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Proceedings Paper

Highly sensitive NIR PtSi/Si-nanostructure detectors
Author(s): Hua-gao Li; Pei Guo; An-bo Yuan; Fei Long; Rui-zhi Li; Ping Li; Yi Li
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Paper Abstract

We report a high external quantum efficiency (EQE) photodiode detector with PtSi/Si-nanostructures. Black silicon nanostructures were fabricated by metal-assist chemical etching (MCE), a 2 nm Pt layer was subsequently deposited on black silicon surface by DC magnetron sputtering system, and PtSi/Si-nanostructures were formed in vacuum annealing at 450 oC for 5 min. As the PtSi/Si-nanostructures presented a spiky shape, the absorption of incident light was remarkably enhanced for the repeat reflection and absorption. The breakdown voltage, dark current, threshold voltage and responsivity of the device were investigated to evaluate the performance of the PtSi/Si-nanostructures detector. The threshold voltage and dark currents of the PtSi/Si-nanostructure photodiode tends to be slightly higher than those of the standard diodes. The breakdown voltage remarkably was reduced because of existing avalanche breakdown in PtSi/Si-nanostructures. However, the photodiodes had high response at room temperature in near infrared region. At -5 V reverse bias voltage, the responsivity was 0.72 A/W in 1064 nm wavelength, and the EQE was 83.9%. By increasing the reverse bias voltage, the responsivity increased. At -60 V reverse bias voltage, the responsivity was 3.5 A/W, and the EQE was 407.5%, which means the quantum efficiency of PtSi/Si-nanostructure photodiodes was about 10 times higher than that of a standard diode. Future research includes how to apply this technology to enhance the NIR sensitivity of image sensors, such as Charge Coupled Devices (CCD).

Paper Details

Date Published: 25 October 2016
PDF: 7 pages
Proc. SPIE 10157, Infrared Technology and Applications, and Robot Sensing and Advanced Control, 101570A (25 October 2016); doi: 10.1117/12.2244134
Show Author Affiliations
Hua-gao Li, Chongqing Optoelectronics Research Institute (China)
Pei Guo, Chongqing Optoelectronics Research Institute (China)
An-bo Yuan, Chongqing Optoelectronics Research Institute (China)
Fei Long, Chongqing Optoelectronics Research Institute (China)
Rui-zhi Li, Chongqing Optoelectronics Research Institute (China)
Ping Li, Chongqing Optoelectronics Research Institute (China)
Yi Li, Chongqing Optoelectronics Research Institute (China)


Published in SPIE Proceedings Vol. 10157:
Infrared Technology and Applications, and Robot Sensing and Advanced Control

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