Researchers at Xi'an Jiaotong University took the lead in researching the preparation technology of perovskite film in the world to realize high-quality, low-defect tin-based perovskite film, successfully solving the technical bottleneck of non-lead perovskite solar cells, and the research results were recently published. In the international top journal "Advanced Materials".

Based on methylammonium lead iodine perovskite solar cells , it is a new star in the field of photovoltaics. Its conversion efficiency jumped from 3% in 2009 to 22% in 2016. The progress in just seven years is comparable to other types of solar cells. Ten years of development has become a hot spot in the international research and industrial fields, but the toxicity of lead and damage to the environment has become one of the factors restricting its development. It is of great significance to develop non-lead perovskite solar cells. For non-lead perovskite films (tin-based perovskites, etc.), their crystallization characteristics, film morphology and defects are more difficult to control, and these defects become important factors that cause their performance to be destroyed, so high quality and low defects The preparation technology of non-lead perovskite (tin-based) film is the key to breaking through the bottleneck of its development.

In response to the above problems and technical difficulties, under the support of the National Major Scientific Research Project and the National Natural Science Foundation, Professor Wu Chaoxin from Xi'an Jiaotong University's School of Telecommunications led a team to systematically develop new high-quality perovskite film preparation technology , kinetic process and high. The research on the performance of non-lead perovskite solar cells is the first in the world to adopt the "evaporation-spin coating" perovskite film preparation technology, and based on this technology, the technical bottleneck of tin-based perovskite film formation has been successfully solved. To achieve high quality and low defect tin-based perovskite film, the internationally reported for the first time at room temperature to prepare a bismuth tin iodine perovskite solar cell with a light conversion efficiency of 3.98%.

This research work is highly praised by reviewers as one of the most effective ways to solve the current bottleneck of non-lead (tin-based) perovskite films and their batteries, and is to achieve higher efficiency tin-based perovskites. The basis of solar cells."

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