摘要
Perovskite quantum dots (PQDs) require ligands on their surfaces to passivate defects and prevent aggregation. However, the ligands construct the interface relationship between the PQDs, which may seriously hinder the carrier transport. Hence, we propose a molecular engineering strategy of using 3,4-ethylenedioxythiophene (EDOT) to perfectly solve this problem, benefiting from its high conjugation and passivation ability to CsPbBr_(3) PQDs. Furthermore, EDOT on the surface of PQDs can be in-situ polymerized under the photocurrent of the photodetector, thus interconnecting the PQDs which enhanced the performance of the photodetectors up to 178% of its initial performance. We have thoroughly investigated the electropolymerization process of EDOT and its passivation effect on PQDs. The simple lateral photodetector based on EDOT PQDs exhibits a high responsivity of 11.96 A/W, which is 104 times higher than that of oleic acid caped PQDs. Due to the protection of poly(3,4-ethylenedioxythiophene) (PEDOT), the photodetector prepared from EDOT PQDs exhibited very high stability, retaining 94% of its performance after six months in air. This strategy provides a solution for the application of PQDs in high performances and stable optoelectronic devices.
基金
This work was supported by the National Natural Science Foundation of China(Nos.21676093,21776092,21978087,21838003,and 91834301)
the Shanghai Scientific and Technological Innovation Project(Nos.19JC1410400 and 18JC1410600)
Shanghai Rising-Star Program(No.18QA1401500)
the Innovation Program of Shanghai Municipal Education Commission,Program for Professor of Special Appointment(Eastern Scholar)at Shanghai Institutes of High Learning,Shanghai Rising-Star Program(No.18QA1401500)
the Fundamental Research Funds for the Central Universities(No.222201718002).
