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Power conversion efficiency (PCE) of bulk heterojunction (BHJ) organic solar cells has reached above ∼10%. These BHJ cells have potential for flexible thin films at low processing temperatures using roll to roll printing on flexible substrates. Further, the basic materials properties can be tailored through organic synthetic routes. However, the issues related to its durability should be addressed before its commercialization. Hence, a conventional solar cell of the poly (3-hexylthiophene) (P3HT) :(6, 6)-phenyl-C61butyric acid methyl ester (PC61BM) blend on ITO substrates was fabricated, and investigated, which shows improved life time by using a combinational Ca/Al cathode, wherein the deposition of calcium layer is extended beyond the aluminum layer. The extended deposition of calcium layer beyond aluminum prevents the edge degradation by its oxidation and hence protecting the active pixel area of the device, resulting in the improvement of life time of device from ∼80 hours to ∼ 400 hrs

Extended interface layer concept for higher stability and improvement of life time in bulk heterojunction solar cells