perovskite-silicon tandem solar cell

Researchers in China have integrated a wide-bandgap perovskite solar cell with a hybrid back contact device in a four-terminal tandem cell that achieves high efficiency and stability. Key for the strong performance was a new surface passivation strategy that the research group adopted for the top cell.

An international research team has developed a perovskite-silicon tandem solar cell with a hole transport layer based on methyl-substituted carbazole and submicron-sized textured silicon bottom heterojunction cells. The proposed cell configuration uses commercially available Czochralski silicon wafers and promises efficiencies over 30%.

Researchers in China have fabricated a perovskite-silicon tandem solar cell that utilizes an indium oxide sputtering buffer layer to protect the perovskite absorber and the electron transport layer from potential damages arising from the electrode deposition process. The new layer not only ensured this protection but also showed strong optical and electrical properties.

A Saudi-Chinese research team has fabricated a perovskite-silicon tandem solar cell without a hole transport layer (HTL) in the perovskite top cell. This innovative strategy, based on the co-deposition of copper(I) thiocyanate and perovskite in the top cell absorber, was intended at solving typical issues of HTLs in tandem devices.

The perovskite-silicon tandem device has a two terminal configuration and a 2D perovskite layers at the bottom interface. It was able to retain around 80% of its initial efficiency for 1,700 h.

A research group at the Indian Institute of Technology Roorkee has fabricated 4-terminal silicon-perovskite tandem solar cells with power conversion efficiency of 28%. The team is now scaling up this technology to match 18.2 cm x 18.2 cm, commercial M10 solar cells dimension.

The German research institute said it utilized a hybrid manufacturing route to deposit the perovskite solar on the cell’s top PV device based on an industrially textured silicon heterojunction technology. For the bottom subcell, a standard silicon solar cell was used.

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%.

The 9 cm² cell consists of a top cell based on a perovskite absorber and a bottom cell with a heterojunction (HJT) structure. The results improve on the 28.4% efficiency CEA and Enel achieved for the same kind of cell in December.

Researchers at the University of Sydney have achieved a 30% efficiency rating with a monolithic perovskite-silicon tandem solar cell and now have their sights set on a new target.