Published in a new scientific article in natureThe Chinese manufacturer presented a new Tandem Perovskiet-Silicon solar cell based on a soil cell with a hetero junction design. It also used a new type of self-assembled monolaag that reportedly reduces non-rays recombination and increases cell efficiency.
This week, the Chinese solar module maker Longi has presented a new Tandem Perovskiet-Silicon Zonnecel based on an asymmetrical self-assembled monolaag (SAM) aimed at reducing passivating defects and increasing efficiency.
SAMs are currently used as a state-of-the-art hole transport layers based on perovskite-based solar cells and offer low parasitic absorption, fast load extraction and effective passivation of the buried interface of the perovskite. However, controlling their thickness, packaging density and orientation remains very challenging.
The new tandem device was developed in collaboration with Chinese Soochow University and was described in the newspaper “Efficient Perovskiet/silicon tandem with asymmetrical self -assembly molecule“Which was recently published in nature.
“Andere van de meest gerapporteerde SAM’s op carbazol, die een symmetrische moleculaire structuur hebben met stikstofatomen die zijn gebonden aan fosfonzuur-verankeringsgroepen, hebben we een asymmetrische carbazol-gebaseerde SAM geconstrueerd die spacers bevat en fosfonzuurgroepen die de fenylring van de carbazol-kern van de lange selevers hebben opgenomen, een ghost solar cells of long-term PV -Magazine.
Dubbeds HTL201, the new SAM reportedly improves coverage and uniformity on structured silicon substrates, while optimizing the interfacial energy level. “At the same time, the strong coordination interaction between HTL201 and the Perovskite film effectively reduces non-rays recombination on the buried interface,” the spokesperson added.
The SAM is designed with a vertical configuration that offers supposedly optimal interaction with the transparent guide oxide (TCO) recombination layer, which in turn improves coverage on the TCO substrate. Moreover, the coordination of the energy level between HTL201 and the Perovskiet abbsorber appeared to improve the gate extraction and at the same time reduce interfacial non-rugged recombination.
The research team built the upper perovskiet cell with a silver (AG) metal contact, a thin lithium fluoride (Lif) layer and short chain ethylendiammonium diiodide (Edai) molecules. Furthermore, it used one Electron Transport Layer (ETL) Made from thermally evaporated Buckminsterfullerene (C60), a tinoxide (SNO2) layer, layer, A transparent back contact made from indium zinc oxide (IZO), A perovskite absorber and the proposed Sam.
As for the lower device, Longi said it was a heterojunction-silicon cell with double side, without providing further details or to indicate whether it used the 27.3%efficient heterojunction back contact (BC) Solar cell that was recently presented in another scientific article published in another scientific article published published in another scientific article published published in another scientific article published. nature – “Silicon hetero junction back contact solar cells by laser patterns. “
Tested under standard lighting conditions, a tandem solar cell built with this configuration and a surface area of 1 cm2 achieved a power conversion efficiency of 34.58%, an open circuit voltage of 2.001 V, a short-circuit power density of 20.64 mA/cm2 and a filling factor of 83.79%.
“The effective defect-passion on the buried interface improves the quasi-fermi level split of the perovskiet layer, which led to an impressive open circuit voltage of 2 V,” the spokesperson explained. “Our research offers critical technical solutions for the development of new SAM materials and the further setting up of silicon-perovskiet tandem efficiency.”
Longi currently has the world record for the power conversion efficiency of Tandem Perovskiet Silicon solar cells with a device of 34.85%. The previous record was held by Longi itself, which achieved efficiency of 34.6% for a device with the same configuration in September, when the manufacturer published a scientific published paper Describe the cell design in detail, which was originally unveiled in November 2023.
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