Quantum dot-doped porous silicon metal–semiconductor metal photodetector

Quantum dot-doped porous silicon metal–semiconductor metal photodetector

In this paper, we report on the enhancement of spectral photoresponsivity of porous silicon metal–semiconductor metal (PS-MSM) photodetector embedded with colloidal quantum dots (QDs) inside the pore layer. The detection efficiency of QDs/PS hybrid-MSM photodetector was enhanced by five times larger...

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Bibliographic Details
Main Authors: Hsiao, Vincent K. S., Chou, Chia-Man, Cho, Hsing-Tzu, Yong, Ken-Tye, Law, Wing-Cheung
Other Authors: School of Electrical and Electronic Engineering
Format: Article
Language:English
Published: 2014
Subjects:
DRNTU::Engineering::Electrical and electronic engineering::Semiconductors
Online Access:https://hdl.handle.net/10356/101420
http://hdl.handle.net/10220/18686
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Institution: Nanyang Technological University
Language: English
Description
Summary:In this paper, we report on the enhancement of spectral photoresponsivity of porous silicon metal–semiconductor metal (PS-MSM) photodetector embedded with colloidal quantum dots (QDs) inside the pore layer. The detection efficiency of QDs/PS hybrid-MSM photodetector was enhanced by five times larger than that of the undoped PS-MSM photodetector. The bandgap alignment between PS (approximately 1.77 eV) and QDs (approximately 1.91 eV) facilitates the photoinduced electron transfer from QDs to PS whereby enhancing the photoresponsivity. We also showed that the photoresponsitivity of QD/PS hybrid-MSM photodetector depends on the number of layer coatings of QDs and the pore sizes of PS.

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