LONGi Leads Breakthrough in Flexible Tandem Solar Module Technology, Selected as Top 10 Scientific Advances in China
Veröffentlichungsdatum:
2026-02-27
BEIJING, March 26, 2026 — At the opening of the 2026 Zhongguancun Forum Annual Meeting, the "High-Efficiency and Stable Flexible Perovskite-Silicon Tandem Solar Cell Technology", jointly developed by LONGi Green Energy Technology Co., Ltd. and Soochow University, was officially listed in the "Top 10 Scientific Advances in China in 2025". This milestone marks a major breakthrough in China’s next-generation photovoltaic core technology and stands as one of Shaanxi Province’s two selected major scientific advances this year.
The annual forum, themed "In-depth Integration of Technological Innovation and Industrial Innovation", highlighted the achievement as a model of industry-university-research integration and collaborative innovation. LONGi is currently the world’s only photovoltaic enterprise with the capability to manufacture wafer-sized ultra-thin flexible tandem batteries.
Traditional monocrystalline silicon batteries have approached the theoretical efficiency limit of 29.4% in laboratory settings. Combining perovskite materials with silicon to form a tandem structure enables full utilization of different wavelengths of sunlight, with a theoretical efficiency of over 43%, widely recognized as a next-generation disruptive photovoltaic technology. Among them, flexible tandem batteries based on ultra-thin silicon wafers, with their exceptional light weight and bendability, are expected to unlock cutting-edge applications such as wearable devices and building curved-surface photovoltaics.
However, repeated bending and temperature changes during use easily lead to interface delamination and failure of flexible devices, whose stability and service life are far inferior to rigid devices, long restricting their commercialization. To address this core challenge, teams led by Li Zhenguo, Xu Xixiang, He Bo from LONGi, and Zhang Xiaohong, Liu Jiang from Soochow University, innovatively designed a "one tight, one loose" double buffer layer structure. The loose layer absorbs and dissipates strain energy like a spring mattress to relieve mechanical stress, while the dense layer ensures efficient interface charge extraction and stable connection.
The ultra-thin flexible tandem battery (about 60 microns) prepared based on this technology has achieved a certified efficiency of 33.4% in laboratory size by the U.S. National Renewable Energy Laboratory (NREL), and 29.8% in full silicon wafer size, both setting world records for this type of device. Its power-to-weight ratio reaches as high as 1.77 watts per gram, showcasing significant lightweight advantages. Industry insiders believe this achievement will effectively drive China’s photovoltaic industry from "efficiency leadership" to "scenario leadership", contributing Chinese wisdom to the global energy transition.
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