The improvement of polymer photodetector based on 1D-ZnO nanorod arrays/0D-ZnO quantum dots composite film

Polymer photodetectors have been paid much attention in the field of wearable sensing devices and solar cells, due to their excellent performance. In this work, self-powered n-Zinc Oxide/p-Poly(3-hexylthiophene) (n-ZnO/p- P3HT) inorganic-organic hybrid heterojunction photodetectors were successfully fabricated. The polymer P3HT as active layer can efficiently response for visible light. The n-ZnO as light scattering and electron transport layer was composited by 1D-ZnO nanorod arrays (NRAs) and 0D-ZnO quantum dots (QDs) hybridization structure. Compared with the reference device of ZnO NRAs/P3HT, the ZnO NRAs/6 Layers ZnO QDs/P3HT device achieves the best performance, and it shows a photo-to-dark current ratio of 9058, a responsivity of 15 mA/W and a normalized detection of 2.08 x 1011 Jones under 440 nm light illumination and zero-voltage bias. The present work provides a new way to optimize the performance of polymer photodetectors.

Automated summary

In this work, self-powered n-Zinc Oxide/p-Poly(3-hexylthiophene) (n-ZnO/p- P3HT) inorganic-organic hybrid heterojunction photodetectors were successfully fabricated. The polymer P3HT can efficiently respond to visible light, while the n-ZnO layer functions as a light scattering and electron transport layer. By incorporating 1D-ZnO nanorod arrays (NRAs) and 0D-ZnO quantum dots (QDs) hybridization structure, the performance of the photodetector was greatly improved. The present work provides a new way to optimize the performance of polymer photodetectors.