Li Lin, Chen Hongyu, Fang Zhimin, Meng Xianyi, Zuo Chuantian, Lv Menglan, Tian Yongzhi, Fang Ying, Xiao Zuo, Shan Chongxin, Xiao Zhengguo, Jin Zhiwen, Shen Guozhen, Shen Liang, Ding Liming
Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, Harbin, 150025, China.
Center for Excellence in Nanoscience (CAS), Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS), National Center for Nanoscience and Technology, Beijing, 100190, China.
Adv Mater. 2020 Jun;32(24):e1907257. doi: 10.1002/adma.201907257. Epub 2020 May 7.
An electrically modulated single-/dual-color imaging photodetector with fast response speed is developed based on a small molecule (CO 8DFIC)/perovskite (CH NH PbBr ) hybrid film. Owing to the type-I heterojunction, the device can facilely transform dual-color images to single-color images by applying a small bias voltage. The photodetector exhibits two distinct cut-off wavelengths at ≈544 nm (visible region) and ≈920 nm (near-infrared region), respectively, without any power supply. Its two peak responsivities are 0.16 A W at ≈525 nm and 0.041 A W at ≈860 nm with a fast response speed (≈10 ns). Under 0.6 V bias, the photodetector can operate in a single-color mode with a peak responsivity of 0.09 A W at ≈475 nm, showing a fast response speed (≈10 ns). A physical model based on band energy theory is developed to illustrate the origin of the tunable single-/dual-color photodetection. This work will stimulate new approaches for developing solution-processed multifunctional photodetectors for imaging photodetection in complex circumstances.
基于小分子（CO 8DFIC）/钙钛矿（CH NH PbBr ）混合膜开发了一种具有快速响应速度的电调制单/双色成像光电探测器。由于I型异质结，该器件通过施加小偏置电压可轻松将双色图像转换为单色图像。该光电探测器在无任何电源的情况下，分别在≈544 nm（可见光区域）和≈920 nm（近红外区域）呈现两个不同的截止波长。其两个峰值响应率在≈525 nm时为0.16 A/W，在≈860 nm时为0.041 A/W，响应速度快（≈10 ns）。在0.6 V偏置下，该光电探测器可在单色模式下工作，在≈475 nm处的峰值响应率为0.09 A/W，响应速度快（≈10 ns）。基于能带能量理论建立了一个物理模型，以说明可调谐单/双色光探测的起源。这项工作将激发开发用于复杂环境成像光探测的溶液处理多功能光电探测器的新方法。
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