Chinese Academy of Sciences has made new progress in the research of solar cell materials and devices

The development of low-cost, new-type solar cell key materials and high-performance devices is the key to large-scale development of solar cells to solve future social energy problems, and is also one of the hotspots and difficulties in this area of ​​research. With the support of the National Natural Science Foundation of China, the Ministry of Science and Technology and the Chinese Academy of Sciences, researchers at the Molecular Nanostructures and Nanotechnology Key Laboratory of the Institute of Chemistry, Chinese Academy of Sciences recently designed and constructed efficient quantum dot sensitization based on three-dimensional conductive networks and assembly structures. New advances have been made in the research of solar cell materials and low-cost thin-film solar cell materials.

An ITO@Cu2S nanowire array assembled from an ITO nanowire core layer and a Cu2S nanocrystalline shell layer was designed and fabricated. The quantum dot sensitized solar cell fabricated using this material having a three-dimensional conductive network structure exhibited superiority to conventional materials. The excellent properties (Nano Lett., 2014, 14, 365); The effect of the interface between the ITO nanowire core layer and the Cu2S nanocrystalline shell layer on the performance of the battery in the assembled structure is optimized by optimizing the construction method of the Cu2S nanocrystalline shell layer. , further improving the conversion efficiency of the battery (ACS Appl. Mater. Interfaces, 2014, 6, 15448); based on this, through the networked multi-stage assembly design, the secondary structure of ITO@Cu2S nanowires is based on the secondary The assembly with the tertiary structure further improves the conversion efficiency of the quantum dot-sensitized solar cell using this counter electrode material to 6% or more. This new type of counter electrode material can effectively form a tunnel junction when the battery is in operation. By reducing the series resistance of the device and improving the shunt resistance and fill factor, the conversion efficiency of the battery is greatly improved, and the conventional copper/sulfide copper is easily resolved. Problems that cannot be stabilized (Nano Lett., 2015, 15, 3088).

Exploring low-cost thin-film solar cell materials is the only way for future large-scale utilization of solar power. FeS2 is a kind of material that is non-toxic and abundant in its composition. It has a suitable forbidden band width, light absorption coefficient, and sufficient carrier diffusion length. Therefore, FeS2 is an ideal low-cost environmentally friendly thin-film solar cell material. one. One of the keys to its ultimate application is to develop a low-cost synthesis method to prepare a pure cubic phase FeS2 material that is stable in the air. Recently, nanolab researchers successfully developed a method for the preparation of stable, pure cubic phase FeS2 micro and nanomaterials in air based on solution-phase orientation aggregation pathways. It was found that the spherical-like FeS2 nanocrystals, FeS2 nanocubes, and microspheres assembled from FeS2 nanocrystals can be controlledly prepared by solvent induction. The use of spherical aberration correction electron microscopy and other techniques clearly characterizes the growth of the orientation and aggregation of the initial nanocrystalline grains of FeS2. Systematic studies of Raman spectroscopy have shown that a variety of morphologies of FeS2 materials that are stable in the air for at least 1 year can be obtained by selecting suitable solvents, laying the foundation for further research on low-cost thin-film solar cells based on FeS2 materials (J. Am Chem. Soc., 2015, 137, 2211).

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