Formation of double-layered TiO2 structures with selectively-positioned molecular dyes for efficient flexible dye-sensitized solar cells
- Authors
- Kim, Eun Yi; Yu, Sora; Moon, Jeong Hoon; Yoo, Seon Mi; Kim, Chulhee; Kim, Hwan Kyu; Lee, Wan In
- Issue Date
- 30-11월-2013
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Dye-sensitized solar cell; Flexible; Tandem; Double-layered TiO2; Interfacial layer
- Citation
- ELECTROCHIMICA ACTA, v.111, pp.261 - 267
- Indexed
- SCIE
SCOPUS
- Journal Title
- ELECTROCHIMICA ACTA
- Volume
- 111
- Start Page
- 261
- End Page
- 267
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/101549
- DOI
- 10.1016/j.electacta.2013.08.081
- ISSN
- 0013-4686
- Abstract
- To fabricate flexible dye-sensitized solar cells (DSCs) utilizing full solar spectrum, the double-layered TiO2 films, selectively loading two different dyes in discrete layers, were formed on a plastic substrate by transferring the high-temperature-processed N719/TiO2 over an organic dye (TA-St-CA)-sensitized TiO2 film by a typical compression process at room temperature. It was found that interface control between two TiO2 layers is crucial for the efficient transport of photo-injected electrons from the N719/TiO2 to the TA-St-CA/TiO2 layer. Electron impedance spectra (EIS) and transient photoelectron spectroscopic analyses exhibited that introduction of a thin interfacial TiO2 layer between the two TiO2 layers remarkably decreased the resistance at the interface, while increasing the electron diffusion constant (Do) by 10 times. As a result, the photovoltaic conversion efficiency (eta) of the flexible tandem DSC was 6.64%, whereas that of the flexible cell derived from the single TA-St-CA/TiO2 layer was only 2.98%. Another organic dye (HC-acid), absorbing a short wavelength region of solar spectrum, was also applied to fabricate flexible tandem DSC. The 77 of the cell derived from the HC-acid/TiO2 layer was only 2.91%, but that of the tandem cell obtained by transferring the high-temperature-processed N719/TiO2 was 6.86%. (C) 2013 Elsevier Ltd. All rights reserved.
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