Resonant Raman study of dye instability in dye‐sensitized TiO2 system: The effect of surface states

• DOI: 10.1002/pssa.201127729
• Publication Date: 2012-04-23T12:45:06Z
• Authors: Kunjie Wu; Kai Shen; Weifeng Liu; Liuer Wu; Deliang Wang
• Keywords: Open-circuit voltage

Abstract The most critical problem in commercialization of the dye‐sensitized solar cell (DSSC) is its long‐term stability. Many factors contribute to instability a DSSC. In order clarify role surface defects on instability, we modified TiO 2 chemical states, fabricated DSSCs with very simple structure, and carried out resonant Raman scattering monitor dye degradation under open‐circuit condition. results showed that stability was sensitive states. can be described by an exponential decay law. oxygen vacancy–Ti 3+ state enhanced recombination electron oxidized electrolyte, i.e ., conduction band injected back consequently regeneration rate I − , which came from reduction ${\rm I}_{3}^{- } $ electrons. Under condition increased when it attached relatively high percentage state. occurred at /electrolyte interface resulted much decreased voltage short‐circuit current