Website news (Correspondent: Wu Li): Prof. Fang Guojia’s team at School of Physical Science and Technology, in a collaboration with WHU alumnus Prof. Yan Yanfa of University of Toledo, has made important progress in high-efficiency low-cost simple-structure perovskite photovoltaic cell research. The result is published online at Nature Communications on March 23.
The paper is titled “Efficient hole-blocking layer-free planar halide perovskite thin-film solar cells”, with the first author being Ke Weijun, a Class of 2013 doctorate student of School of Physical Science and Technology, WHU/
As is widely known, traditional energy reliant on fossils have caused smog and other more severe environmental problems. As an ideal source of clean energy, the efficient conversion of solar energy into other forms has always been a core issue in energy research. Discovered in recent years, perovskite solar cells immediately captured the attention of worldwide researchers due to its unique physical properties, remarkable efficiency and great potential use.
Low temperature, simple structures and low costs have always been the holy grails of energy industry. The energy materials and semiconductor research team led by Prof. Fang discovered a hole-blocking layer-free iodine-chloride system perovskite solar cell with a simple structure (see attached figure), and systematically studied its mechanism and properties. Based on semiconductor interface technology and energy band theory, they employed two technologies – ultraviolet ozone surface treatment and chloride interface passivation, and obtained high open circuit voltage and photovoltaic efficiency for the first time.
The technology marks a break from tradition high-efficiency solar cells, which generally require a hole-blocking layer, and is significant to our understanding of perovskite’s mechanism. Despite the extremely simple structure, the cell can achieve high conversion efficiency. Moreover, its preparation temperature does not exceed 100 celsius degrees, making it suitable for soft substrates such as plastics. This laid the practical foundation for the large scale low-cost production of perovskite cells.
According to researchers, the work has received the support from the Ministry of Science and Technology of China, and Chinese Natural Science Foundation. Their applications for intellectual properties are under review.
Structure diagram and current-voltage plots with/without incident light for the perovskite thin-film cell
(Edited by: Xiao Shan)