Adv. energy mater.: the research group of clean energy materials and devices in the school of materials science and engineering of East China University of science and technology has made the latest progress in the stability of perovskite solar cell devices

Recently, adv energy material reported on-line the stability of clean energy materials and devices research group of East China University of science and technology in perovskite solar cell devices under the title of "surface electronic modification of Perovskite Thin film with water resistant electron delocalized molecules for stable and efficient photonics" The latest research progress The development of efficient and stable photovoltaic technology is an effective way to solve the world energy crisis and environmental protection problems As one of the top ten scientific breakthroughs in 2013 selected by science magazine, the photoelectric conversion efficiency of organic-inorganic hybrid perovskite solar cells has exceeded 22% in just a few years, which has been widely concerned by researchers However, the poor stability of perovskite material greatly restricts its large-scale commercial development Especially in the humid environment, perovskite materials will react with water molecules in the air, which leads to the rapid degradation of solar cell device performance Therefore, how to improve the stability of perovskite materials is an important challenge in this field Photo caption: with the aid of functionalization of thiophene group on the surface of perovskite crystal, the source of improving the device stability: adv energy mate., 2018, 10.1002/aenm.201703143 This research work innovatively proposes the strategy of using molecules containing conjugated groups to regulate the surface electronic structure Based on the surface characteristics of perovskite materials, a group of thiophene derivatives with conjugated and hydrophobic groups were used to modify the surface of perovskite materials for the first time The electronic structure of perovskite materials was controlled, carrier transport was accelerated, surface defects were passivated, and humidity stability of battery devices was greatly enhanced At the same time, in 50% relative humidity environment, the 30 day stability test efficiency decay is also within 20%, while the untreated perovskite solar cell efficiency decay is more than 90% in 7 days This research result opens up a new idea of electronic control on the surface of perovskite materials, and provides an important method for the development of high-efficiency and stable new solar cells The work was completed by Wen Tianyu, a master of the school of materials, under the guidance of Hou Yu, an associate researcher, and Professor Yang Huagui The research was supported by the project of young talents trust of China Association for science and technology, the project of youth fund of National Natural Science Foundation of China, the project of morning light of Shanghai, the project of young talents of science and technology of Shanghai, and the special program of East China University of science and technology Paper link: http://onlinelibrary.willey.com/doi/10.1002/aenm.201703143/full profile of Professor Yang Huagui: http://clxy.security.edu.cn/2012/0224/c4681a36527/page.htm Professor Yang Huagui