Journal
NANO ENERGY
Volume 54, Issue -, Pages 429-436Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2018.10.022
Keywords
Pyro-phototronic effect; UV photodetector; ZnO NWs; Chopper frequency; Self-powered
Categories
Funding
- National Natural Science Foundation of China [11574033, 51432005, 11074024, 11704032]
- Beijing cooperative construction project
- Fundamental Research Funds for the Central Universities
- Beijing Higher Education Young Elite Teacher Project
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By coupling pyroelectric effect and photoelectric effect, pyro-phototronic effect is proposed to effectively modulate photon response characteristics of the detector with p-n junction. Here, tuning role of chopper frequency on pyroelectric effect in p-n junction is revealed by demonstrating the dynamic performances of pyrophototronic effect based UV photodetectors (PDs) under different power densities and different bias voltages. Different from the traditional pyroelectric detectors without p-n junction, the pyro-phototronic effect based PDs possess the optimal response frequency that is strong dependent on the stimuli power density and the external bias voltage. With the power density increasing from 7.9 x 10(-5) to 1.5 x 10(-3) Wcm(-2), the optimal chopper frequency of the self-powered PD increases from 50 Hz to 200 Hz. By changing the bias voltages, the transient currents have a group of maximal values for different chopper frequencies at a same voltage of -0.2 V when the detector is illuminated by UV light with a power density of 1.8 x 10(-2) Wcm(-2). The results present the fundamental working characteristics of the pyro-phototronic effect based PD and provide guidance for its future applications in IR imaging, fast detecting and smart optoelectronic systems.
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