High‐Performance All‐Solution Processed Ultrathin Flexible Organic Solar Cells Based on Embedded Silver Nanowires Electrodes Fabricated through Transfer Strategy

Ultrathin flexible organic solar cells (UF‐OSCs) have attracted increasing attention for applications in wearable electronics and flexible display technologies, benefiting from their outstanding mechanical flexibility and high power‐to‐weight ratio. Silver nanowires (AgNWs) are widely used as transparent electrodes owing to their high conductivity, optical transmittance and flexibility. However, the high roughness of AgNWs on flexible substrates adversely affects device performance and the formation of embedded AgNWs through conventional hot pressing is not suitable for ultrathin flexible substrates. Here, a transfer strategy is developed to fabricate a PH1000/em‐AgNWs/parylene ultrathin flexible electrode with a thickness of 1 μm, which achieves a transmittance of 89.1% and a sheet resistance ( R _sh ) of 15.2 Ω/sq. UF‐OSCs incorporating this electrode achieve a power conversion efficiency (PCE) of 16.7%. In addition, all solution‐processed semitransparent ultrathin flexible organic solar cells (OSCs) are developed with AgNWs/PH1000 top electrode, exhibiting a PCE of 13.4% with an average visible transmittance exceeding 20%. By further optimization of the active‐layer, a high light utilization efficiency of 4.1% is achieved in semitransparent ultrathin flexible OSCs. The ultrathin flexible devices also exhibit excellent mechanical durability, showing over 90% of PCE retention after 1,000 bending cycles at a bending radius of 1 mm.