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Author

Kwon, Tae-Hyuk
Energy Recognition
Research Interests
  • Energy transfer, organic solar cells, supercapacitor, ultrasonic spray chemistry, dithienothiophene, iridium complexes, phosphorescent bioapplications

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Control and Monitoring of Dye Distribution in Mesoporous TiO2 Film for Improving Photovoltaic Performance

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Title
Control and Monitoring of Dye Distribution in Mesoporous TiO2 Film for Improving Photovoltaic Performance
Author
Kim, Byung-ManHan, Hyun-GyuKim, Jeong SooShin, HyeonOhKwon, Tae-Hyuk
Keywords
charge recombination; charge transport; dye distribution; dye-sensitized solar cell; plasmon sensor
Issue Date
201701
Publisher
AMER CHEMICAL SOC
Citation
ACS APPLIED MATERIALS & INTERFACES, v.9, no.3, pp.2572 - 2580
Abstract
Dye distribution in a mesoporous TiO2 film is a key factor in the performance of dye-sensitized solar cells, but there has been little research on it. Here we report even dye distribution within the porous TiO2 film achieved by a physical driving force of gas flow. Gas-assisted dye arrangement, gas bubbling soaking (GBS), significantly accelerates the dye infiltration compared to conventional overnight soaking (OS). As a demonstration, we investigated the time-dependent dye infiltration using plasmon sensors. GBS produces an even vertical dispersion throughout the film, as illustrated by time-of-flight secondary ion mass spectrometry depth profiles. For devices using a 7-μm-thick active layer and a ruthenium-based dye (N719), only 15 min of GBS treatment produced better power conversion efficiency (PCE) than the optimal result from OS treatment (15 h), despite a lower dye capacity. Dual-GBS treatment (20 min for N719 and 10 min for YD2, a porphyrin dye) produced the best PCE (9.0%) in the device, which was ∼17% higher than that treated with dual-OS (10 h for N719 and 5 h for YD2). Such improvements are associated with reduced dye-free sites inside the porous TiO2 film after GBS treatment, leading to faster charge transport and slower charge loss.
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DOI
http://dx.doi.org/10.1021/acsami.6b15488
ISSN
1944-8244
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