Publication

Firing-Through Metallisation of PERT-Like Cells Using μc-Si(n) as Thin Rear Side Full Area Passivating Contact

Christophe Ballif, Franz-Josef Haug, Quentin Thomas Jeangros, Andrea Ingenito, Sylvain Nicolay
2020
Conference paper

Abstract

37th European Photovoltaic Solar Energy Conference and Exhibition; 206-207 We present a firing-through metallisation approach for n-type passivating rear contacts that consist of a tunnelling oxide and an n-doped bilayer of a-SiOx and μc-Si. We find implied Voc up to 738 mV and contact resistivities as low as 20 mΩcm2. Implemented into 6-inch solar cells with a B-diffused emitter on the front, the best cell showed a Voc of 687 mV, FF 79.4 % and an overall efficiency of 22.2 %, proving the compatibility with metallisation by a conventional firing-through process. In view of the higher iVoc of the passivating μc-Si(n) contact, higher cell efficiencies are expected through improvements of the front side.

Official source

https://infoscience.epfl.ch/record/285619?ln=en

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Energy engineering

Solar power: Topics in solar power

Related concepts (20)

Solar-cell efficiency refers to the portion of energy in the form of sunlight that can be converted via photovoltaics into electricity by the solar cell. The efficiency of the solar cells used in a photovoltaic system, in combination with latitude and climate, determines the annual energy output of the system. For example, a solar panel with 20% efficiency and an area of 1 m2 will produce 200 kWh/yr at Standard Test Conditions if exposed to the Standard Test Condition solar irradiance value of 1000 W/m2 for 2.

Crystalline silicon or (c-Si) Is the crystalline forms of silicon, either polycrystalline silicon (poly-Si, consisting of small crystals), or monocrystalline silicon (mono-Si, a continuous crystal). Crystalline silicon is the dominant semiconducting material used in photovoltaic technology for the production of solar cells. These cells are assembled into solar panels as part of a photovoltaic system to generate solar power from sunlight. In electronics, crystalline silicon is typically the monocrystalline form of silicon, and is used for producing microchips.

Thin-film solar cells are made by depositing one or more thin layers (thin films or TFs) of photovoltaic material onto a substrate, such as glass, plastic or metal. Thin-film solar cells are typically a few nanometers (nm) to a few microns (μm) thick–much thinner than the wafers used in conventional crystalline silicon (c-Si) based solar cells, which can be up to 200 μm thick. Thin-film solar cells are commercially used in several technologies, including cadmium telluride (CdTe), copper indium gallium diselenide (CIGS), and amorphous thin-film silicon (a-Si, TF-Si).

Related publications (32)

Related MOOCs (1)

La transition énergique suisse / Energiewende in der Schweiz

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Firing-Through Metallisation of PERT-Like Cells Using μc-Si(n) as Thin Rear Side Full Area Passivating Contact

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