Enhanced-Performance Self-Powered Solar-Blind UV-C Photodetector Based on n-ZnO Quantum Dots Functionalized by p-CuO Micro-pyramids

Norah M. Alwadai, Somak Mitra, Mohamed N. Hedhili, Hadeel Alamoudi, Bin Xin, Naresh Alaal, Iman S. Roqan

Research output: Contribution to journalArticlepeer-review

45 Scopus citations

Abstract

Smart solar-blind UV-C band photodetectors suffer from low responsivity in a self-powered mode. Here, we address this issue by fabricating a novel enhanced solar-blind UV-C photodetector array based on solution-processed n-ZnO quantum dots (QDs) functionalized by p-CuO micro-pyramids. Self-assembled catalyst-free p-CuO micro-pyramid arrays are fabricated on a pre-ablated Si substrate by pulsed laser deposition without a need for a catalyst layer or seeding, while the solution-processed n-ZnO QDs are synthesized by the femtosecond-laser ablation in liquid technique. The photodetector is fabricated by spray-coating ZnO QDs on a CuO micro-pyramid array. The photodetector performance is optimized via a p-n junction structure as both p-ZnO QDs and p-CuO micro-pyramid layers are characterized by wide band gap energies. Two photodetectors (with and without CuO micro-pyramids) are fabricated to show the role of p-CuO in enhancing the device performance. The n-ZnO QD/p-CuO micro-pyramid/Si photodetector is characterized by a superior photo-responsivity of ∼956 mA/W at 244 nm with a faster photoresponse (
Original languageEnglish (US)
JournalACS Applied Materials & Interfaces
DOIs
StatePublished - Jul 8 2021

Bibliographical note

KAUST Repository Item: Exported on 2021-07-12
Acknowledged KAUST grant number(s): BAS/1/1319-01-01
Acknowledgements: The authors thank KAUST for financial support. This work was supported by the base fund (BAS/1/1319-01-01). N.A. and I.S.R. gratefully acknowledge the supercomputing facility at the King Abdullah University of Science and Technology(KAUST) for providing the computational resources to carry out this research work.

ASJC Scopus subject areas

  • General Materials Science

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