Friday, June 14, 2024

TU Delft presents 21.14%-efficient IBC-HJT photo voltaic cell primarily based on molybdenum oxide gap collector – pv journal International


Researchers at Delft University of Technology have developed an interdigitated again contact and heterojunction photo voltaic cell that makes use of a skinny full-area molybdenum oxide layer as a blanket layer. The gadget reportedly ensures well-passivated gaps between the electron and gap assortment areas.

Scientists at Delft University of Technology within the Netherlands have designed a photo voltaic cell with an interdigitated again contact (IBC) and heterojunction (HJT) structure that makes use of an electron assortment contact stack primarily based on molybdenum oxide (MoO).x).

MoOx is a transition metallic oxide (TMO) nanomaterial with each novel nanoeffects and glorious semiconductor properties.

“We have proven that the usage of such skinny MoOx reduces the shunting loss because of its low lateral conductivity whereas enabling a simplified manufacturing course of,” the lead writer of the analysis, Katarina Kovačević, stated. pv journal. “In the offered construction, MoOx acts as a gap transport layer, whereas electron assortment takes place by means of a novel layer stack.”

The analysis crew defined that, within the proposed cell design, the holes are collected by a stack shaped by a skinny intrinsic hydrogenated amorphous silicon (a-Si:H) layer, the MoOxand clear conductive oxides (TCO), whereas electrons are collected by a blanket layer fabricated from a-Si:H, nc-Si:H, MoOxand TCO.

“Moox was chosen as a result of it’s characterised by low lateral conductivity in comparison with doped hydrogenated nanocrystalline silicon (nc-Si:H), “stated the researchers. “In the proposed structure, a skinny MoOx The layer is deposited as a blanket layer over your complete bottom of the gadget on a pre-patterned nc-Si:H layer.

The scientists constructed the cell with an indium tin oxide (ITO) substrate, the blanket layer fabricated from a-Si:H, nc-Si:H, MoOxan absorber fabricated from n-type monocrystalline silicon, passivating contacts primarily based on polysilicon and silicon monoxide (SiOx), and a silver (Ag) metallic contact.

Schematic illustration of (A) IBC-SHJ photo voltaic cell with full-area MoOx on the again aspect, (B) symmetrical contact resistivity pattern, and (C) FBC-SHJ photo voltaic cell with MoOx as half within the electron assortment contact stack in entrance. border

Image: TU Delft, Advances in Photovoltaics, Creative Commons License CC BY 4.0

“Besides the novel contact stack, our structure is a superb platform for testing industrially related processes,” Kovačević additional defined. “First, Ag-free and ITO-free contacts are simply applied. Second, since TMOs may be deposited quicker than p-type silicon skinny movies, the trade can profit from larger throughput. Third, our high-efficiency IBC photo voltaic cells will probably be efficient elements for future three-terminal perovskite-silicon tandem units.

The analysis crew examined the efficiency of the 4.05 cm2 photo voltaic cell constructed with this configuration underneath normal illumination situations and the gadget was discovered to realize an influence conversion effectivity of 21.14%, an open-circuit voltage of 689 mV, a short-circuit present density. of 39.02 mA/cm2, and a fill issue of 78.61%.

The lecturers attribute the nice efficiency of the champion gadget to the optimization of the fabrication flowchart and exact photolithographic patterning, which they are saying ensures good alignment and good gaps between the electron assortment areas. and gap.

“Guided by optoelectrical simulation, additional optimization of the manufacturing course of, improved plasma remedies, MoOx and (n)nc-Si:H layer, and introduction of improved ARC(s) is predicted to speed up efficiencies of greater than 24% within the quick time period with the proposed structure,” they added.

The novel cell structure is launched within the paper “Interdigitated-back-contacted silicon heterojunction photo voltaic cells with novel MoO.x-based contact stacks,” revealed in Advances in Photovoltaics.

The identical analysis group established in 2022 an HJT cell primarily based on a MoOx gap collector. The gadget achieved an influence conversion effectivity of 23.83% and a fill issue of 82.18%. “The licensed effectivity is – to the very best of our information – the very best up to now for any such gadget,” Isabella stated on the time. “The earlier document was beforehand verified by Federal Polytechnic School of Lausanne (EPFL) at 23.5%.

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