Xi'an Jiaotong University made important progress in the research of lead-free perovskite solar cells

Based on methylammonium lead-iodide perovskite solar cells is a new star in the photovoltaic field, its conversion efficiency from 3% in 2009 to 22% in 2016, its efficiency in just seven years progressed comparable to dozens of other types of solar cells The development of the year has become a focus of international scientific research and industry. However, the toxicity of lead and damage to the environment have become one of the factors restricting its development. Therefore, the development of non-lead perovskite solar cells is of great significance. For non-lead perovskite films (tin-based perovskites, etc.), their crystallinity, film morphology, and defects are more difficult to control, and these defects are important factors that cause their performance to be destroyed. Therefore, high-quality, low-defect non- The preparation technology of lead perovskite (tin-based) thin films is the key to breaking through its development.

In response to the above-mentioned important scientific issues and technical difficulties, Prof. Wu Chaoxin of the Xi'an Jiaotong University College of Telecommunications led a team to systematically develop new high-quality perovskite film preparation technologies, dynamic processes, and high-performance non-lead perovskite solar cells. Internationally, it has taken the lead in the development of "evaporation-spin coating" perovskite thin film preparation technology, and successfully solved the bottleneck of tin-based perovskite film formation based on this "evaporation-spin/soak" thin film preparation technology. To achieve high-quality and low-defect tin-based perovskite films, it has been reported for the first time in the world that the photoconversion efficiency of a flexible device with a methyl gallium tiniodide perovskite solar cell at room temperature is 3.98%. The research results have recently been published in the world's top journal, Advanced Materials (IF 18.96).

This work was highly praised by reviewers and considered it to be “one of the most effective methods to solve the current non-lead (tin-based) perovskite film and its battery bottleneck” and “to achieve higher efficiency tin-based perovskite solar energy. The basics of the battery." The first author of this article is Xi'an Jiaotong University. Prof. Wu Chaoxin is the author of the communication responsibility. The first author is his doctoral student Jun Jun. At the same time, Prof. Merouri of Northwestern University also participates in some of the work. This work was completed under the support of the national major scientific research project and the National Natural Science Foundation of China.