Physical Internal Gain Mechanisms of ZnO-Based Nanorod Ultraviolet Photodetectors
The structure of the ZnO-based p-ZnO:LiNO 3 / i-ZnO/n-ZnO:In nanorod ultraviolet (UV) photodetectors was grown on sapphire substrates using the vapor cooling condensation system. To study the internal gain mechanisms of the photodetectors, the ZnO-based nanorods were photochemically passivated for d...
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Veröffentlicht in: | IEEE photonics technology letters 2015-04, Vol.27 (7), p.759-762 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The structure of the ZnO-based p-ZnO:LiNO 3 / i-ZnO/n-ZnO:In nanorod ultraviolet (UV) photodetectors was grown on sapphire substrates using the vapor cooling condensation system. To study the internal gain mechanisms of the photodetectors, the ZnO-based nanorods were photochemically passivated for different time and operated under various environments to vary the defect density resided on the sidewall surface of the ZnO-based nanorods. The mechanisms of the internal gain, which was attributed to the surface band bending effect of the ZnO-based nanorods induced from the sidewall surface defects and the absorbed oxygen molecules, were thus derived. The specific detectivity of 3.25×10 15 cmHz 1/2 W -1 was obtained for the ZnO-based nanorod UV photodetectors treated with the photoelectrochemical passivation process for 2 min. |
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ISSN: | 1041-1135 1941-0174 |
DOI: | 10.1109/LPT.2015.2391276 |