Aligned Nanofibers as an Interfacial Layer for Achieving High-Detectivity and Fast-Response Organic Photodetectors

We report that aligned nanofibers (ANs) prepared by electrostatic spinning technology as an interfacial layer can significantly enhance the performance of inverted organic photodetectors. With the insertion of ANs of titanium dioxide (TiO2), the optimized organic photodetectors had a highest detectivity of 2.93 X 10(13) Jones at zero bias, which is about 3 times higher than that of a similar organic photodetector without ANs and also markedly higher than that of traditional silicon photodetectors. The performance of the devices with different TiO2 ANs as the interfacial layer was investigated, and the results exhibited that photodetectors with one-way ANs had the highest detectivity and shortest response time. This work provides a new application of nanofibers fabricated by a simple and controllable process in high-performance organic photodetectors.