In a paper revealed in Nature, the Chinese module producer explains that the 33.9%-efficient tandem machine unveiled in December 2023 is predicated on a bilayer intertwined passivation technique that mixes the environment friendly extraction of electron to additional suppress nonradiative recombination. It additionally revealed that the two-terminal tandem prototype gadgets achieved an effectivity of 34.6%.
Chinese photo voltaic module producer Longi has revealed that it has achieved an influence conversion effectivity of 34.6% in two-terminal tandem perovskite photo voltaic cell prototype gadgets.
“Today, the 2 terminal tandem prototype gadgets made by longi’s tandem staff have been authoritatively verified with a document effectivity of 34.6%,” mentioned the producer, with out offering additional technical particulars. “Commercial-sized two-terminal tandem cells made for mass manufacturing (M6) and the primary sq. meter four-terminal tandem modules on this planet are authoritatively licensed with efficiencies of 30.1% and 25.8%, respectively. These outcomes present a big effectivity benefit of single junction silicon cell know-how.
The announcement was made in the course of the launch of a scientific paper describing the small print of the perovskite-silicon tandem photo voltaic cell which was unveiled in December 2023. This PV machine achieved what stays to today the very best energy conversion effectivity ever recorded. the sort of cell.
At that point, the National Renewable Energy Laboratory (NREL) of the US Department of Energy confirmed the outcomes, which symbolize a world document for this cell typology. The earlier document was held by King Abdullah University of Science and Technology (KAUST) in Saudi Arabia, which achieved 33.7% effectivity for a tool with the identical configuration in June.
Longi’s consequence can also be the primary reported licensed effectivity exceeding the single-junction Shockley-Queisser restrict of 33.7% for a double-junction tandem photo voltaic cell.
The producer’s analysis staff defined that the cell is predicated on a bilayer interface passivation technique that reportedly enhances electron transport and gap blocking. This is achieved by together with a skinny lithium fluoride (LiF) layer and the position of short-chain ethylenediammonium diiodide (EDAI) molecules.
“Thicker LiF layers might help enhance passivity, however there are numerous undesirable resistive losses,” they mentioned. “However, the EDAI molecule will be chemically passivated in unpassivated areas that aren’t in touch with the LiF layer, forming nanoscale localized contacts on the perovskite/C60 interface, which might present an optimum tradeoff between passivation and cost extraction.”
The researchers say they have been in a position to obtain “higher” structural coupling between the perovskite high cell and the crystalline silicon backside cell via a patented know-how for silicon heterojunction photo voltaic cells with an uneven textured floor. “The entrance floor of this silicon cell has a well-textured floor, which facilitates the solution-based preparation of the perovskite movie, whereas the again floor of the silicon cell makes use of a typical large-size on textured floor to attain higher passivation and infrared spectral response,” they added.
Thanks to the LiF / EDAI bilayer chargeable for rising the open-circuit voltage and fill issue of the machine, reaching values of 1.97 V and 83.0%, respectively, as a result of it prevents interfacial recombination along with extra environment friendly extraction within the cost of the electron transport layer ( ETL) interface.
Longi mentioned its analysis work has obtained sturdy assist from Suzhou University, Huaneng Clean Energy Research Institute, and Hong Kong Polytechnic University (HKPU). This is offered within the examine “Perovskite-silicon tandem photo voltaic cells with bilayer interface passivation,” revealed in NATURE.
This content material is protected by copyright and might not be reused. If you wish to cooperate with us and wish to reuse a few of our content material, please contact: [email protected].
Popular content material
