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Energy Express

Energy Express

  • Editor: Bernard Kippelen
  • Vol. 18, Iss. S3 — Sep. 13, 2010
  • pp: A395–A402

Method to Protect Charge Recombination in the Back-Contact Dye-Sensitized Solar Cell

Beomjin Yoo, Kang-Jin Kim, Doh-Kwon Lee, Kyungkon Kim, Min Jae Ko, Yong Hyun Kim, Won Mok Kim, and Nam-Gyu Park  »View Author Affiliations


Optics Express, Vol. 18, Issue S3, pp. A395-A402 (2010)
http://dx.doi.org/10.1364/OE.18.00A395


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Abstract

We prepared a back-contact dye-sensitized solar cell and investigated effect of the sputter deposited thin TiO2 film on the back-contact ITO electrode on photovoltaic property. The nanocrystalline TiO2 layer with thickness of about 11 μm formed on a plain glass substrate in the back-contact structure showed higher optical transmittance than that formed on an ITO-coated glass substrate, which led to an improved photocurrent density by about 6.3%. However, photovoltage was found to decrease from 817 mV to 773 mV. The photovoltage recovered after deposition of a 35 nm-thick thin TiO2 film on the surface of the back-contact ITO electrode. Little difference in time constant for electron transport was found for the back-contact ITO electrodes with and without the sputter deposited thin TiO2 film. Whereas, time constant for charge recombination increased after introduction of the thin TiO2 film, indicating that such a thin TiO2 film protected back electron transfer, associated with the recovery of photovoltage. As the result of the improved photocurrent density without deterioration of photovoltage, the back-contact dye-sensitized solar cell exhibited 13.6% higher efficiency than the ITO-coated glass substrate-based dye-sensitized solar cell.

© 2010 OSA

OCIS Codes
(000.2700) General : General science

ToC Category:
Photovoltaics

History
Original Manuscript: June 18, 2010
Revised Manuscript: July 24, 2010
Manuscript Accepted: July 27, 2010
Published: August 17, 2010

Virtual Issues
Focus Issue: Thin-Film Photovoltaic Materials and Devices (2010) Optics Express

Citation
Beomjin Yoo, Kang-Jin Kim, Doh-Kwon Lee, Kyungkon Kim, Min Jae Ko, Yong Hyun Kim, Won Mok Kim, and Nam-Gyu Park, "Method to Protect Charge Recombination in the Back-Contact Dye-Sensitized Solar Cell," Opt. Express 18, A395-A402 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-S3-A395


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