Anhui hefei material science research institute, Chinese academy of sciences institute of optical precision machinery laser technology center researcher xiao-dong fang group in quantum dot sensitized solar cell (QDSCs) research progress, the related research results with A new probe into thin copper sulfide counter electrode with thickness below 100 nm for quantum dot - sensitized solar cells issues are published in the journal journal of the electrochemical (Electrochimica Acta 45-52), 205 (2016).
QDSCs is has a broad prospects for development of the third generation solar cells, and the electrode as an important part of QDSCs, have the effect of promoting charge transport, accelerate electrolytic reduction. Copper sulfide (CuS) because of its high conductivity and catalytic activity, is widely applied in QDSCs study of electrode. Currently used CuS most of the electrode thickness for a few hundred nanometers to a few microns, rarely make the news thickness below 100 nm on the electrode. To reduce the thickness of the electrode has a lower cost, improve the catalytic material and the advantages of the adhesion strength of the base, therefore, under the premise that the catalytic activity is, the thickness of the thinner of the electrode.
The group using a simple chemical bath prepared a series of CuS thin film thickness below 100 nm, studied the different precursor solution concentration on the film thickness, surface roughness, and the influence of resistivity. On this basis, the CuS thin films with different thickness as A kind of electrode used in CdS/CdSe quantum dots sensitized QDSCs, studied their effects on the performance of QDSCs rule, it is found that the thickness is only around 64 nm CuS of electrode (CS) 2.5 assembly of QDSCs won 3.25% of the photoelectric conversion efficiency (as shown in figure (A), is better than that of Pt electrode (1.91%) and the thickness of the coating method 2.8 mu m CuS of electrode (CS - DB, 2.15%), the currently reported to use such A thin CuS to obtain the highest efficiency of the electrode in QDSCs. Electrochemical impedance spectroscopy (EIS) as shown in figure B, Tafel polarization curve and cyclic voltammetric curves (CV) and electrochemical tests show that this kind of thin CuS of electrode has higher catalytic activity and stability.
The research work has been the national natural science foundation of China and the Chinese academy of sciences new thin film solar cell key laboratory support.
