Enhancing photo-induced ultrafast charge transfer across heterojunctions of CdS and laser-sintered TiO2 nanocrystals.

摘要: Enhancing the charge transfer process in nanocrystal sensitized solar cells is vital for improvement of their performance. In this work we show a means increasing photo-induced ultrafast successive ionic layer adsorption and reaction (SILAR) CdS–TiO2 heterojunctions using pulsed laser sintering TiO2 nanocrystals. The enhanced was attributed to both morphological phase transformations. At sufficiently high fluences, volumetrically larger porous networks metal oxide were obtained, thus density electron accepting states. Laser also resulted varying degrees anatase rutile transformation TiO2, producing thermodynamically more favorable conditions by change free energy between CdS donor acceptor Finally, report aspects apparent hot as result SILAR which allows be directly adsorbed surface.