Recently, Jiangsu University of Science and Technology, Longi Green Energy Technology Co., Ltd., and Curtin University in Australia have entered into a tripartite cooperation.For the first time in the world, a crystalline silicon heterojunction solar cell with high flexibility and high power-to-weight ratio was produced.Relevant research results were published in the international journal "Nature".
"The crystalline silicon cells we develop are only 50 microns thinnest, thinner than A4 paper, can be bent into a roll, and are more efficient than traditional crystalline silicon cells. "Professor Li Yang from Jiangsu University of Science and Technology told reporters.
Li Yang introduced that crystalline silicon solar cells use silicon as the main material and are currently the most mature and widely used photovoltaic power generation technology. However, crystalline silicon cells also face two major technical bottlenecks: First, the photoelectric conversion efficiency of large-area crystalline silicon cells is difficult to exceed 26%; second, the thickness of currently more advanced crystalline silicon cells is generally 150 microns to 180 microns, which is difficult to apply to sea-surface floating photovoltaics, curved roofs, satellites, space stations and other scenarios that require high material weight or flexibility.
In this study, the three-party team developed new processes such as surface interface passivation and doped contact growth.Test results show that five products with thicknesses ranging from 57 microns to 125 microns all achieved conversion efficiencies of more than 26%, with the highest reaching 26.81%. Among them, this 57-micron-thick battery has a battery power-to-weight ratio of 1.9 W/g and a curvature radius of 19 mm. The power-to-weight ratio is 2-3 times that of existing products on the market. The relevant data has been certified by the German Hamelin Solar Energy Research Institute, an authoritative testing organization.