Organic solar cell (OSC) is deemed as promising for future photovoltaics due to its potentially large-area and low-cost processing and the inherent mechanical and chemical flexibility.Transparent electrode is one of the essential aspects in designing efficient OSCs.More importantly, it is desirable for the electrodes to possess mechanical flexibility compatible with many organic materials.Widely utilized as transparent electrodes, indium tin oxide (ITO) is relatively expensive and chemically unstable.Furthermore, the brittleness of ITO can induce device failure under bending.