Abstract: The ZnO quantum dot particles with an average particle size 3 nMAnd the ZnO nanorods with an average length of 80 nMAnd width about 14 nm were synthesized by the sol-gel method.The surface photovoltaic properties of ZnO nanoparticles were investigated by means of FISPS technique and the bandSIn FISPS were identified.The results show that the surface photovoltaic properties of ZnO nanoparticles make a great difference for the structures or sizes due to the quantum confinement effect.The photovoltaic response intensity of ZnO nanorodSIs two-orders of magnitude stronger than that of quantum dot particles.And it is found that the ZnO quantum dot particles exhibit significant quantum confinement properties of photogenerated charges.The photovoltaic response bands of ZnO nanorods are related to band-band transition and bound exciton transition, respectively.

Key words: ZnO nanoparticles, Quantum confinement, Field induced surface photovoltage spectra(FISPS), Excition state