Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 42, Pages 37120-37127Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b09645
Keywords
photodetectors; oxides; time-resolved measurements; nanotubes; heterojunctions; ultraviolet; pulsed laser depositions
Funding
- Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia
- KAUST
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Enhanced ultraviolet (UV) photodetectors (PDs) with high responsivity comparable to that of visible and infrared photodetectors are needed for commercial applications. n-Type ZnO nanotubes (NTs) with high-quality optical, structural, and electrical properties on a p-type Si(100) substrate are successfully fabricated by pulsed laser deposition (PLD) to produce a UV PD with high responsivity, for the first time. We measure the current voltage characteristics of the device under dark and illuminated conditions and demonstrated the high stability and responsivity (that reaches similar to 101.2 A W-1) of the fabricated UV PD. Time-resolved spectroscopy is employed to identify exciton confinement, indicating that the high PD performance is due to optical confinement, the high surface-to-volume ratio, the high structural quality of the NTs, and the high photoinduced carrier density. The superior detectivity and responsivity of our NT-based PD clearly demonstrate that fabrication of high-performance UV detection devices for commercial applications is possible.
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