Crystalline-silicon heterojunction back contact solar cells with 27.09% efficiency

https://www.nature.com/articles/s41467-024-53275-5

"better manages charge carrier recombination/ transport... laser patterning... recombination losses primarily arise from hole-selective contact region/ polarity boundaries... relationship between contact resistivity, series resistance, and rear-side pattern design... wafer edge becomes main channel for current density loss once electrical shading around electron-selective contact region mitigated... advanced nanocrystalline passivating contact, wafer edge passivation, front anti-reflection coating/ rear reflector optimization"