Length-Dependent Photoelectric Property of ZnO Nanowires

An interesting phenomenon that the photocurrent (the difference between illumination and dark current) of a ZnO nanowire (NW) under a specified voltage increased as its length increased in a certain range was observed previously and it was supposed to be mainly due to a special mean free path effect...

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Bibliographic Details
Published in:Nanoscale research letters 2022-08, Vol.17 (1), p.76-76, Article 76
Main Authors: Ren, Ren, Ren, Xiaomin, Liu, Hao, Huang, Yongqing, Yuan, Weifang
Format: Article
Language:English
Subjects:
Chemistry and Materials Science
Dark current
Electron density
Electrons
Laboratories
Length-dependent
Lifetime
Materials Science
Molecular Medicine
Nanochemistry
Nanoscale Science and Technology
Nanotechnology
Nanotechnology and Microengineering
Nanowires
Oxygen adsorption capacity
Oxygen vacancies
Photoelectric effect
Photoelectricity
Zinc oxide
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Summary:An interesting phenomenon that the photocurrent (the difference between illumination and dark current) of a ZnO nanowire (NW) under a specified voltage increased as its length increased in a certain range was observed previously and it was supposed to be mainly due to a special mean free path effect (MFPE) which caused a special distribution of dark electron density along the length with two higher electron density regions near the two ends of the NW, respectively, and the lower one in the middle part. However, such an explanation would be unreasonable and the true reasons should be the growing-process caused variation of the oxygen adsorption capacity along the NW length and the length-dependent lifetime of photogenerated carriers. Based on this understanding, a theoretical model to properly explain this phenomenon is proposed and the calculation results are in good agreement with the experimental data. This work has introduced an improved insight into the theory of the length-dependent photoelectric property of ZnO NWs.
ISSN:1556-276X
1931-7573
1556-276X
DOI:10.1186/s11671-022-03715-2