Publication

Role of Residual PbI2in Two-step Vapor Processed Perovskite Solar Cells with Methylamine Treatment

2025

Abstract

Methylamine (MA) treatment of vapor-processed perovskite films is used to improve performance of perovskite solar cells (PSC) by a significant increase in open-circuit voltage. In sequential processing of PSCs, the presence of residual PbI2 in the film impacts device performance. This study aims to understand the role of residual PbI2 after MA treatment and its effect on PSCs. We characterize properties of MA-treated PbI2 films and MA-treated perovskite films with different amounts of PbI2 from two-step vapor processing. Our findings suggest that MA interacts with PbI2 and changes its optical properties. However, the role of excess PbI2 in MA-treated and as-deposited PSCs does not change, with Voc improvement after MA treatment depending on the amount of PbI2 in the as-deposited film. An optimized MA-treatment gives approximately a 10% increase in VOC compared to untreated PSC devices.

Official source

https://infoscience.epfl.ch/entities/publication/024c8b69-e00f-453a-add7-4425f2b328c8

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2025

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/024c8b69-e00f-453a-add7-4425f2b328c8

About this result

Related concepts (32)

Perovskite solar cell

A perovskite solar cell (PSC) is a type of solar cell that includes a perovskite-structured compound, most commonly a hybrid organic–inorganic lead or tin halide-based material as the light-harvesting active layer. Perovskite materials, such as methylammonium lead halides and all-inorganic cesium lead halide, are cheap to produce and simple to manufacture. Solar-cell efficiencies of laboratory-scale devices using these materials have increased from 3.8% in 2009 to 25.

Thin-film solar cell

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).

Dye-sensitized solar cell

A dye-sensitized solar cell (DSSC, DSC, DYSC or Grätzel cell) is a low-cost solar cell belonging to the group of thin film solar cells. It is based on a semiconductor formed between a photo-sensitized anode and an electrolyte, a photoelectrochemical system. The modern version of a dye solar cell, also known as the Grätzel cell, was originally co-invented in 1988 by Brian O'Regan and Michael Grätzel at UC Berkeley and this work was later developed by the aforementioned scientists at the École Polytechnique Fédérale de Lausanne (EPFL) until the publication of the first high efficiency DSSC in 1991.

Related publications (32)

Role of Residual PbI2in Two-step Vapor Processed Perovskite Solar Cells with Methylamine Treatment

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