Fast Response Solar-Blind Photodetector with a Quasi-Zener Tunneling Effect Based on Amorphous In-Doped Ga2O3 Thin Films

A high-performance solar-blind photodetector with a metal–semiconductor–metal structure was fabricated based on amorphous In-doped Ga2O3 thin films prepared at room temperature by radio frequency magnetron sputtering. The photodetector shows a high responsivity (18.06 A/W) at 235 nm with a fast rise time (4.9 μs) and a rapid decay time (230 μs). The detection range was broadened compared with an individual Ga2O3 photodetector because of In doping. In addition, the uneven In distribution at different areas in the film results in different resistances, which causes a quasi-Zener tunneling internal gain mechanism. The quasi-Zener tunneling internal gain mechanism has a positive impact on the fast response speed and high responsivity.

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Growth and characterization of β-Ga2O3 thin films by sol-gel method for fast-response solar-blind ultraviolet photodetectors

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2018.06.313 ◽

2018 ◽

Vol 766 ◽

pp. 601-608 ◽

Cited By ~ 26

Author(s):

Hao Shen ◽

Yinong Yin ◽

Kun Tian ◽

Karthikeyan Baskaran ◽

Libing Duan ◽

...

Keyword(s):

Thin Films ◽

Sol Gel ◽

Fast Response ◽

Gel Method ◽

Sol Gel Method ◽

Solar Blind ◽

Ultraviolet Photodetectors

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Polycrystalline Ga2O3 Nanostructure-Based Thin Films for Fast-Response Solar-Blind Photodetectors

ACS Applied Nano Materials ◽

10.1021/acsanm.1c02782 ◽

2022 ◽

Author(s):

Manni Chen ◽

Zhipeng Zhang ◽

Zesheng Lv ◽

Runze Zhan ◽

Huanjun Chen ◽

...

Keyword(s):

Thin Films ◽

Fast Response ◽

Solar Blind

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Highly Uniform, Self‐Assembled AlGaN Nanowires for Self‐Powered Solar‐Blind Photodetector with Fast‐Response Speed and High Responsivity

Advanced Optical Materials ◽

10.1002/adom.202000893 ◽

2020 ◽

pp. 2000893

Author(s):

Danhao Wang ◽

Chen Huang ◽

Xin Liu ◽

Haochen Zhang ◽

Huabin Yu ◽

...

Keyword(s):

Response Speed ◽

Fast Response ◽

High Responsivity ◽

Solar Blind ◽

Self Assembled ◽

Self Powered ◽

Highly Uniform

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Studies on Thin Films (Dielectric and Metallic) Constituting Micro Thermo-Mechanical Sensors Embedded in Metal Structures

Microelectromechanical Systems ◽

10.1115/imece2004-61404 ◽

2004 ◽

Author(s):

Arindom Datta ◽

Hongseok Choi ◽

Xiaochun Li

Keyword(s):

Thin Film ◽

Thin Films ◽

Metal Structure ◽

Fast Response ◽

Metal Substrate ◽

Strain Gages ◽

Structural Components ◽

Metal Structures ◽

Thin Film Thermocouples ◽

Mechanical Sensors

It is of interest to obtain the thermomechanical response of tools, equipment, and structural components in a real manufacturing environment. Microfabricated thin film thermocouples and strain gages are attractive for their small size and fast response. It is novel and challenging to fabricate these sensors on metal substrate and finally embed them into location of interest. Consequently, the materials (dielectric and metallic) constituting the sensor need to be characterized and optimized properly for reliability. We present here results of characterization and optimization of materials making a thermomechanical sensor to be embedded in metal structure.

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High-Responsivity Solar-Blind Ultraviolet Photodetectors Based on Carbon Nanodots/Graphene Hybrids

IEEE Transactions on Electron Devices ◽

10.1109/ted.2021.3051111 ◽

2021 ◽

Vol 68 (3) ◽

pp. 1101-1106

Author(s):

Yong Fang ◽

Zhiwei Zhao ◽

Mengru Zhu ◽

Zhengjin Weng ◽

Chao Fang ◽

...

Keyword(s):

Carbon Nanodots ◽

High Responsivity ◽

Solar Blind ◽

Ultraviolet Photodetectors

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High-Responsivity Solar-Blind Photodetector Based on $ \hbox{Mg}_{0.46}\hbox{Zn}_{0.54}\hbox{O}$ Thin Film

IEEE Electron Device Letters ◽

10.1109/led.2012.2196675 ◽

2012 ◽

Vol 33 (7) ◽

pp. 1033-1035 ◽

Cited By ~ 50

Author(s):

Qinghong Zheng ◽

Feng Huang ◽

Jin Huang ◽

Qichan Hu ◽

Dagui Chen ◽

...

Keyword(s):

Thin Film ◽

High Responsivity ◽

Solar Blind

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FEM Simulation of Frequency-Selective Surface Based on Thermoelectric Bi-Sb Thin Films for THz Detection

Photonics ◽

10.3390/photonics8040119 ◽

2021 ◽

Vol 8 (4) ◽

pp. 119

Author(s):

Anastasiia Tukmakova ◽

Ivan Tkhorzhevskiy ◽

Artyom Sedinin ◽

Aleksei Asach ◽

Anna Novotelnova ◽

...

Keyword(s):

Thin Films ◽

Response Times ◽

Fem Simulation ◽

Film Surface ◽

Frequency Selective Surface ◽

Fast Response ◽

Radiation Absorption ◽

Thz Radiation ◽

Frequency Filter ◽

Frequency Selective

Terahertz (THz) filters and detectors can find a wide application in such fields as: sensing, imaging, security systems, medicine, wireless connection, and detection of substances. Thermoelectric materials are promising basis for THz detectors’ development due to their sensitivity to the THz radiation, possibility to be heated under the THz radiation and produce voltage due to Seebeck effect. Thermoelectric thin films of Bi-Sb solid solutions are semimetals/semiconductors with the band gap comparable with THz energy and with high thermoelectric conversion efficiency at room temperature. Detecting film surface can be transformed into a periodic frequency selective surface (FSS) that can operate as a frequency filter and increases the absorption of THz radiation. We report for the first time about the simulation of THz detector based on thermoelectric Bi-Sb thin-filmed frequency-selective surface. We show that such structure can be both detector and frequency filter. Moreover, it was shown that FSS design increases not only a heating due to absorption but a temperature gradient in Bi-Sb film by two orders of magnitude in comparison with continuous films. Local temperature gradients can reach the values of the order of 100 K·mm−1. That opens new perspectives for thin-filmed thermoelectric detectors’ efficiency increase. Temperature difference formed due to THz radiation absorption can reach values on the order of 1 degree. Frequency-transient calculations show the power dependence of film temperature on time with characteristic saturation at times around several ms. That points to the perspective of reaching fast response times on such structures.

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YBa2Cu3O7 Thin Films on Polycrystalline Diamond Films with Buffer Layers

MRS Proceedings ◽

10.1557/proc-275-137 ◽

1992 ◽

Vol 275 ◽

Cited By ~ 1

Author(s):

G. Cui ◽

C. P. Beetz ◽

B. A. Lincoln ◽

P. S. Kirlin

Keyword(s):

Thin Films ◽

Diamond Films ◽

Rf Sputtering ◽

Polycrystalline Diamond ◽

Fast Response ◽

Buffer Layers ◽

Multichip Modules ◽

Ir Detectors ◽

Ybco Films ◽

First Time

ABSTRACTThe deposition of in-situ YBa2CU3O7-δ Superconducting films on polycrystalline diamond thin films has been demonstrated for the first time. Three different composite buffer layer systems have been explored for this purpose: (1) Diamond/Zr/YSZ/YBCO, (2) Diamond/Si3N4/YSZ/YBCO, and (3) Diamond/SiO2/YSZ/YBCO. The Zr was deposited by dc sputtering on the diamond films at 450 to 820 °C. The YSZ was deposited by reactive on-axis rf sputtering at 680 to 750 °C. The Si3N4 and SiO2 were also deposited by on-axis rf sputtering at 400 to 700 °C. YBCO films were grown on the buffer layers by off-axis rf sputtering at substrate temperatures between 690 °C and 750 °C. In all cases, the as-deposited YBCO films were superconducting above 77 K. This demonstration enables the fabrication of low heat capacity, fast response time bolometric IR detectors and paves the way for the use of HTSC on diamond for interconnect layers in multichip modules.

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