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2D/3D Hybrid Cs2AgBiBr6 Double Perovskite Solar Cells: Improved Energy Level Alignment for Higher Contact‐Selectivity and Large Open Circuit Voltage

Sirtl, Maximilian T. ; Hooijer, Rik ; Armer, Melina ; Ebadi, Firouzeh G. ; Mohammadi, Mahdi ; Maheu, Clément ; Weis, Andreas ; van Gorkom, Bas T. ; Häringer, Sebastian ; Janssen, René A. J. ; Mayer, Thomas ; Dyakonov, Vladimir ; Tress, Wolfgang ; Bein, Thomas

Advanced energy materials, 2022-02, Vol.12 (7), p.n/a [Periódico revisado por pares]

Weinheim: Wiley Subscription Services, Inc

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Título:
2D/3D Hybrid Cs2AgBiBr6 Double Perovskite Solar Cells: Improved Energy Level Alignment for Higher Contact‐Selectivity and Large Open Circuit Voltage
Autor: Sirtl, Maximilian T. ; Hooijer, Rik ; Armer, Melina ; Ebadi, Firouzeh G. ; Mohammadi, Mahdi ; Maheu, Clément ; Weis, Andreas ; van Gorkom, Bas T. ; Häringer, Sebastian ; Janssen, René A. J. ; Mayer, Thomas ; Dyakonov, Vladimir ; Tress, Wolfgang ; Bein, Thomas
Assuntos: 2D perovskites ; 2D/3D hybrid perovskites ; Alignment ; Cs 2AgBiBr 6 ; Diffusion length ; double perovskites ; Efficiency ; Electron diffusion ; Energy levels ; Open circuit voltage ; Perovskites ; Photoelectrons ; Photovoltaic cells ; Quantum efficiency ; Selectivity ; Solar cells ; Titanium dioxide
É parte de: Advanced energy materials, 2022-02, Vol.12 (7), p.n/a
Descrição: Since their introduction in 2017, the efficiency of lead‐free halide perovskite solar cells based on Cs2AgBiBr6 has not exceeded 3%. The limiting bottlenecks are attributed to a low electron diffusion length, self‐trapping events and poor selectivity of the contacts, leading to large non‐radiative VOC losses. Here, 2D/3D hybrid double perovskites are introduced for the first time, using phenethyl ammonium as the constituting cation. The resulting solar cells show an increased efficiency of up to 2.5% for the champion cells and 2.03% on average, marking an improvement by 10% compared to the 3D reference on mesoporous TiO2. The effect is mainly due to a VOC improvement by up to 70 mV on average, yielding a maximum VOC of 1.18 V using different concentrations of phenethylammonium bromide. While these are among the highest reported VOC values for Cs2AgBiBr6 solar cells, the effect is attributed to a change in recombination behavior within the full device and a better selectivity at the interface toward the hole transporting material (HTM). This explanation is supported by voltage‐dependent external quantum efficiency, as well as photoelectron spectroscopy, revealing a better energy level alignment and thus a better hole‐extraction and improved electron blocking at the HTM interface. Solar cells comprised of a lead‐free Cs2AgBiBr6‐based 2D/3D hybrid double perovskite with PEA+ as constituting cation show an increase of the power conversion efficiency by almost 10% due to a large increase in the VOC. This is attributed to a better contact selectivity caused by an improved energy level alignment at the interface between the perovskite layer and the hole‐transporting material.
Editor: Weinheim: Wiley Subscription Services, Inc
Idioma: Inglês

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2D/3D Hybrid Cs2AgBiBr6 Double Perovskite Solar Cells: Improved Energy Level Alignment for Higher Contact‐Selectivity and Large Open Circuit Voltage

Sirtl, Maximilian T. ; Hooijer, Rik ; Armer, Melina ; Ebadi, Firouzeh G. ; Mohammadi, Mahdi ; Maheu, Clément ; Weis, Andreas ; van Gorkom, Bas T. ; Häringer, Sebastian ; Janssen, René A. J. ; Mayer, Thomas ; Dyakonov, Vladimir ; Tress, Wolfgang ; Bein, Thomas

Weinheim: Wiley Subscription Services, Inc

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