Research Center of Functional Thin Films, Laser Technology Center, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences The distribution of quantum dots and the CuxS (copper sulfide) counter electrode in quantum dots-sensitized solar cells (QDSCs) photoanodes by Wang Shimao et al. Research made new progress.
In the study of the distribution of quantum dots in QDSCs photoanodes, the researchers studied Cd (cadmium) in TiO2 (titanium oxide) nanoparticles photoanodes co-sensitized by CdS (cadmium sulfide) and CdSe (cadmium selenide) quantum dots. The concentration distribution of S(sulfur) and Se(selenium) elements in the thin film and the average size of the quantum dots in the photoanode with different thickness were established, and the distribution model of quantum dots in the titanium oxide photoanode was established (Fig. 1); The model proposes three ways to optimize the photoanode microstructure of titanium oxide, and optimizes the thickness of titanium oxide photoanodes. The QDSCs prepared using the optimized titanium oxide photoanode and Pt (platinum) counter electrode achieved a photoelectric conversion efficiency of 3.26±0.10%. The research work establishes the distribution model of quantum dots in titanium oxide photoanodes. It is of great value for the further optimization of titanium oxide photoanodes to improve the photoelectric conversion efficiency of QDSCs. The results were published in the Journal of Power Sources (2015, 273, 645-653).
In the research field of QDSCs on electrodes, vacuum thermal evaporation coating (VTE) technology was introduced. CuxS (x=1-2) counter electrodes were fabricated on FTO (fluorine-doped tin oxide) conductive glass substrates. VTE-CuxS was studied. The catalytic activity of the electrode, stability and photovoltaic performance of the battery. The results showed that the catalytic activity (Figure 2) and stability (Figure 3) of VTE-CuxS on the electrode are better than those of Cu2S counter electrode and Pt counter electrode. The research work achieved the preparation of the CuxS counter electrode on the FTO glass substrate, solved the problem that the substrate was easily corroded, and the VTE technology could realize the large-area preparation of the electrode, which could meet the need for commercial production of QDSCs in the future. Research papers were published in Electrochimica Acta (2015, 154, 47-53).
In addition, the research lab has been focusing on the research of new thin-film solar cells such as dye-sensitized solar cells (DSCs) and QDSCs, and the synthesis of one-dimensional arrays of semiconductor nanostructures (nanowires, nanorods, nanotubes, nanoflowers) in recent years. And it has also made a series of progresses in the application of DSCs and QDSCs, and published many research papers, among which are Ti(Ti) wafer substrates for TiO2 nanowire array anodes and FTO substrates rutile phase titanium oxides for back-irradiated DSCs. Progress in research on photoanodes for single crystal nanorod arrays is also published in the Journal of Power Sources (J. Power Sources, 2010, 195, 2989-2995; J. Power Sources, 2013, 235, 193-201).
The above research work was supported by the National Natural Science Foundation of China, the “973†Program and the key laboratory of the new thin-film solar cells of the Chinese Academy of Sciences.
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