Breakthrough: 31.5% Efficient 4T Perovskite/Silicon Tandem Solar Cell

• Revolutionary solar cell design by KAUST researchers achieves record-breaking 31.5% efficiency with innovative hole transport layer technology.

Researchers from King Abdullah University of Science and Technology (KAUST) have developed a four-terminal perovskite/perovskite/silicon triple-junction tandem solar cell with a record-breaking efficiency of 31.5%. The device structure includes a perovskite single-junction top cell and a monolithic perovskite/silicon tandem bottom cell. The key feature of the cell is the hole transport layer of the top perovskite cell, which was engineered with self-assembled monolayers.

The top perovskite solar cell was built with various layers including a substrate made of glass and indium tin oxide, an absorber based on Cs0.1FA0.9PbI1Br1.96Cl0.04 perovskite material, and an electron transport layer based on C60 and tin(IV) oxide. The mid perovskite device and the bottom silicon cell were integrated into a monolithic perovskite/silicon tandem cell with an efficiency of 17.2%. The team found that all devices retained 80% of their initial efficiency after 1,500 minutes of maximum power point tracking.

What is the efficiency of the four-terminal perovskite/perovskite/silicon triple-junction tandem solar cell?

• The efficiency of the four-terminal perovskite/perovskite/silicon triple-junction tandem solar cell is 31.5%.
  
• The device structure includes a perovskite single-junction top cell and a monolithic perovskite/silicon tandem bottom cell.
  
• The key feature of the cell is the hole transport layer of the top perovskite cell, which was engineered with self-assembled monolayers.
  
• The top perovskite solar cell was built with various layers including a substrate made of glass and indium tin oxide, an absorber based on Cs0.1FA0.9PbI1Br1.96Cl0.04 perovskite material, and an electron transport layer based on C60 and tin(IV) oxide.
  
• The mid perovskite device and the bottom silicon cell were integrated into a monolithic perovskite/silicon tandem cell with an efficiency of 17.2%.
• All devices retained 80% of their initial efficiency after 1,500 minutes of maximum power point tracking.