Enhancement in photo-response of CuZnS nanocrystals-based photodetector using asymmetric work function electrodes
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Date
2024
Journal Title
Optical Materials
Journal ISSN
Volume Title
Publisher
Elsevier B.V.
Abstract
In this study, an efficient visible light photodetector has been fabricated by using heavy metal-free CuZnS Nanocrystals with average particle size of 13 � 1 nm and has been synthesized by a microwave (MW) assisted synthesis technique. The optical band gap of this nanocrytstal is ?1.7 eV and has an absorbance spectra ranging from 300 to700 nm. This low bandgap nanocrystals has been used to fabricate a photoconductor device with a CuZnS/ZnO bilayer structure. Besides, the device performance has been enhanced by using an asymmetric work-function lateral electrodes. The work-function difference between the electrodes gives a driven voltage between the electrodes, which allows faster collection of charge carriers from the device. As a consequence, a significant photocurrent is generated by the device even without any external bias. The self-biased (at 0 V) external quantum efficiency (EQE) of this device is ? 4 % (at 430 nm) whereas this value reaches ? 20 % under 2 V external bias. The device possesses the responsivity (R?) and detectivity (D) of 8.8 A/W and 3.8 � 1012 Jones at 320 nm respectively under 2 V external bias. � 2024 Elsevier B.V.
Description
Keywords
Lateral heterostructure, Microwave, Nano crystals (NCs), Photodetector, Self-biased, Thin film