SYNTHESIS OF NOVEL FUNCTIONALIZED-GRAPHENE/QUANTUM DOTS HYBRID SYSTEM FOR SOLAR CELLS APPLICATION

摘要

The present work demonstrates the synthesis of a novel hybrid accepter material containing amino-functionalized graphene oxide and an inorganic semiconducting material, Cadmium Selenide (CdSe). First, amino-functionalized graphene was synthesized and then nanocrystals (NCs) of CdSe were in-situ grown in the functionalized-graphene oxide matrix named f-GCdSe. Structural studies like X-ray diffraction (XRD), Scanning Electron Microscopic (SEM) were employed to investigate the growth of CdSe NCs in graphene matrix. To understand the charge generation and transfer process at the donor/acceptor interface, the absorption, photoluminescence (PL) and transient absorption spectroscopic (TAS) studies have been carried out in poly(3-hexylthiophene) (P3HT)/f-GCdSe thin films. PL quenching in P3HT/f-GCdSe thin film suggests that charge transfer at the donor/acceptor interface. TAS shows higher optical density and longer lived free carriers for P3HT/f-GCdSe thin film. These results suggest that f-GCdSe is an excellent electron acceptor material for OPV devices.