Cs<sub>2</sub>AgBiBr<sub>6</sub> Double Perovskites as Lead‐Free Alternatives for Perovskite Solar Cells?

Tress, Wolfgang; Sirtl, Maximilian T.

doi:10.1002/solr.202100770

Cited by 51 publications

(33 citation statements)

References 96 publications

(197 reference statements)

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“…Perovskite materials were used in solar cells for the first time in 2009 with a power conversion efficiency (PCE) of only 3.8%, 12 which has since exceeded 25% over ten years of development, [13][14][15][16] higher than that of commercial silicon solar cells, as shown in Fig. 1(b).…”

Section: Chunqian Zhangmentioning

confidence: 99%

Research progress of ABX₃-type lead-free perovskites for optoelectronic applications: materials and devices

Wang

Zhang

Huang

et al. 2022

Phys. Chem. Chem. Phys.

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Section: Chunqian Zhangmentioning

confidence: 99%

Research progress of ABX₃-type lead-free perovskites for optoelectronic applications: materials and devices

Wang

Zhang

Huang

et al. 2022

Phys. Chem. Chem. Phys.

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“…While the value of the 3D reference is comparable to that from ref. [17], the 0.01 m cell indicates a significant improvement of the recombination behavior and thus explains a reduction of non-radiative V OC losses (difference between radiative V OC limit (V OC,rad ) and the V OC ) by up to 50 mV according to Equation (2): [17,27,28,58]…”

Section: Photoluminescence and Light Intensity Dependent V Ocmentioning

confidence: 99%

“…[17] Moreover, a short electron diffusion length in deposited thin film structures, [21] ultra-fast self-trapping of free charge carriers [22] and large non-radiative V OC losses have been found, [17] while it remains unclear whether a large exciton binding energy is hampering the solar cell efficiency [23,24] and how the PL signal of the thin films can be explained. [13,17,25] Another challenge is the rather large and indirect bandgap of 1.9-2.3 eV, [13,[26][27][28] especially since the stabilization of the related double perovskite Cs 2 AgBiI 6 has not yet been realized due to the low thermodynamic stability of this compound. [29] While tuning of the absorption onset is pursued by using additives and alloying, [30][31][32][33][34] as well as high pressure modification, [35] a promising pathway to stabilize iodine based Ag-Bi double perovskites is the introduction of a large A-site cation in order to form 2D double perovskites, as first introduced by Connor et al in 2018 using bromide.…”

Section: Introductionmentioning

confidence: 99%

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

Wolf

Bein

Armer

et al. 2022

Proceedings of the International Conference on Hybrid and Organic Photovoltaics

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to solve several issues arising from their lead-based cousins featuring excellent optoelectronic properties. [1] Changing the simple perovskite ABX 3 structure to a 2 × 2 × 2 supercell, halide double perovskites have the general formula A 2 B I B III X 6 where two bivalent cations B 2+ are exchanged by a combination of one monovalent cation B + (e.g., Cu + , Ag + , Au + , In + ) and one trivalent cation B 3+ (e.g., Bi 3+ , Sb 3+ ). [2] Several theoretical calculations have been performed on this structural motif, providing a large variety of proposed thermodynamically stable compounds of which Cs 2 AgBiBr 6 proved to be the most promising material so far. [3][4][5][6][7] Cs 2 AgBiBr 6 was characterized first by McClure et al. [8] and, being long-term stable at ambient conditions and providing alternative element combinations that exclude toxic elements, [2] this material was moved into the focus of research, especially due to promising optoelectronic properties of single crystals (for instance a charge carrier lifetime of >500 ns) [9,10] and the possibility to solution-process the material for thin films synthesis. [11] After the first report on solar cells using Cs 2 AgBiBr 6 as an active layer in 2017, [11] several groups reported solar cells Since their introduction in 2017, the efficiency of lead-free halide perovskite solar cells based on Cs 2 AgBiBr 6 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 V OC 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 TiO 2 . The effect is mainly due to a V OC improvement by up to 70 mV on average, yielding a maximum V OC of 1.18 V using different concentrations of phenethylammonium bromide. While these are among the highest reported V OC values for Cs 2 AgBiBr 6 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.

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“…[1,2] As a Pb-free alternative Cs 2 AgBiBr 6 is thoroughly investigated being a promising candidate for PV application. [3][4][5][6][7] The power conversion efficiency (PCE) of Cs 2 AgBiBr 6 was reported to be as high as 3.11%. [8] Previous reports of lower PCE in Cs 2 AgBiBr 6 -based perovskite solar cell mostly resulted from the induced defects, which act as trap states leading to a low external quantum efficiency (EQE) and photoluminescence quantum yield (PLQY).…”

Section: Introductionmentioning

confidence: 99%

Controlling the Defects of Cs₂AgBiBr₆ by Varied Precursor Compositions

Frebel

Yoon

Neguse

et al. 2022

Advanced Photonics Research

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Cs₂AgBiBr₆ Double Perovskites as Lead‐Free Alternatives for Perovskite Solar Cells?

Abstract: The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/solr.202100770.

Cited by 51 publications

References 96 publications

Research progress of ABX₃-type lead-free perovskites for optoelectronic applications: materials and devices

Research progress of ABX₃-type lead-free perovskites for optoelectronic applications: materials and devices

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

Controlling the Defects of Cs₂AgBiBr₆ by Varied Precursor Compositions

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Cs2AgBiBr6 Double Perovskites as Lead‐Free Alternatives for Perovskite Solar Cells?

Abstract: The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/solr.202100770.

Cited by 51 publications

References 96 publications

Research progress of ABX3-type lead-free perovskites for optoelectronic applications: materials and devices

Research progress of ABX3-type lead-free perovskites for optoelectronic applications: materials and devices

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

Controlling the Defects of Cs2AgBiBr6 by Varied Precursor Compositions

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Cs₂AgBiBr₆ Double Perovskites as Lead‐Free Alternatives for Perovskite Solar Cells?

Research progress of ABX₃-type lead-free perovskites for optoelectronic applications: materials and devices

Research progress of ABX₃-type lead-free perovskites for optoelectronic applications: materials and devices

Controlling the Defects of Cs₂AgBiBr₆ by Varied Precursor Compositions