25 October 2016 Highly sensitive NIR PtSi/Si-nanostructure detectors
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Proceedings Volume 10157, Infrared Technology and Applications, and Robot Sensing and Advanced Control; 101570A (2016) https://doi.org/10.1117/12.2244134
Event: International Symposium on Optoelectronic Technology and Application 2016, 2016, Beijing, China
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).
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Hua-gao Li, Hua-gao Li, Pei Guo, Pei Guo, An-bo Yuan, An-bo Yuan, Fei Long, Fei Long, Rui-zhi Li, Rui-zhi Li, Ping Li, Ping Li, Yi Li, Yi Li, } "Highly sensitive NIR PtSi/Si-nanostructure detectors", Proc. SPIE 10157, Infrared Technology and Applications, and Robot Sensing and Advanced Control, 101570A (25 October 2016); doi: 10.1117/12.2244134; https://doi.org/10.1117/12.2244134

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