Photoelectric Characteristic under Atmosphere or Vacuum of Monolayer Graphene / Titanium Dioxide Nano Thin Film Ultraviolet Photodetector
| Autor: | LEE, YU-JEN, 李毓仁 |
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| Rok vydání: | 2018 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 106 In this study, graphene has been attracting great interest due to high carrier mobility and wide absorption wavelength, graphene is a suitable material for photodetector. However, high transmittance and fast carrier recombination brought on photodetector that made by pristine graphene weak photoresponsivity. So we deposited TiO2 thin films with two different sintering method to improve the disadvantages of graphene as a photodetector, in hopes of increasing graphene’s invisible light photoresponsivity via the titanium dioxide. We produce components in two different ways and measure their photoelectric property. From the experimental results, we discover that graphene / atmosphere 400 oC 5 L sintered TiO2 thin film device have the best photoresponsivity. Thus, we use 365 nm LED light source on such device and study the characteristics under different voltage and luminosity, we also use the Xe light as the source to measure the full spectrum photoresponsivity of graphene / sintered 5 L TiO2 device. We discovered that the photoresponsivity are over 200 A / W when the wavelength is within the range of 275 to 385 nm, the maximum photoresponsivity and the maximum specific detectivity were up to 437.15 A / W and 2.31 × 10^13 Jones at the wavelength of 325 nm. The totality of the above result signifies that the graphene / TiO2 photodetector can improve the light absorption and enhanced the optical response of the graphene. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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