A simple and effective method via PH1000 modified Ag-Nanowires electrode enable efficient flexible nonfullerene organic solar cells

Flexible transparent electrodes (FTEs) play an important role in determining the performance of flexible organic solar cells (OSCs), Ag-nanowires (AgNWs) with the unique merits of high conductivity, excellent flexibility, and good thermal stability has been taken into more consideration in fabricating highly efficient FTEs. However, the pristine AgNWs film usually suffers a huge surface roughness and incompatibility with the organic absorption layer, thus always leads to a poor power conversion efficiency (PCE). Herein, we demonstrated a simple and effective way through employing poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PH1000) to modify the surface of AgNWs to prepare high-quality FTEs. Based on the PH1000 (100 nm)/AgNWs FTEs, the optimized flexible OSC with PM6:Y6 as active layer exhibits a highest PCE of 12.71%, with an open-circuit voltage (Voc) of 0.814 V, a short-circuit current (Jsc) of 22.61 mA/cm2, and a fill factor (FF) of 0.691, respectively. Which is much higher than the PCE (7.20%) of pristine AgNWs FTEs based device. The enhanced device performance was attributed to the improved morphologies both of the FTEs and the active layers, more effective charge transport and collection efficiency, as well as the decreased charge recombination properties. This work provides an efficient way to fabricate high-quality FTEs and realize efficient flexible OSCs.