The "Science" magazine published on July 18th published a full-print mesoscopic perovskite solar cell funded by the Han Hongwei Task Force of Huazhong University of Science and Technology under the funding of the National Natural Science Foundation of China's Youth Fund (project number 61106056). New results of research.
Making full use of solar energy is the fundamental way to solve the current human energy shortages and environmental pollution. As a representative of the third generation of solar cells, new mesoscopic solar cells based on mesoscale-based inorganic or organic semiconductor materials and three-dimensional interpenetrating network structures have attracted the attention of scientific researchers in various countries because they are expected to achieve low-cost energy. Especially in the past two years, with the application of perovskite materials such as MAPbI3 (lead dimethylamine), this mesoscopic solar cell has developed at an extraordinary speed, and the photoelectric conversion efficiency has rapidly increased from 3.8% to 17.9%. Good application prospects.
Unfortunately, the organic hole transport material and gold counter electrode used in solar cells with this efficiency are not only expensive (it is reported that the price of the organic hole transport material spiro-OMeTAD is 10 times that of gold or platinum), and it needs to be high. Vacuum and other high-energy processing processes. Therefore, how to achieve an all-solid-state mesoscopic solar cell with high efficiency and stability under low-cost conditions is still a key issue for large-scale solar energy applications.
Drawing on the development of perovskite solar cells, Han Hongwei's research group developed a mixed cationic perovskite material (5-AVA) x (MA)(1-x)PbI3 (lead iodide methylamine-5-amino group) by introducing amphipathic molecules. Valeric acid) and its application in no-hole transport material printable mesoscopic solar cells. The feature is that a titania nanocrystalline film, a zirconia insulating layer and a carbon counter electrode layer are coated on a single conductive substrate by a layer-by-layer printing method, and then filled with a perovskite material.
This key technology enables a perfect combination of low cost and continuous production processes for mesoscopic solar cells. The results show that the application of this new material not only obtained a photoelectric conversion efficiency of 12.84%, but also showed good repeatability and stability. The photoelectric conversion efficiency was certified by the independent photovoltaic laboratory of Newport Company in the United States, which is the highest efficiency of the perovskite ore cell with no hole transport material in the world.
The full-print mesoscopic solar cell developed by Han Hongwei's research group has adapted to the photovoltaic industry's demand for cheap solar cells. Reviewers commented that this breakthrough research result will have a huge impact on the future development of solar cells.
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