Semitransparent, non-fullerene and flexible all-plastic solar cells

Abstract Semitransparent, non-fullerene and flexible all-plastic organic solar cell (OSC) based on a blend of poly(3-hexylthiophene) (P3HT) and non-fullerene acceptor IDT-2BR is fabricated using conducting polymer poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) as bottom electrode and film-transfer laminated PEDOT:PSS as top electrode. The solar cell shows average visible transmittance of ca. 50%, which can be potentially used for electricity-generating windows. The all-plastic device shows lower power conversion efficiency (PCE) of 2.88% than the traditional inverted device (4.2%), owing to much higher transmittance and lower conductivity of PEDOT:PSS. Our non-fullerene system P3HT:IDT-2BR shows better performance than fullerene system P3HT:PC 61 BM (PCE = 2.2%) in all-plastic OSCs. Furthermore, the non-fullerene OSC shows better bending stability than the fullerene counterpart.