Longi has achieved an efficiency of 27.81% for its n-type silicon heterojunction interdigitated back contact (HIBC) solar cell. This result was independently certified by the Institute for Solar Energy Research in Hameln (ISFH), Germany, under standard test conditions.
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The HIBC solar cell combines heterojunction technology with a back contact architecture, eliminating front-side metallisation and maximising light absorption. Built on industry-grade gallium-doped silicon wafers, the device features excellent passivation quality, high open-circuit voltage and optimised charge carrier capture. This performance marks the highest efficiency ever measured for a commercial-scale monofacial silicon solar cell.
34.85% efficiency for perovskite tandem cells
Longi also set a new record of 34.85% conversion efficiency for its crystalline silicon and perovskite tandem solar cell, certified by the US National Renewable Energy Laboratory (NREL).
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The cell has a two-terminal structure in which a perovskite top cell is combined with a crystalline silicon bottom cell. The tandem architecture was developed at LONGi's research and development centre in Xi'an and utilises complementary band gaps to maximise the utilisation of the solar spectrum. The result approaches the theoretical efficiency limit of 43%. (hcn)
