Key Findings
LONGi Green Energy Technology Co. Ltd. (LONGi) has announced a monumental achievement: its crystalline silicon-perovskite tandem solar cell has been certified by the U.S. National Renewable Energy Laboratory (NREL) with a groundbreaking 35.5% power conversion efficiency. This sets a new world record, significantly surpassing the efficiency limits of conventional single-junction silicon solar cells and marking a pivotal milestone in the development of next-generation photovoltaic technology. The certified record underscores LONGi’s leading position in solar innovation.
Technical and Manufacturing Details
- Crystalline Silicon-Perovskite Tandem Structure: The tandem solar cell developed by LONGi employs a layered architecture where a perovskite thin film is deposited on top of a high-performance crystalline silicon solar cell. The perovskite top cell efficiently absorbs the high-energy photons in the blue and green parts of the solar spectrum, while the bottom silicon cell captures the lower-energy photons, particularly in the infrared range. This complementary absorption allows for a broader and more efficient utilization of the solar spectrum, leading to a synergistic increase in overall conversion efficiency.
- Significance of NREL Certification: NREL is a globally recognized authority in photovoltaic device performance measurement and certification. The 35.5% certification by NREL provides independent validation of the record’s accuracy and scientific credibility, affirming LONGi’s technological prowess on an international stage.
- Preceding Efficiency Records: This latest achievement builds upon LONGi’s previous successes, including a 33.5% tandem efficiency certified by the European Solar Test Installation (ESTI) and a 26.81% record for silicon heterojunction cells. These consistent breakthroughs across various solar cell technologies highlight the company’s robust and continuous investment in advanced R&D.
Background and Context
Solar photovoltaics are a cornerstone of the global energy transition, yet conventional silicon technology is nearing its theoretical efficiency limits. To further reduce the levelized cost of electricity (LCOE) and enhance the performance of solar installations, next-generation technologies are essential. Perovskite-silicon tandem solar cells are considered the most promising solution to these challenges due to their high efficiency potential. The aggressive investment and consistent record-breaking achievements by major manufacturers like LONGi indicate the rapid maturation of this technology and a strong intent for commercialization.
Strategic Significance and Outlook
LONGi’s attainment of 35.5% conversion efficiency is a major step in the transition of perovskite-silicon tandem solar cells from laboratory research to commercial production. As this high-efficiency technology scales to mass manufacturing and addresses long-term stability challenges, the cost-performance ratio of solar power is expected to improve dramatically. This will lead to higher power output per unit area, accelerating solar deployment in space-constrained regions and high-demand energy markets. LONGi’s achievement is poised to be a significant driving force towards meeting global renewable energy targets.
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