Efficient organic Schottky junction solar cells with a platinum chloride-treated PEDOT:PSS interfacial layer

Abstract

We demonstrate highly efficient organic-based Schottky junction solar cells (OSJSCs) obtained by poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) modification with solution-processed platinum chloride (PtCl4) treatment. The effect of PtCl4 on PEDOT: PSS properties and device performances of solar cells was investigated. Kelvin probe and 4-point probe studies demonstrated that PtCl4 decreased the PEDOT: PSS sheet-resistance and increased the PEDOT: PSS work-function, thereby inducing an improved built-in potential and interface resistance. As a result, with the aid of the PtCl4 treatment, the Schottky junction device had a high power conversion efficiency of 3%, which was more than 20% higher than the reference OSJSCs with no PtCl4, indicating that PtCl4 can be a promising PEDOT: PSS modifier for raising the cell-performances of Schottky-junction based organic solar cells.