Research Of The High-efficiency Polymer Solar Cells By Doping Quantum Dot

Quantum dots have the characteristics of small size effect,quantum confinement effect and multi-exciton effect.In order to study the effect of quantum dot doped for polymer solar cells,In this paper,quantum dots are added to the active layer of solar cells and investigate the effect different proportions and different synthetic conditions of quantum dots for the P3HT:PCBM film and the performance of the solar cell.The graphene quantum dots(GQDs)and Fe3O4 quantum dots are selected as doping quantum dots,and the P3HT:PCBM film is characterized by polarizing microscope,atomic force microscope,transmission electron microscope,X-ray diffraction and UV-vis absorption spectrum.The current density voltage(J-V)of solar cells is tested by Keithley2636 dual channel current voltage tester.It shows that the GQDs are in favor of surface morphology and the UV-vis absorption spectrum of active layer P3HT: PCBM,at the same time,the solar cells performance is also improved.Meanwhile,the photoelectric conversion efficiency is increased by 39.08% when GQDs with mass fraction of 0.2% is added,and the GQDs are synthesized in 200 ? for 6 h,the fill factor is increased by 21.09%.Besides,the Fe3O4 quantum dots on the active layer of P3HT: PCBM film has a role in regulating.The active layer of P3HT: PCBM surface roughness is reduced by 41.37% when the mass fraction of 1% is mixed,and photoelectric conversion efficiency is 1.24%,increased by 7.8%.