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Energy Express

Energy Express

  • Editor: Christian Seassal
  • Vol. 21, Iss. S6 — Nov. 4, 2013
  • pp: A953–A963

Current matching using CdSe quantum dots to enhance the power conversion efficiency of InGaP/GaAs/Ge tandem solar cells

Ya-Ju Lee, Yung-Chi Yao, Meng-Tsan Tsai, An-Fan Liu, Min-De Yang, and Jiun-Tsuen Lai  »View Author Affiliations

Optics Express, Vol. 21, Issue S6, pp. A953-A963 (2013)

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A III-V multi-junction tandem solar cell is the most efficient photovoltaic structure that offers an extremely high power conversion efficiency. Current mismatching between each subcell of the device, however, is a significant challenge that causes the experimental value of the power conversion efficiency to deviate from the theoretical value. In this work, we explore a promising strategy using CdSe quantum dots (QDs) to enhance the photocurrent of the limited subcell to match with those of the other subcells and to enhance the power conversion efficiency of InGaP/GaAs/Ge tandem solar cells. The underlying mechanism of the enhancement can be attributed to the QD’s unique capacity for photon conversion that tailors the incident spectrum of solar light; the enhanced efficiency of the device is therefore strongly dependent on the QD’s dimensions. As a result, by appropriately selecting and spreading 7 mg/mL of CdSe QDs with diameters of 4.2 nm upon the InGaP/GaAs/Ge solar cell, the power conversion efficiency shows an enhancement of 10.39% compared to the cell’s counterpart without integrating CdSe QDs.

© 2013 OSA

OCIS Codes
(040.5350) Detectors : Photovoltaic
(310.1210) Thin films : Antireflection coatings
(220.4241) Optical design and fabrication : Nanostructure fabrication

ToC Category:

Original Manuscript: July 22, 2013
Revised Manuscript: September 13, 2013
Manuscript Accepted: September 15, 2013
Published: September 20, 2013

Ya-Ju Lee, Yung-Chi Yao, Meng-Tsan Tsai, An-Fan Liu, Min-De Yang, and Jiun-Tsuen Lai, "Current matching using CdSe quantum dots to enhance the power conversion efficiency of InGaP/GaAs/Ge tandem solar cells," Opt. Express 21, A953-A963 (2013)

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