Size-dependent photocurrent of photodetectors with silicon nanocrystals

Sang Kyun Kim; Baek Hyun Kim; Chang Hee Cho; Seong Ju Park

doi:10.1063/1.3130086

Size-dependent photocurrent of photodetectors with silicon nanocrystals

Sang Kyun Kim, Baek Hyun Kim, Chang Hee Cho, Seong Ju Park

Department of Physics and Chemistry

Gwangju Institute of Science and Technology

Research output: Contribution to journal › Article › peer-review

27 Scopus citations

Abstract

We report on the effect of nanocrystal size on the photocurrent of silicon nanocrystal (Si NC) photodetectors. The photocurrent onset energy was increased with decreasing the size of Si NCs, which agreed with the blueshift in the absorption onset. The increase in the quantum efficiency with increasing the size of Si NCs was much larger than the increase in the absorbance with increasing the size of Si NCs. This was attributed to the differences in charge separation for Si NC of different sizes, which was influenced by the recombination rate and binding energy of photogenerated excitons in Si NCs.

Original language	English
Article number	183106
Journal	Applied Physics Letters
Volume	94
Issue number	18
DOIs	https://doi.org/10.1063/1.3130086
State	Published - 2009

Bibliographical note

Funding Information:
This work was supported by the Center for Distributed Sensor Network at GIST, and the Korea Science and Engineering Foundation (KOSEF) NCRC grant funded by the Korean Government (MEST) (Grant No. R15-2008-006-02001-0).

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title = "Size-dependent photocurrent of photodetectors with silicon nanocrystals",

abstract = "We report on the effect of nanocrystal size on the photocurrent of silicon nanocrystal (Si NC) photodetectors. The photocurrent onset energy was increased with decreasing the size of Si NCs, which agreed with the blueshift in the absorption onset. The increase in the quantum efficiency with increasing the size of Si NCs was much larger than the increase in the absorbance with increasing the size of Si NCs. This was attributed to the differences in charge separation for Si NC of different sizes, which was influenced by the recombination rate and binding energy of photogenerated excitons in Si NCs.",

author = "Kim, {Sang Kyun} and Kim, {Baek Hyun} and Cho, {Chang Hee} and Park, {Seong Ju}",

note = "Funding Information: This work was supported by the Center for Distributed Sensor Network at GIST, and the Korea Science and Engineering Foundation (KOSEF) NCRC grant funded by the Korean Government (MEST) (Grant No. R15-2008-006-02001-0).",

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AU - Kim, Sang Kyun

AU - Kim, Baek Hyun

AU - Cho, Chang Hee

AU - Park, Seong Ju

N1 - Funding Information: This work was supported by the Center for Distributed Sensor Network at GIST, and the Korea Science and Engineering Foundation (KOSEF) NCRC grant funded by the Korean Government (MEST) (Grant No. R15-2008-006-02001-0).

PY - 2009

Y1 - 2009

N2 - We report on the effect of nanocrystal size on the photocurrent of silicon nanocrystal (Si NC) photodetectors. The photocurrent onset energy was increased with decreasing the size of Si NCs, which agreed with the blueshift in the absorption onset. The increase in the quantum efficiency with increasing the size of Si NCs was much larger than the increase in the absorbance with increasing the size of Si NCs. This was attributed to the differences in charge separation for Si NC of different sizes, which was influenced by the recombination rate and binding energy of photogenerated excitons in Si NCs.

AB - We report on the effect of nanocrystal size on the photocurrent of silicon nanocrystal (Si NC) photodetectors. The photocurrent onset energy was increased with decreasing the size of Si NCs, which agreed with the blueshift in the absorption onset. The increase in the quantum efficiency with increasing the size of Si NCs was much larger than the increase in the absorbance with increasing the size of Si NCs. This was attributed to the differences in charge separation for Si NC of different sizes, which was influenced by the recombination rate and binding energy of photogenerated excitons in Si NCs.

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VL - 94

JO - Applied Physics Letters

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ER -

Size-dependent photocurrent of photodetectors with silicon nanocrystals

Abstract

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