regions, opening up application opportunities in intelligent recognition and biomedical diagnosis.

中文翻译：

由电荷分离回复机制实现的自驱动钙钛矿双波段光电探测器

对于机器视觉技术不断发展的发展，非常需要用于多波段光检测的新机制和模式。这里展示了卤化物钙钛矿的独特才能，用于制造自驱动双波段光电探测器，在带隙以上吸收区域具有负宽带响应，在子带隙吸收区域具有正窄带响应。该器件通过控制活性材料中的内置电场和厚度相关的光吸收分布，通过电荷分离反转机制运行。令人印象深刻的是，负宽带和正窄带响应之间的分界波长可以连续调整，正窄带响应很容易从 410 到 675 nm 调谐。⁻¹⁵ A Hz ^−1/2和在带隙以上和子带隙吸收区域中 >10 ¹² Jones的高比检测率，为智能识别和生物医学诊断开辟了应用机会。

更新日期：2021-06-13

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