Window-film Type Semitransparent Organic Photovoltaics Based on Conducting Polymer Electrodes for Building-integrated Photovoltaics

Abstract

Semitransparent organic photovoltaics (ST-OPVs) with polymeric transparent electrodes are in the spotlight as window film type solar cells due to their advantages such as flexibility, high electrical conductivity, transparency, and solution processability. Currently, encouraging progress has been achieved on the ST-OPVs that focus on individual parameters such as high power conversion efficiency (PCE) and average visible transmittance (AVT), however, the passive properties as window films are yet to be explored. Furthermore, conventional transparent electrodes based on a vacuum process are expensive and possess poor productivity. Herein, we demonstrate all-solution processed multifunctional ST-OPVs using PEDOT (poly(3,4-ethylene dioxythiophene)) as a top electrode doped with perfluorinated sulfonic acid. Importantly, the perfluorinated sulfonic acid-treated PEDOT electrode exhibits high visible transmittance and outstanding electrical properties and simultaneously showed high infrared reflectance. Consequently, we successfully achieved high light utilization efficiency and thermal insulating capability.