Journal of Inorganic Materials ›› 2019, Vol. 34 ›› Issue (5): 560-566.DOI: 10.15541/jim20180571

• RESEARCH LETTERS • Previous Articles     Next Articles

A Self-powered UV-visible Photodetector Based on p-Se/Al2O3/n-ZnO Nanorod Array Heterojunction

Chao-Xiang SUN,Liang CHEN,Yu CHANG,Wei TIAN(),Liang LI   

  1. Jiangsu Key Laboratory of Thin Films, School of Physical Science and Technology, Soochow University, Suzhou 215006, China
  • Received:2018-12-04 Published:2019-05-20 Online:2019-05-14
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  • Supported by:
    National Natural Science Foundation of China(51502184);Foundation item: National Natural Science Foundation of China(51872191);College Students' Innovation and Entrepreneurship Training Program(201710285084X)


Self-powered photodetector is capable of transforming radiation signals to electronic signals without assistance of external power supply, which is widely utilized in industry and military. Herein, p-Se/n-ZnO nanorod array heterojunction was successfully synthesized and its application as UV-visible photodetector was explored. Due to the proper built-in electric field at the interface of ZnO and Se, the photogenerated electrons and holes are separated and transported in opposite directions, giving rise to high photocurrent at zero bias. Thus, this heterojunction can work as an independent and wireless self-powered photodetector. Introduction of Al2O3 interlayer between Se and ZnO efficiently reduces the dark current. The resulting device achieves high responsivity of 55 μA·W -1 and specific detectivity of 5×10 10Jones at 500 nm, as well as fast response speed (rise time of 0.9 ms and decay time of 0.3 ms).

Key words: ZnO, heterojunction, self-powered, photodetector

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