In a paper published in nature, the Chinese module maker explained that the 33.9%-efficient tandem device it unveiled in December 2023 is based on a bilayer intertwined passivation strategy that combines efficient electron extraction with further suppression of nonradiative recombination. It also revealed that its two-terminal tandem prototype devices achieved an efficiency of 34.6%.
I’ve seen them say their solar panels will provide more energy for the same amount of land at a lower cost.
But it doesn’t seem like their prices are publicly available yet.