Synthsis And Performance Of TiO₂ Photoelectric Conversion Materials

Water solar splitting and solar cells transform solar energy into chemical energy and electric energy by absorbing and converting photons to electrons,which would partly replace traditional energy to improve the energy structure and reduce the environmental pollution.This disseration researchs on the fabrication of new photoelectrocatalysis and quantum dots/dye sensitized solar cell,and their photoelectronic conversion performance as follows.Firstly,graphitic carbon nitrides?g-C3N4?was composited on TiO₂ nanowires by solvothermal methods.The TiO₂@ g-C3N4 exhibited the maximum soalr absorbtion of TiO₂ nanowires at 4 hours modification,and TiO₂@ g-C3N4 got the champion transient photocurrent response.Secondly,CuGaS2 quantum dots anchored on TiO₂ nanocrystals by a vacuum one-pot nanocasting process without any long ligands.The CuGaS2 quantum dots and dye bilayer-sensitized solar cells exhibited power conversion efficiency of 23% higher than the single-dye-sensitized solar cells.Finally,pigments of Forsythia were extracted as the sensitizer of solar cells.Ultraviolet-visible absorption spectra and J-V curve confirmed that the photoelectric conversion efficiency of forsythia DSSC reached 0.79%,and the efficiency was stable after 130 cycle testing,which open up new space for photoelectronic conversion application.