研究目的
To design and fabricate a self-powered and flexible ultraviolet photodetector based on the ZnO/Ag Schottky junction utilizing the comprehensive pyro-phototronic effect to enhance its performance.
研究成果
The comprehensive pyro-phototronic effect significantly enhances the performance of ZnO/Ag Schottky junction photodetectors, with a maximal transient photoresponsivity improvement of 1465%. The secondary pyroelectric effect modifies the Schottky barrier height, affecting the steady-state photocurrent. This work provides insights into the pyro-phototronic effect's mechanism and offers a pathway to optimize self-powered photodetectors.
研究不足
The study focuses on the ZnO/Ag Schottky junction and may not be directly applicable to other material systems. The performance enhancement is specific to UV illumination at 325 nm, and the effect of other wavelengths is not explored.
1:Experimental Design and Method Selection
The study utilizes the pyro-phototronic effect to enhance the performance of a ZnO/Ag Schottky junction photodetector. The methodology involves the fabrication of a flexible device and the characterization of its dynamic response to UV illumination.
2:Sample Selection and Data Sources
ZnO nanowires (NWs) are synthesized via a low-temperature hydrothermal method on a flexible polyethylene terephthalate (PET) substrate with indium tin oxide (ITO) and ZnO seed layers. The device's response to 325 nm UV laser illumination is measured.
3:List of Experimental Equipment and Materials
Equipment includes a radio frequency magnetron sputtering system (Denton Discovery 635), SEM (Hitachi SU4800), XRD (Shimadzu XRD-6100), UV–vis spectrophotometer (SHIMADZU UV3600), and a customized computer-controlled measurement system with Stanford SRS Low noise current preamplifier (SR570) and SRS Low noise voltage preamplifier (SR560). Materials include PET substrate, ITO, ZnO, Ag, and ammonium hydroxide.
4:Experimental Procedures and Operational Workflow
The fabrication process involves cleaning the PET substrate, depositing ITO and ZnO seed layers, growing ZnO NWs via hydrothermal synthesis, depositing Ag as the top electrode, and connecting testing wires. The device's optical and electrical properties are then characterized.
5:Data Analysis Methods
The photoresponsivity and specific detectivity are calculated from the measured short-circuit currents with and without illumination. The dynamic response characteristics are analyzed to understand the pyro-photronic effect's role.
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SEM
Hitachi SU4800
Hitachi
Characterization of microscopic structures of ZnO NWs
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XRD
Shimadzu XRD-6100
Shimadzu
Collection of XRD patterns
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UV–vis spectrophotometer
SHIMADZU UV3600
SHIMADZU
Measurement of absorption spectra of ZnO
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Low noise current preamplifier
SR570
Stanford SRS
Measurement of I–V characteristics
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Low noise voltage preamplifier
SR560
Stanford SRS
Measurement of I–V characteristics
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He–Cd dual-color laser
IK5751I-G
Kimmon Koha Co., Ltd.
Provision of optical input stimuli
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digital powermeter
PM100D
Thorlab
Measurement of power density
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radio frequency magnetron sputtering system
Denton Discovery 635
Denton
Deposition of thin layers of ITO and ZnO seed layer
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GPIB controller
GPIB-USB-HS, NI 488.2
NI
Control of measurement system
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