Cellular Architecture‐Based All‐Polymer Flexible Thin‐Film Photodetectors with High Performance and Stability in Harsh Environment

Abstract Here, a cellular architecture consisting of hundreds of blend cylinders embedded into P‐type film is designed for all‐polymer (donor J51 and acceptor N2200) flexibility thin‐film photodetectors for the first time. The blend cylinders provide more blend/P‐type interfaces, which is beneficial for excitons to efficiently dissociate, while the high mobility P‐type film guarantees high mobility and free carriers to fast transport. Moreover, each individual cylinder exhibits high resistance to the interdiffusion from the cylinders into the P‐layer, thus it effectively prevents formation of nanoscale network even under stressed conditions. As a result, the photocurrent of cellular device enhances about two orders of magnitude and the rise/decay times decrease to 0.50/1.01 s compared with the blend one. Meanwhile, the all polymer J51:N2200‐based cellular photodetectors show very high stability when heated to 200 °C or bended 1000 times, which is due to the low diffusion rate of the very‐long‐chain polymer and the nature of the cellular structure. These results demonstrate that the cellular structure‐based all‐polymer thin‐film photodetectors might be promising candidates for further applications.