Modeling of photocurrent in dye-sensitized solar cells fabricated with PVDF-HFP-based gel-type polymeric solid electrolyte

Abstract

We discussed photocurrent of dye-sensitized solar cells (DSCs) with model equations of polymeric solid electrolyte (PSE)-based and liquid electrolyte-based DSCs. The short-circuit current ( J sc ) was found out to increase even further by either increasing the diffusion coefficient of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:msubsup> <mml:mtext>I</mml:mtext> <mml:mn>3</mml:mn> <mml:mo>−</mml:mo> </mml:msubsup> </mml:mrow> </mml:math> and/or I – or decreasing the cell-gap, or both. In particular, the cell-gap dependence of J sc indicates clearly that narrowing the cell-gap is a simple, effective way to increase the J sc . We also discussed the diffusion coefficient dependence of J sc . The back electron transfer from TiO 2 to an oxidized dye was taken into account and explained the diffusion coefficient dependence of J sc well. .