Interface engineering is a critical strategy for improving the performance of polymer solar cells. A good interfacial material should fulfill several requirements including 1) good charge selectivity to improve the charge collection efficiency at the corresponding electrodes, 2) matched energy levels with the conduction band and valence band of the light harvesting film to maximize the photovoltage of the solar cells, 3) high conductivity to minimize the interfacial resistance loss and forming Ohmic contact with the electrodes (Fig. 1).1 In this talk I will discuss several strategies to design new conjugated polymer-based interfacial materials with desired electrical conductivity, energy levels and processibility to improve the charge collection efficiency and compatibility for roll-to-roll coating of polymer solar cells based on fullerene 2,3 and non-fullerene acceptors.4 The application of the new interfacial materials as an interconnection layer for highly efficient tandem polymer solar cells with power conversion efficiency(PCE)>12% will also be discussed.5,6

© 2017 Optical Society of America

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