Origin of High Open Circuit Voltage in Solid State Dye-Sensitized Solar Cells Employing Polymer Electrolyte
Yong Soo Kang a, Tea-Yon Kim a, Donghoon Song a, Eva M. Barea b, Juan Bisquert b
a Hanyang University, Seoul, South Korea, 1013, Fusion Technology Center (FTC), Department of Energy Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu,, Seoul, 133791, Korea, Republic of
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Swansea, United Kingdom, 2016 June 29th - July 1st
Organizers: James Durrant, Henry Snaith and David Worsley
Poster, Tea-Yon Kim, 244
Publication date: 28th March 2016

Energy level alignment and electron recombination rate chaining has been occurred in dye-sensitized photoanode interface with solid polymer electrolyte (SPE), comparison with common liquid electrolyte (LE). Herein, the physic-chemical origin of these phenomena is firstly investigated by a comparison study between dye-sensitized solar cells (DSCs) with SPE and LE which has been quantitatively conducted by changing the cation, lithium (Li+) and 1-methyl-3-propylimidazolium (MPI+), in the electrolyte. The main reasons to above changing may be due to the ethylene oxide (EO) units of SPE containing PEO and/or poly(ethylene glycol) dimethyl ether (PEGDME). The EO units coordinatively interact with Ti atoms of the TiO2 layer to form a passivation layer, resulting in the reduction in the electron recombination and the upward shift in the CB. The EO units also interact with both Li+ and MPI+, but much stronger with the former than the latter, which captures cations, particularly Li+, and reduces in turn the effective salt concentration in the electrolytes. Cationic capturing consequently decreased the adsorbed concentration of Li+ on the TiO2 layer, and the less decrease in Ec as measured quantitatively for the first time, and finally the increase in Voc. In conclusion, the above proven advantageous characters of SPE, less downward-shifting in the TiO2 CB and prohibiting the electron recombination, can be expected to be utilized for higher performance in SPE-based sensitized solar cells.



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