2D/3D Hybrid Cs<subscript>2</subscript>AgBiBr<subscript>6</subscript> Double Perovskite Solar Cells: Improved Energy Level Alignment for Higher Contact‐Selectivity and Large Open Circuit Voltage.
In: Advanced Energy Materials, Jg. 12 (2022-02-17), Heft 7, S. 1-12
Online
academicJournal
Zugriff:
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. [ABSTRACT FROM AUTHOR]
Titel: |
2D/3D Hybrid Cs<subscript>2</subscript>AgBiBr<subscript>6</subscript> Double Perovskite Solar Cells: Improved Energy Level Alignment for Higher Contact‐Selectivity and Large Open Circuit Voltage.
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Autor/in / Beteiligte Person: | 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 |
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Zeitschrift: | Advanced Energy Materials, Jg. 12 (2022-02-17), Heft 7, S. 1-12 |
Veröffentlichung: | 2022 |
Medientyp: | academicJournal |
ISSN: | 1614-6832 (print) |
DOI: | 10.1002/aenm.202103215 |
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