Solar energy continues to push back the boundaries of innovation, and China has just achieved a major milestone by setting an impressive world record. This significant advance marks a turning point in the renewable energy sector, underlining the country’s growing commitment to sustainable solutions.
As the world seeks to reduce its dependence on fossil fuels, this achievement could well redefine the standards of clean energy production on a global scale. Find out how this technological feat could influence the future of energy, and inspire other nations to follow this ambitious example.
LONGi’s Technological Advances in Tandem Solar Cells
LONGi, a Chinese company specializing in solar technology, has recently achieved a major milestone in solar cell research and development. By developing a two-terminal tandem cell combining crystalline silicon and perovskite, LONGi has achieved a conversion efficiency of 34.85%, confirmed by the US National Renewable Energy Laboratory (NREL).
This breakthrough surpasses the traditional limits of single-junction solar cells, whose maximum theoretical efficiency is 33.7%. With a theoretical potential of 43%, these tandem cells represent the future of ultra-efficient solar technologies, consolidating LONGi’s position as a leader in photovoltaic innovation.
Passivation Strategies and Load Extraction Optimization
LONGi has implemented an innovative bilayer interface passivation strategy for its tandem solar cells, maximizing electron transport while effectively blocking holes. This approach is based on the integration of a thin layer of lithium fluoride (LiF) and ethylenediammonium diiodide (EDAI) molecules.
Although thickening the LiF layer can improve passivation, it also leads to undesirable resistive losses. On the other hand, EDAI molecules can chemically passivate areas not covered by LiF, creating localized contacts at the perovskite/C60 interface. This compromise between passivation and charge extraction optimizes cell performance, strengthening LONGi’s position in the photovoltaic field.
Cost reduction and automation in production
LONGi has succeeded in considerably reducing solar cell production costs through the adoption of innovative processes such as high loading, high pulling speed and multiple pulling. These techniques, combined with improved equipment and the introduction of new materials, have optimized the crystal pulling process.
Automation plays a crucial role in increasing effective production capacity while reducing the need for manpower. Intelligent automated tools now control single-crystal furnaces, minimizing human intervention and improving the consistency of the crystal growth process, further strengthening LONGi’s position as a technology leader.
