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(A) JV curves of three counter electrode QDSCs; (B) Nyquist curves of three counter electrode symmetrical cells
Researcher Fang Xiaodong of the Institute of Laser Technology of Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, has made progress in the research of quantum dot sensitized solar cells (QDSCs). The results of the relevant research were A new probe into thin copper sulfide counter electrode with thickness. The following 100 nm for quantum dot-sensitized solar cells was published in the journal Electromagic Acta 205 (2016) 45-52.
QDSCs are the third generation of solar cells with broad development prospects. The counter electrode, as an important part of QDSCs, plays a role in promoting charge transport and accelerating the reduction of electrolytes. Copper sulfide (CuS) is widely used in QDSCs for electrode research due to its high conductivity and catalytic activity. Currently, the thickness of the CuS counter electrode used is mostly several hundred nanometers to several micrometers, and counter electrodes with a thickness of less than 100 nanometers are rarely reported. Reducing the thickness of the counter electrode has the advantages of reducing the cost and increasing the binding force between the catalytic material and the substrate, and therefore, the counter electrode having a relatively thin thickness is more advantageous under the premise of relatively equal catalytic activity.
The research group used a simple chemical bath method to prepare a series of CuS films with a thickness of less than 100 nm. The effects of different precursor concentration on the film thickness, surface roughness, and resistivity were studied. On this basis, CuS thin films with different thicknesses were used as the counter electrode in the QDSCs co-sensitized by CdS/CdSe QDs, and their influence on the properties of QDSCs was studied. It was found that CuS counter electrodes with thickness of only about 64 nm were used. (CS 2.5) The assembled QDSCs achieve a photoelectric conversion efficiency of 3.25% (as shown in Figure A), better than the Pt counter electrode (1.91%) and a CuS counter electrode (CS-DB) with a thickness of 2.8 μm prepared by a doctor blade method. (2.15%), which is also the highest efficiency reported in QDSCs using such a thin CuS electrode. Electrochemical impedance spectroscopy (EIS shown in Figure B), Tafel polarization curves and cyclic voltammetry (CV) electrochemical tests showed that this thin CuS electrode has a higher catalytic activity and stability.
The above research work was supported by the National Natural Science Foundation of China and the Key Laboratory of Novel Thin Film Solar Cells of the Chinese Academy of Sciences.
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