Infrared photodiode based on colloidal PbSe nanocrystal quantum dots

Dehu Cui; Jian Xu; Sheng Yong Xu; Gary Paradee; Bradley A. Lewis; Michael D. Gerhold

doi:10.1109/TNANO.2006.877432

Infrared photodiode based on colloidal PbSe nanocrystal quantum dots

Dehu Cui, Jian Xu, Sheng Yong Xu, Gary Paradee, Bradley A. Lewis, Michael D. Gerhold

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

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Abstract

We report in this paper our studies on the photoconductivity and photovoltaic effects of colloidal PbSe nanocrystal quantum dots (NQDs) which were embedded in conductive polymer matrices to form hybrid polymer/NQD Infrared photodiodes. The generation of photocarriers in PbSe NQDs and their transport in NQD-polymer composites were described by a simplified band diagram picture of the device. Both photocurrent and photovoltage outputs were measured from the NQD-incorporated photodiode upon the illumination of near-infrared (NIR) light, whereas the net polymer-based devices do not exhibit any photoresponsivity. The Intensity dependence of the photocurrent indicates the pseudomonomolecular recombination kinetics in the NQD-polymer composite. The measured photocurrent spectrum is consistent with the absorption characteristic of PbSe NQDs. Further enhancement of the photodiode efficiency can be achieved by engineering the nanocrystal surface to reduce the potential barriers due to the ligant capping molecules.

Original language	English (US)
Article number	1652852
Pages (from-to)	362-367
Number of pages	6
Journal	IEEE Transactions on Nanotechnology
Volume	5
Issue number	4
DOIs	https://doi.org/10.1109/TNANO.2006.877432
State	Published - Jul 2006

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Computer Science Applications
Electrical and Electronic Engineering

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10.1109/TNANO.2006.877432

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title = "Infrared photodiode based on colloidal PbSe nanocrystal quantum dots",

abstract = "We report in this paper our studies on the photoconductivity and photovoltaic effects of colloidal PbSe nanocrystal quantum dots (NQDs) which were embedded in conductive polymer matrices to form hybrid polymer/NQD Infrared photodiodes. The generation of photocarriers in PbSe NQDs and their transport in NQD-polymer composites were described by a simplified band diagram picture of the device. Both photocurrent and photovoltage outputs were measured from the NQD-incorporated photodiode upon the illumination of near-infrared (NIR) light, whereas the net polymer-based devices do not exhibit any photoresponsivity. The Intensity dependence of the photocurrent indicates the pseudomonomolecular recombination kinetics in the NQD-polymer composite. The measured photocurrent spectrum is consistent with the absorption characteristic of PbSe NQDs. Further enhancement of the photodiode efficiency can be achieved by engineering the nanocrystal surface to reduce the potential barriers due to the ligant capping molecules.",

author = "Dehu Cui and Jian Xu and Xu, {Sheng Yong} and Gary Paradee and Lewis, {Bradley A.} and Gerhold, {Michael D.}",

note = "Funding Information: Manuscript received January 20, 2006; revised March 31, 2006. This work was supported in part by the U. S. Army Research Office under Contract DAAD19-02-D-0001 and in part by the Pennsylvania State University Nanofabrication Facility and the National Science Foundation Cooperative under Agreement No. 0335765, National Nanotechnology Infrastructure Network, with Cornell University. The review of this paper was arranged by Associate Editor F. Terry.",

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AU - Lewis, Bradley A.

AU - Gerhold, Michael D.

N1 - Funding Information: Manuscript received January 20, 2006; revised March 31, 2006. This work was supported in part by the U. S. Army Research Office under Contract DAAD19-02-D-0001 and in part by the Pennsylvania State University Nanofabrication Facility and the National Science Foundation Cooperative under Agreement No. 0335765, National Nanotechnology Infrastructure Network, with Cornell University. The review of this paper was arranged by Associate Editor F. Terry.

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N2 - We report in this paper our studies on the photoconductivity and photovoltaic effects of colloidal PbSe nanocrystal quantum dots (NQDs) which were embedded in conductive polymer matrices to form hybrid polymer/NQD Infrared photodiodes. The generation of photocarriers in PbSe NQDs and their transport in NQD-polymer composites were described by a simplified band diagram picture of the device. Both photocurrent and photovoltage outputs were measured from the NQD-incorporated photodiode upon the illumination of near-infrared (NIR) light, whereas the net polymer-based devices do not exhibit any photoresponsivity. The Intensity dependence of the photocurrent indicates the pseudomonomolecular recombination kinetics in the NQD-polymer composite. The measured photocurrent spectrum is consistent with the absorption characteristic of PbSe NQDs. Further enhancement of the photodiode efficiency can be achieved by engineering the nanocrystal surface to reduce the potential barriers due to the ligant capping molecules.

AB - We report in this paper our studies on the photoconductivity and photovoltaic effects of colloidal PbSe nanocrystal quantum dots (NQDs) which were embedded in conductive polymer matrices to form hybrid polymer/NQD Infrared photodiodes. The generation of photocarriers in PbSe NQDs and their transport in NQD-polymer composites were described by a simplified band diagram picture of the device. Both photocurrent and photovoltage outputs were measured from the NQD-incorporated photodiode upon the illumination of near-infrared (NIR) light, whereas the net polymer-based devices do not exhibit any photoresponsivity. The Intensity dependence of the photocurrent indicates the pseudomonomolecular recombination kinetics in the NQD-polymer composite. The measured photocurrent spectrum is consistent with the absorption characteristic of PbSe NQDs. Further enhancement of the photodiode efficiency can be achieved by engineering the nanocrystal surface to reduce the potential barriers due to the ligant capping molecules.

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Infrared photodiode based on colloidal PbSe nanocrystal quantum dots

Abstract

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