Journal
IEEE TRANSACTIONS ON ELECTRON DEVICES
Volume 69, Issue 7, Pages 3768-3774Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TED.2022.3175705
Keywords
Zinc oxide; II-VI semiconductor materials; Substrates; Silicon; Absorption; Sputtering; X-ray scattering; Axial; glancing angle deposition (GLAD); heterostructure (HS); nanowire (NW); n-ZnO; p-CuO; photodetector (PD)
Funding
- Science and Engineering Research Board (SERB), Department of Science and Technology (DST), Government of India [EMR/2017/001863]
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In this study, a photodetector based on axial n-ZnO/p-CuO heterostructure nanowires was fabricated on Si substrate using the glancing angle deposition technique. SEM and TEM images confirmed the formation of well-aligned and vertical nanowire structure, and increased photo-absorption was observed. XPS analysis showed no deviation in electronic state after the formation of the heterostructure. The resulting PD exhibited a high rectification ratio, low dark current, and ultrafast photoresponse.
Photodetector (PD) based on axial n-ZnO/p-CuO heterostructure (HS) nanowires (NWs) array was fabricated on Si substrate by using glancing angle deposition (GLAD) technique. The field emission scanning electron microscope (FE-SEM) image shows the formation of a well-aligned and vertical NW structure. A typical high-resolution transmission electron microscope (HR-TEM) image confirms the formation of an axial HS NW consisting of ZnO NW at the top and CuO NW at the bottom. A twofold enhanced photo-absorption was observed for axial n-ZnO/p-CuO HS NW as compared to pristine ZnO NWs. Moreover, X-ray photoelectron spectroscopy (XPS) analysis prove that there is no deviation in electronic state after the formation of HS. The axial n-ZnO/p-CuO HS NW based PD exhibited a very high rectification ratio of 1200, low dark current ( $I_{d}$ ) of 0.09 nA and an ultrafast photoresponse with rise time and fall time of 0.49 and 0.11 ms, respectively.
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