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High-quality CdS quantum dots sensitized zno nanotube array films for superior photoelectrochemical performance

Chinese Physics B 2022年第9期31卷 561-569页

作者：宫倩倩赵云龙张奇胡春永刘腾飞张海峰尹广超孙美玲 School of Physics and Optoelectronic Engineering Shandong University of TechnologyZibo 255000China

The surface characteristics of zno were synthetically optimized by a self-designed simultaneous etching and W-doping hydrothermal method utilizing as-prepared zno nanorod(NR)array films as the *** from the etching and regrowth process and the different structural stabilities of the various faces of zno NRs,the uniquely etched and W-doped zno(EWZ)nanotube(NT)array films with larger surface area,more active sites and better energy band structure were used to improve the photoelectrochemical(PEC)performance and the loading quality of CdS quantum dots(QDs).On the basis of their better surface characteristics,the CdS QDs were uniformly loaded on EWZ NT array film with a good coverage ratio and interface connection;this effectively improved the light-harvesting ability,charge transportation and separation as well as charge injection efficiency during the PEC ***,all the CdS QD-sensitized EWZ NT array films exhibited significantly enhanced PEC *** CdS/EWZ-7 composite films exhibited the optimal photocurrent density with a value of 12 mA·cm^(-2),2.5 times higher than that of conventional CdS/zno-7 composite films under the same sensitization times with CdS *** corresponding etching and optimizing mechanisms were also discussed.

关键词： zno nanotubes W-doping CdS quantum dots

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Photoanode Activity of zno Nanotube Based Dye-Sensitized Solar Cells

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Journal of Materials Science & Technology 2011年第11期27卷 961-966页

作者： R. Ranjusha P. Lekha K.R.V. Subramanian V. Nair Shantikumar A. Balakrishnan Nano Solar Division Amrita Center for Nanosciences

Vertical zno nanotube （ZNT） arrays were synthesized onto an indium doped tin oxide （ITO） glass substrate by a simple electrochemical deposition technique followed by a selective etching process. Scanning electron microscopy （SEM） showed formation of well-faceted hexagonal ZNT arrays spreading uniformly over a large area. X-ray diffraction （XRD） of ZNT layer showed substantially higher intensity for the （0002） diffraction peak, indicating that the zno crystallites were well aligned with their c-axis. Profilometer measurements of the ZNT layer showed an average thickness of -7 μm. Diameter size distribution （DSD） analysis showed that ZNTs exhibited a narrow diameter size distribution in the range of 65-120 nm and centered at -75 nm. The photoluminescence （PL） spectrum measurement showed violet and blue luminescence peaks that were centered at 410 and 480 nm, respectively, indicating the presence of internal defects. Ultra-violet （UV） spectroscopy showed major absorbance peak at ,-348 nm, exhibiting an increase in energy gap value of 3.4 eV. By employing the formed ZNTs as the photo-anode for a dye-sensitized solar cell （DSSC）, a full-sun conversion efficiency of 1.01% was achieved with a fill factor of 54%. Quantum efficiency studies showed the maximum of incident photon-to-electron conversion efficiency in a visible region located at 590-550 nm range.

关键词： zno nanotubes Indium doped tin oxide (ITO) glass Photoluminescence spectra Electrochemical deposition Quantum efficiency

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