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, Nam Gyu Park

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


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 TiO 2 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 TiO 2 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.

Original languageEnglish
Pages (from-to)A395-A402
JournalOptics Express
Issue number19
StatePublished - 13 Sep 2010


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