Nanostructures assist in some ways

Tandem photo voltaic cells manufactured from perovskite and silicon allow considerably larger efficiencies than silicon photo voltaic cells alone. Tandem cells from HZB have already achieved a number of world data. Most not too long ago, in November 2021, HZB analysis groups achieved an authorized effectivity of 29.8 % with a tandem cell manufactured from perovskite and silicon. This was an absolute world report that stood unbeaten on the prime for eight months. It was not till the summer season of 2022 {that a} Swiss staff at EPFL succeeded in surpassing this worth.

Three HZB groups labored intently collectively for the record-breaking tandem cell. Now they current the small print in Nature Nanotechnology. The journal additionally invited them to jot down a analysis briefing, by which they summarize their work and provides an outlook on future developments.

Textures improves the efficiency

“Our competences complement one another very nicely,” says Prof. Dr. Christiane Becker, who developed the world report cell with the staff led by Dr. Bernd Stannowski (silicon backside cell) and Prof. Dr. Steve Albrecht (perovskite prime cell). Becker’s staff launched a nano-optical construction into the tandem cell: a gently corrugated nanotexture on the silicon floor.

“Most shocking, this texture brings a number of benefits without delay: it reduces reflection losses and ensures a extra common perovskite movie formation,” says Becker. As well as, a dielectric buffer layer on the again of the silicon reduces parasitic absorption at near-infrared wavelengths.

The researchers conclude that personalized nanotextures may help to enhance perovskite semiconductor supplies on various ranges. These outcomes should not solely priceless for tandem photo voltaic cells manufactured from perovskite and silicon, but in addition for perovskite-based light-emitting diodes.