Synthesis Of Four Architectures1-D ZnO Nanostructures And Application In The Quantum Dot-sensitized Solar Cells

Recently quantum dot-sensitized solar cells(QDSCs) have been paid attentions by lotsof researchers for its great stable sensitizer which would not be decomposed with timeelapsing. One-dimensional ZnO nanomaterials play a very important role in sensitizedsolar cells for its relatively high conductivity that can provide a electronic channeldirectly.In this article, hydrothermal method was employed, and four architecturesassembled by one dimensional ZnO nanostructures were synthesised through differentexperimental parameter. After SLAR process we obtained a certain amount of CdSquantum dots layer, and systematically studied the performances of these basedsensitized solar cells. The main contents are list as follows:①Use5mM zinc acetate solution for breeding,including zincnitrate,HMTA，PEI and ammonium hydroxide as the growth-promoting media, toget samples by controlling of different growth temperature and time. Put thesamples by XRD, SEM, EDS and so on, the results showed that the four samples arewurtzite structure of ZnO nanorods, nanotubes array, forests, and nanowire arraystructure pyramid, respectively.②Use ion adsorption-chemical deposition method, by controlling the numberof adsorption-reaction to get a different amount of inorganic CdS quantum dots.Through the preparation of the battery and take the conversion efficiency of thebattery as the indicator, measuring the optimum sedimentary samples of differenttimes. The number of the best deposition is40,35,30,30corresponding to the ZnOnanorods, nanotubes, forests, and nanowire array structure pyramid. Based on thedifferent deposition amount of ZnO nanorod array of dark current performanceanalysis of the battery indicates the composite reaction between photoproductionelectronic and electrolyte mainly occurs on the surface is not the CdS deposition ofthe surface of the ZnO.③Use4kinds of architecture of ZnO one-dimensional nanomaterials as thesensitizing light anode of the battery, prepared of the sensitized solar cells, and gotthe best quantum dots under the deposition of conversion efficiency of solar cell,respectively, ZnO nanorod array:0.50%, ZnO nanotube arrays:1.08%, ZnO nanoparticles forest:1.34%, ZnO construct pyramid:1.60%.④Through to the frame of four kinds of pure ZnO samples light absorption andreflection spectrum analysis indicate that ZnO line construct pyramid has a relativelyhigh light absorption property and good ersisting feature. By the analyze of thesamples tested BET show that ZnO pyramid structure has high specific surface area andporosity. And such characteristics have an advantange of quantum dot deposition andlight absorption. By the best deposition amount of CdS4kinds of ZnO samples for lightabsorption spectrum analysis of the architecture indicate that ZnO line composepyramid structure with CdS quantum dots with higher light absorption properties, and itis more advantageous to the generation of optoelectronic.⑤By the test and analysis of the dark current, voltage light attenuation andphotoelectron lifetime curve of the ZnO batteries based on the4kinds ofone-dimensional, show that based on ZnO line structure of the pyramid inorganic CdSquantum sensitized solar cell has the smaller dark current characteristics and long life ofphotoelectron. These suggest that ZnO line construct pyramid structure can betterdeposition inorganic CdS quantum dots on the surface, thus reducing the compositionof photoproduction electronics in the ZnO surface and the electrolyte.⑥Through the analysis of the above features, we draw a conclusion that based ona one-dimensional ZnO materials of inorganic quantum dot sensitized solar cells, bydifferent one-dimensional structure to obtain larger specific surface area and controllingthe precipitation amount of CdS to reduce the composite between the photoproductionelectronic and electrolyte can be extremely effective improve the conversion efficiencyof solar cells.