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Novel perovskite/TiO2/Si trilayer heterojunctions for high-performance self-powered ultraviolet-visible-near infrared (UV-Vis-NIR) photodetectors

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Abstract

Methylammonium lead halide perovskites have been reported to be promising candidates for high-performance photodetectors. However, self-powered broadband ultraviolet-visible-near infrared (UV-Vis-NIR) photodetection with high responsivity is difficult to achieve in these materials. Here, we demonstrate, for the first time, a novel trilayer hybrid photodetector made by combining an n-type Si wafer, TiO2 interlayer and perovskite film. By precisely controlling the thickness of the TiO2 layer, enhanced separation and reduced recombination of carriers at the Si–perovskite interface are obtained. As a result, perovskite film, when combined with a low-bandgap Si, extends the wavelength range of photo response to 1,150 nm, along with improved on/off ratio, responsivity, and specific detectivity, when compared to pristine perovskite. Results obtained in this work are comparable or even better than those reported for perovskite-based UV-Vis-NIR photodetectors. In particular, the hybrid photodetectors can operate in a self-powered mode. The mechanism of enhancement has been explored and it is found that the increased separation and reduced recombination of photogenerated carriers at the junction interface leads to the improved performance.

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Acknowledgements

This research was supported by the National Natural Science Foundation of China (Nos. 51672026, 51422206, 51372020, and 51372159), the National Key Research and Development Program of China (No. 2016YFA0202701), the Major National Scientific Research Projects (No. 2013CB932602), 1000 Youth Talents Plan, 333 High-level Talents Cultivation Project of Jiangsu Province, Six Talents Peak Project of Jiangsu Province, Distinguished Young Scholars Foundation by Jiangsu Science and Technology Committee (No. BK20140009), and Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

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Author notes

  1. Fengren Cao and Qingliang Liao contributed equally to this work.

Authors and Affiliations

  1. College of Physics, Optoelectronics and Energy, Center for Energy Conversion Materials & Physics (CECMP), Jiangsu Key Laboratory of Thin Films, Soochow University, Suzhou, 215006, China

    Fengren Cao, Kaimo Deng, Liang Chen & Liang Li

  2. State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Qingliang Liao & Yue Zhang

Authors
  1. Fengren Cao
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  2. Qingliang Liao
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  3. Kaimo Deng
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  4. Liang Chen
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  5. Liang Li
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  6. Yue Zhang
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Corresponding authors

Correspondence to Liang Li or Yue Zhang.

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Novel perovskite/TiO2/Si trilayer heterojunctions for high-performance self-powered ultraviolet-visible-near infrared (UV-Vis-NIR) photodetectors

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Cao, F., Liao, Q., Deng, K. et al. Novel perovskite/TiO2/Si trilayer heterojunctions for high-performance self-powered ultraviolet-visible-near infrared (UV-Vis-NIR) photodetectors. Nano Res. 11, 1722–1730 (2018). https://doi.org/10.1007/s12274-017-1790-1

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