The large-area perovskite solar cell independently researched and developed by Chen Wei, an associate professor of optoelectronic national laboratory of Huazhong University of Science and Technology, has been certified by the Institute of Photonics Technology of Japan (AIST) and achieved the highest international efficiency of 15%, filling the solar cell efficiency record. The blank of the table. The results were published in Science recently. AIST is one of the most authoritative solar cell certification agencies in the world. The large-scale perovskite batteries submitted by Chen Wei were successfully certified as 15% of the highest international efficiency at the Institute. The result was first written by Martin Green, the “Father of Solar Cellsâ€, into an authoritative solar cell efficiency record compiled by it. Perovskite solar cells are a new type of photovoltaic technology that has emerged in recent years, and its efficiency record has been increasing rapidly. Perovskite materials have the characteristics of rich raw materials, low cost, excellent photoelectric properties, solution processing, and low temperature preparation. However, perovskite solar cells generally suffer from stability problems, and many batteries have decayed during the test. In addition, perovskite solar cells are also generally subject to hysteresis. Chen Weihe's team tested tens of thousands of battery current/voltage output characteristic (IV) curves. After comparing several of the most common perovskite solar cell structures, it was found that “PiN†transplanar structure batteries can more easily eliminate hysteresis. . Through the implementation of the interface project, Chen Wei successfully increased the efficiency of the small area (0.09 cm 2 ) battery of the “PiN†structure to 18.3%, and the efficiency of the large area of ​​1.02 cm 2 battery was improved to 16.2%, and whether it is a small battery or a large battery The hysteresis effect of the IV test is very small. At the same time, the device exhibits the best stability of all types of perovskite solar cells to date. Chen Wei said that by further improving the quality and composition of perovskite films, the efficiency record of large-scale perovskite solar cells is expected to advance to the 20% level.
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