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Enhanced Spectral Response of ZnO-Nanorod-Array-Based Ultraviolet Photodetectors by Alloying Non-Isovalent Cu–O with CuAlO 2 P-Type Layer.
- Source :
- Nanomaterials (2079-4991); May2023, Vol. 13 Issue 9, p1472, 14p
- Publication Year :
- 2023
-
Abstract
- CuAlO<subscript>2</subscript> was synthesized by a hydrothermal method, in which the Cu–O dimers were incorporated by simply altering the ratio of the reactants and the temperature. The incorporation process increases the grain size in CuAlO<subscript>2</subscript>, and modulates the work function and binding energies for CuAlO<subscript>2</subscript> due to the partial substitution of Cu<superscript>+</superscript> 3d<superscript>10</superscript> with Cu<superscript>2+</superscript> 3d<superscript>9</superscript> orbitals in the valence band maximum by alloying non-isovalent Cu–O with a CuAlO<subscript>2</subscript> host. Based on the ZnO nanorod arrays (NRs) ultraviolet photodetector, CuAlO<subscript>2</subscript>/Cu–O fabricated by the low-cost drop-coating method was used as the p-type hole transport layer. The incorporation of the Cu–O clusters into CuAlO<subscript>2</subscript> lattice to enhance the conductivity of CuAlO<subscript>2</subscript> is an effective way for improving ZnO NRs/CuAlO<subscript>2</subscript> device performance. The photodetectors exhibit significant diode behavior, with a rectification ratio approaching 30 at ±1 V, and a dark saturation current density 0.81 mA cm<superscript>−2</superscript>. The responsivity of the ZnO-NRs-based UV photodetector increases from 13.2 to 91.3 mA/W at 0 V bias, with an increase in the detectivity from 2.35 × 10<superscript>10</superscript> to 1.71 × 10<superscript>11</superscript> Jones. Furthermore, the ZnO NRs/[CuAlO<subscript>2</subscript>/Cu–O] photodetector exhibits a maximum responsivity of 5002 mA/W at 1.5 V bias under 375 nm UV illumination. [ABSTRACT FROM AUTHOR]
- Subjects :
- SPECTRAL sensitivity
PHOTODETECTORS
VALENCE bands
NANORODS
BINDING energy
ZINC alloys
Subjects
Details
- Language :
- English
- ISSN :
- 20794991
- Volume :
- 13
- Issue :
- 9
- Database :
- Complementary Index
- Journal :
- Nanomaterials (2079-4991)
- Publication Type :
- Academic Journal
- Accession number :
- 163687605
- Full Text :
- https://doi.org/10.3390/nano13091472