Four-terminal tandem perovskite/CIGS solar cell with 25.5% efficiency

Researchers in China have developed a four-junction tandem perovskite/CIGS cell. They claim it is the most efficient device of its kind with an n-i-p structure thus far. They used a novel surface passivation strategy to improve the perovskite cell efficiency and fill factor.Researchers from the Wuhan University in China have fabricated a four-junction tandem (4T) solar cell based on perovskite and copper, indium, gallium and selenium (CIGS), through a novel surface passivation technique that uses guanidine bromide (GABr). They tested GABr in mixed solvents combining isopropyl alcohol (IPA) and ...

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