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Imec presents inverted perovskite solar cell with 24.3% efficiency – pv magazine International


Researchers on the Belgian analysis institute used a dual-layer therapy for the perovskite absorber, which they are saying improves cell effectivity and stability. The system achieves an open-circuit voltage of 1.17 V, a brief circuit density of 24.5 mA/cm2, and a fill issue of 84.6%.

Belgian analysis institute Imec has developed an inverted perovskite photo voltaic cell with decreased nonradiative recombination and improved interfacial contact.

The cell has a pin construction, which implies that the perovskite cell materials is deposited into the outlet transport layer, after which lined with the electron transport layer – the other strategy to the standard nip system structure. Inverted perovskite photo voltaic cells usually present good stability, however lag behind standard units by way of conversion and cell efficiency.

The system additionally makes use of an “higher” interface between the perovskite and the buckminsterfullerene (C60) electron transport layer and a “decrease” interface between the perovskite and the outlet transport layer made from nickel(II) oxide (NiOx). Each interfaces are handled with an ammonium salt referred to as 2-thiopheneethylammonium chloride (TEACl). The outcomes are in contrast.

The scientists stated that the dual-layer therapy resulted in improved effectivity, with a relative energy conversion effectivity (PCE) improve of 9% in comparison with a reference untreated system.

“Optimizing these interfaces can scale back losses and enhance vitality extraction, leading to elevated system effectivity and operational stability,” say the researchers, who say that this structure creates a 2D perovskite layer on the interface. Cells with this configuration usually exhibit massive exciton binding energies and this are sometimes extra steady than standard 3D units as a result of safety offered by natural ligands.

Described in full within the paper “Minimizing Interface-Pushed Losses in Inverted Perovskite Photo voltaic Cells and Modules,” printed in ACS Power Lettersthe cell achieved an influence conversion effectivity of 24.3%, an open-circuit voltage of 1.17 V, a short-circuit density of 24.5 mA/cm2, and a fill issue of 84.6%.

“Along with the development in effectivity, we additionally see a outstanding stability,” stated Tom Aernouts, R&D supervisor of the Skinny-Movie Photovoltaics group. “In actual fact, after 1,000 hours of steady operation underneath a single day of illumination, the units present a 97% efficiency retention, which is without doubt one of the finest immediately.”

The group additionally discovered that the cell retained 88% of its preliminary efficiency after 1,850 hours, in comparison with 55% of untreated cells.

Lecturers additionally used the cells to create a mini module of three.63 cm2 that achieved an effectivity of twenty-two.6% and a filling issue of 82.4%. “Nevertheless, the commercialization of such functions requires industrially suitable processing strategies, which overcome the present problems with stability, and so forth.,” they specified.

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