Organic solar cells (OSCs) based on polymers and small molecules have attracted considerable attention as a promising alternative for producing clean and renewable energy. Over the past few years, power conversion efficiencies (PCEs) of over 11% have been achieved for polymer-based single-junction organic photovoltaic (OPV) devices with bulk heterojunction (BHJ) architectures. Recently, we have reported the new semiconducting small molecules (BTR) and polymer materials (PBDT-BT) with an OPV device efficiency of close to 10%. Here, we achieved the high performance OPV devices using solvent vapour annealing (SVA) of active layer and interface modification of transparent electrode. In this work, we have used new molecular materials BQR along with conjugated polymer PTB7-Th and PC<sub>71</sub>BM as a ternary blend active layer to fabricate high performance OPV devices. With optimum blend ratio and morphology control of active layer, we have achieved a power conversion of 10.7% for OPV devices. The enhanced performance of ternary blend OPV devices was mainly due to improved light absorption, charge generation and BHJ morphology of active layer. In addition, our recent work on the development of new semiconducting donor and interface materials, device optimization, morphology control and interface engineering approaches used to achieve high performance OPV devices will be presented.

High performance ternary blend organic solar cells using conjugated polymer and molecular materials

254th National Meeting (2017)

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