Solution-Processed Highly Efficient Semitransparent Organic Solar Cells with Low Donor Contents

Semitransparent organic solar cells (ST-OSCs) are promising candidates for applications in building-integrated photovoltaics (BIPV) as windows and facades. The challenge to achieve highly efficient ST-OSCs is the trade-off between power conversion efficiency (PCE) average visible transmittance (AVT). Herein, solution-processed demonstrated on basis a polymer donor, PM6, small molecule acceptor, Y6; lowering visible-absorbing PM6 contents blends could increase AVT maintain PCE. Additionally, conductive PEDOT:PSS used top electrode due its high transparency, good conductivity, solution processability. Efficient with 20 wt % PCE of 7.46% 36.4%. light utilization (LUE) 2.72% among best reported values ST-OSCs. This work provides straightforward approach by combining low fraction visible-wavelength-selective donors near-infrared nonfullerene acceptors simultaneously.