Journal
ACS PHOTONICS
Volume 1, Issue 4, Pages 354-359Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ph4001108
Keywords
ZnO; nanowire; photodetector; surface band bending; surface effect
Categories
Funding
- National Science Council of Taiwan [102-2628-M-002-006-MY3, 101-2221-E-002-115-MY2]
- National Taiwan University [103R7823]
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The surface effect on the photodetection of metal oxide nanostructures acting as a double-edged sword achieves ultrahigh photogain but unavoidably prolongs the response time due to slow oxygen adsorption/desorption processes. In this study, we break the compromise to enhance the UV photogain by 3 orders of magnitude as well as increase the photoresponse speed by 5 times via incorporating open-circuit p-n nanoscale heterojunctions (NHJs) by forming single-crystalline p-NiO nanoparticles on n-ZnO nanowires. This is because the formation of NHJs enhances surface band bending of ZnO nanowires, improving the spatial separation efficiency of photogenerated electrons and holes, and passivates the ZnO surfaces by minimizing the interaction of photocarriers with chemisorbed oxygen molecules. The concept using NHJs explores a new pathway toward ultrafast and supersensitive photodetection.
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