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All-inorganic Cs2AgBiBr6/CuSCN-based photodetectors for weak light imaging

全无机Cs2AgBiBr6/CuSCN基光电探测器及其在弱光成像中的应用

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Abstract

Weak light imaging has drawn more and more attention because of its promising potential for practical applications in security monitoring and space exploration. In this work, all-inorganic Cs2AgBiBr6 double perovskite-based self-powered photodetectors containing inorganic copper thiocyanate (CuSCN) as hole-transport layers (HTLs) are successfully fabricated and applied for weak light imaging, which is the first report on the weak light imaging application of all-inorganic lead-free perovskite photodetectors. CuSCN films with favorable optical property and hole extraction capability are prepared via a cost efficient and fast solvent removal method, demonstrating the potential for high-performance perovskite-based devices as transparent components. It is revealed that the band alignment of the device is effectively optimized with the presence of CuSCN HTLs, which can availably transport holes while block electrons at the Cs2AgBiBr6/CuSCN interface, resulting in remarkable improvement of photoresponse performance. The responsivity and detectivity are 0.34 A W−1 and 1.03×1013 Jones, respectively. In particular, the light current has a boost of almost 10 times. Furthermore, the photodetectors are integrated into a self built light detection imaging system uti lizing the focused laser scanning imaging mode. With illumination of as low as 5 nW cm−2 (405 nm), the image involving graphics and words with a size of 5 cm×5 cm can still be distinctly recognized. These results suggest the promising potential of all-inorganic perovskite-based devices for weak light detection and imaging applications.

摘要

弱光成像技术在安全监测、 空间勘探、 医疗成像及通讯领域有着广泛的应用. 光电探测器是弱光成像技术的核心元件, 决定了成像系统的质量. 本工作首次将硫氰酸亚铜(CuSCN)薄膜作为无机空穴传输层(HTLs)与全无机Cs2AgBiBr6双钙钛矿薄膜相结合, 获得了具有优良弱光探测能力的光电探测器. CuSCN薄膜具有优异的空穴提取能力, 可以有效地传输空穴并调节能带排列, 从而减少载流子在Cs2AgBiBr6/CuSCN界面处的复合, 使器件的光电流提升近10倍. 该器件在~1 nW cm−2的弱光下的响应度和探测率分别达到了0.34 A W−1和1.03×1013 Jones. CuSCN薄膜还具有优异的光透过率, 保证了器件的半透明特性. 我们搭建了基于聚焦激光扫描成像模式的弱光成像系统, 并将Cs2AgBiBr6/CuSCN异质结光电探测器集成于该系统中. 采用一幅包含图形和文字的图案(尺寸为5 cm×5 cm)为成像对象. 在低至5 nW cm−2(405 nm)的辐照下, 该系统依然能够输出清晰的图像. 这些研究结果显示了基于Cs2Ag-BiBr6/CuSCN结构的全无机光电探测器在弱光探测和成像领域的巨大潜力.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (51772135), the Ministry of Education of China (6141A02022516), the Fundamental Research Funds for the Central Universities (11619103), China Postdoctoral Science Foundation (2019M663376), Guangdong Province Higher Vocational Colleges & Schools Pearl River Scholar Funded Scheme (2017), the Natural Science Foundation of Guangdong Province, China (2017A020215135 and 2018A030310659) and the Science and Technology Program of Guangzhou, China (201804010432).

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Authors and Affiliations

  1. Siyuan Laboratory, Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials, Department of Physics, Jinan University, Guangzhou, 510632, China

    Genghua Yan  (颜庚骅), Zhong Ji  (计钟), Zhuowei Li  (李卓伟), Bangqi Jiang  (江邦齐), Ye Yuan  (袁野) & Wenjie Mai  (麦文杰)

  2. Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Jinan University, Guangzhou, 510632, China

    Wenjie Mai  (麦文杰)

  3. Guangdong Institute of New Materials, Guangdong Academy of Sciences, Guangzhou, 510650, China

    Min Kuang  (况敏)

  4. Department of Light Chemical Engineering, Guangdong Polytechnic, Foshan, 528041, China

    Xiang Cai  (蔡祥)

Authors
  1. Genghua Yan  (颜庚骅)
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  2. Zhong Ji  (计钟)
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  3. Zhuowei Li  (李卓伟)
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  4. Bangqi Jiang  (江邦齐)
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  5. Min Kuang  (况敏)
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  6. Xiang Cai  (蔡祥)
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  7. Ye Yuan  (袁野)
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  8. Wenjie Mai  (麦文杰)
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Contributions

Author contributions Yan G designed and engineered the device samples and wrote the paper; Ji Z designed and engineered the imaging system; Li Z and Jiang B performed the chemical experiments; Yan G, Kuang M and Cai X accomplished the characterizations; Yuan Y proposed the idea and analyzed the data. This work was guided and supported by Mai W. All authors contributed to the general discussion.

Corresponding authors

Correspondence to Ye Yuan  (袁野) or Wenjie Mai  (麦文杰).

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Conflict of interest The authors declare that they have no conflict of interest.

Additional information

Genghua Yan received her BSc degree in applied physics from Central South University in 2013 and PhD degree in materials physics and chemistry from Sun Yat-Sen University (SYSU) in 2018. She joined the College of Science and Engineering, Jinan University as a postdoctor since the middle of 2018. Her main research interest focuses on advanced thin film materials and photoelectric devices.

Ye Yuan received his BSc degree in optical information science and technology from SYSU in 2013 and PhD degree in materials physics and chemistry from SYSU in 2018. He now is an assistant research fellow at the Department of Physics, Jinan University. His research interests are thin-film photoelectric materials and devices, especially heterojunction photodetectors and solar cells.

Wenjie Mai is a professor as well as head of the Deparment of Physics, Jinan University. He received his BSc degree from Peking University in 2002 and PhD degree from Georgia Institute of Technology (GIT) in 2009. He joined Jinan University in 2009. He was a visiting fellow at GIT from 2012 to 2013. His research areas include photoelectric materials, energy materials and the related flexible devices. He currently focuses on supercapacitors, photodetectors and solar cells.

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Yan, G., Ji, Z., Li, Z. et al. All-inorganic Cs2AgBiBr6/CuSCN-based photodetectors for weak light imaging. Sci. China Mater. 64, 198–208 (2021). https://doi.org/10.1007/s40843-020-1358-5

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