Publication date: 6th November 2020
Organic photovoltaic (OPV) devices have advantages, such as lightweight, low-cost and device flexibility, over their inorganic counterparts. However, the active thin film of a BHJ device is formed conventionally by drying a layer of a solution of electron donor and acceptor. With this approach, achieving a fine control over the domain sizes of electron donor and acceptor is challenging. The donor and acceptor tend to separate into individual domains that are too big (micro or sub-micrometre size) for efficient charge transfer and exciton formation. In addition, the films lack a percolating donor and acceptor networks, which leads to frequent recombination of charges before they reach electrodes. To address these problems, we designed novel donor molecules that can self-assemble into nanofibrous networks upon evaporation of common processing solvents. The blend films of the donors with acceptor PC71BM present nanoscale honeycomb-like structure that forms percolating donor and acceptor networks to facilitate charge generation and transport. The power conversion efficiency of BHJ devices is more than doubled. Our work provides a facile approach for the development of efficient OPV devices.
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