New research locates means to boost light absorption in perovskite/Si tandem solar cells

• A research group, affiliated with UNIST has prospered in achieving a power conversion efficiency (PEC) of 23.50% in a perovskite-silicon tandem solar cell built with a special textured anti-reflective coating (ARC) polymeric film. According to the research study group, the PCE of the tool with the ARC film was sustained for 120 hrs, keeping 91% of its initial value.

This development has actually been led by Professor Kyoung Jin Choi and also his research team in the Department of Materials Science as well as Engineering at UNIST, in cooperation with Professor Jung-Kun Lee as well as his research team from the University of Pittsburgh in the United States.

In the work, the research group methodically showed that a combination of silicon dioxide (SiO2) nanoparticles as well as large phosphor particles can transform ultraviolet (UV) to noticeable light and increase complete transmittance of ARC film. Their experimental as well as computational results additionally show that SiO2 nanoparticles in the ARC film lower the reflectance by increasing the scattered transmittance.

In addition, the PCE of the device with the ARC film was maintained for 120 hrs, maintaining 91% of its first value, while the PCE of existing devices went down to 90% of its initial efficiency after 5 hours, and afterwards reduced to 50% after 20 hours. On top of that, the first efficiency of the solar cell has actually additionally raised by virtually 4.5% compared to the previous one.

"This optically engineered ARC film effectively advertises the light absorption of the perovskite/silicon tandem solar cell, causing the renovation of power conversion effectiveness of the tandem cell from 22.48% to 23.50%," noted the research study team.

The searchings for are released in Advanced Functional Materials.