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Investigating the Role of Dye Dipole on Open Circuit Voltage in Solid-State Dye-Sensitized Solar Cells

Shyam S. Pandey, Kyung-Young Lee, Azwar Hayat, Yuhei Ogomi, and Shuzi Hayase

(Received December 28, 2010; accepted February 15, 2011; published online June 20, 2011)

To eliminate the possibility of perturbation caused by a liquid electrolyte and predict the role played by the nature of dipole of sensitizers with respect to the observed open circuit voltage (V_oc) in dye-sensitized solar cells (DSSCs) more precisely, solid-state DSSCs were fabricated using different sensitizing dyes. Results obtained by surface potential measurement indicate that increasing the alkyl chain length in symmetrical squaraine dyes leads to a relatively positive shift in surface potential. The use of dyes exhibiting higher surface potentials leads to the observation of increased V_oc, which has been explained by the dye dipole formation at the TiO₂/hole transporting layer interface leading to an upward shift of the TiO₂ conduction band. It is thus possible to obtain a high V_oc in DSSCs by designing new dyes either having long alkyl chains or a molecular structure having a higher dipole moment exhibiting a relatively positive shift in surface potential.

URL: http://jjap.jsap.jp/link?JJAP/50/06GF08/
DOI: 10.1143/JJAP.50.06GF08
PACS: 84.60.Jt, 84.60.Bk, 81.05.Lg, 68.35.Md

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