Well-aligned CdS/TiO2 nanotube array composite film was fabricated on the indium-doped tin oxide(ITO) substrate by templating ZnO nanorod array film.The effects of CdS deposition time on the morphology,crystal structure,photo-electric properties of TiO2/CdS composite film were investigated via scanning electron microscopy(SEM),X-ray diffraction(XRD),ultraviolet-visible absorption spectrum(UV-Vis) and surface photovoltage spectrum(SPS).The results showed that the absorbance of composite film extended to the visible region compared with the pristine TiO2 nanotube arrays.The SPS also showed a new response region relative to the absorption spectrum.This result indicated a remarkable photo-electric conversion efficiency improvement in the visible region.We also found that the SPS response intensity of composite film decreased gradually in the visible region with the increase of CdS deposition time.We interpreted and discussed this phenomenon using distinct photo-induced charge generation and transfer mechanisms detailedly.Despite this,we also discussed the influence of surface-to-volume ratio on the final photo-electric properties for the CdS/TiO2 nanotube array composite film.

Well-aligned ZnO/CdS composite nanorod array film was grown on an indium tin oxide (ITO) substrate by two-step chemical solution deposition method. The effects of CdS deposition time on the crystal structure, morphology, and photoelectric performance of the ZnO/CdS composite film were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet. visible absorption spectroscopy (UV-Vis), photoluminescence spectroscopy (PL), and surface photovoltage spectroscopy (SPS). Results showed that the absorbance of the composite film extended into the visible region compared with the bare ZnO nanorod arrays. SPS also showed a new response region corresponding to the absorption spectrum. This result indicated a remarkable photoelectric conversion efficiency improvement in the visible region. We also found that the SPS response intensity of the composite film decreased gradually above 383 nm with an increase in CdS deposition time. However, the SPS response intensity increased below 383 nm. We interpreted this phenomenon using two distinct photoinduced charge generation and transfer mechanisms.

Two different microstructures were constructed on the single crystalline silicon surface which was used as antireflection coatings. The reflection spectra show that these period microstructures have an antireflection effect in some regions of the spectrum. The surface photovoltaic spectra show a corresponding photovoltaic enhancement in these spectrum regions. The antireflection mechanism was also discussed. This antireflection coating technique can be used to product and design the single crystalline silicon solar cells for high photoelectric conversion efficiency.

The ZnO nanowires (NWs) array/poly(3-hexylthiophene) (P3HT) hybrid prototype device was fabricated. An ultraviolet (UV) light of λ=350nm is used to investigate the photo-electric properties of the ZnO NWs array and hybrid structure. In this way, we can avoid the excitation of P3HT, which can give us a real electron transport ability of ZnO NWs itself. Our results demonstrated a higher and faster photo-electric response of 3s for the hybrid structure while 9s for the ZnO NWs array. The surface states related slow photo-electric response was also observed for them. The charge transfer mechanism and the influence of surface states were discussed. The current work provides us profound understandings on the electron transport ability of ZnO NWs array in a working hybrid polymer solar cell, which is crucial for optimizing the device performance.