Defining the composition and electronic structure of large-scale and single-crystalline like Cs2AgBiBr6 films fabricated by capillary-assisted dip-coating method

Jiang, Xiaofeng; Shao, Yangfan; Chen, Linxun; Feng, Yue; Dai, Junfeng; Zhang, Xusheng; Lin, Yi; Zhu, Yudong; Wu, Zhenggang; Zheng, Yini; Pan, Hui; Liu, Chang; Shi, Xingqiang; Cheng, Xing; He, Zhubing

doi:10.1016/j.mtener.2019.01.010

Cited by 32 publications

(30 citation statements)

References 54 publications

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“…S6). While the WF value of undoped Cs2AgBiBr6 is found at 5.07 eV, in agreement with previous reports on Cs2AgBiBr6 highly crystalline thin films, 10 a 50 meV shift toward smaller values (higher Fermi level) is found for the Eu-doped sample (a small variation is found also for the Yb-doped one, i.e. a small broadening of the overall Gaussian distribution at the lower energy limit).…”

supporting

confidence: 92%

Lanthanide-Induced Photoluminescence in Lead-Free Cs₂AgBiBr₆ Bulk Perovskite: Insights from Optical and Theoretical Investigations

Schmitz

Guo

Horn

et al. 2020

J. Phys. Chem. Lett.

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Emphasis was recently placed on the Cs2AgBiBr6 double perovskite as a possible candidate to substitute toxic lead in metal halide perovskites. However, its poor light-emissive features currently make it unsuitable for solid-state lighting. Lanthanides doping is an established strategy to implement luminescence in poorly emissive materials, with the additional advantage of fine-tuning the emission wavelength. We discuss here the impact of Eu-and Yb-doping on the optical properties of Cs2AgBiBr6 thin films, obtained from solution-processing of hydrothermally synthesized bulk crystalline powders, by combining experiments and density functional theory calculations. Eu(III) incorporation does not lead to the characteristic 5 D0→ 7 F2 emission feature at 2 eV, while only a weak trap-assisted sub band-gap radiative emission is reported. Oppositely, we demonstrate that incorporated Yb(III) leads to an intense and exclusive photoluminescence emission in the nearinfrared as a result of the efficient sensitization of the lanthanide 2 F5/2→ 2 F7/2 transition.

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supporting

confidence: 92%

Lanthanide-Induced Photoluminescence in Lead-Free Cs₂AgBiBr₆ Bulk Perovskite: Insights from Optical and Theoretical Investigations

Schmitz

Guo

Horn

et al. 2020

J. Phys. Chem. Lett.

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“…reported on limiting factors in complete solar cells, revealing that one factor hampering the solar cell efficiency is a small electron diffusion length while the hole‐diffusion length is rather large. [ 37 ] Much effort has been put into the optimization of crystallinity and orientation of thin films of Cs 2 AgBiBr 6 , [ 20,38 ] as well as interface modifications, [ 23,39,40 ] the improvement of the optoelectronic properties of single crystals [ 41,42 ] or regarding the origin of the photoluminescence (PL). [ 43,44 ] Yet, there is still no consensus on how to exactly interpret the absorption and emission features [ 44,45 ] and how to explain the severe differences between reported optical data of nominally the same material.…”

Section: Introductionmentioning

confidence: 99%

The Bottlenecks of Cs₂AgBiBr₆ Solar Cells: How Contacts and Slow Transients Limit the Performance

Sirtl

Ebadi²,

Gorkom

et al. 2021

Advanced Optical Materials

105

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Cs2AgBiBr6 has attracted much interest as a potential lead‐free alternative for perovskite solar cells. Although this material offers encouraging optoelectronic features, severe bottlenecks limit the performance of the resulting solar cells to a power conversion efficiency of below 3%. Here, the performance‐limiting factors of this material are investigated in full solar cells featuring various architectures. It is found that the photovoltaic parameters of Cs2AgBiBr6‐based solar cells strongly depend on the scan speed of the J/V measurements, suggesting a strong impact of ionic conductivity in the material. Moreover, a sign change of the photocurrent for bias voltages above 0.9 V during the measurement of the external quantum efficiency (EQE) is revealed, which can be explained by non‐selective contacts. The radiative loss of the VOC from sensitive subgap‐EQE measurements is calculated and it is revealed that the loss is caused by a low external luminescence yield and therefore a high non‐radiative recombination, supported by the first report of a strongly red shifted electroluminescence signal between 800 and 1000 nm. Altogether, these results point to a poor selectivity of the contacts and charge transport layers, caused by poor energy level alignment that can be overcome by optimizing the architecture of the solar cell.

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“…To achieve a high crystallite orientation, as well as a rather high crystallinity of the thin films, either complicated syntheses have to be used, or the presence of (nondetrimental) secondary phases has to be accepted. [ 26,45 ] Also, additive addition has proven to improve the thin film crystallinity. [ 61–63 ] The highest PCE using an antisolvent was achieved by Gao et al for a planar heterojunction in n–i–p architecture.…”

Section: The Role Of Fabrication Methodsmentioning

confidence: 99%

“…[ 28 ] On the other hand, n‐type behavior has been found by photoelectron spectroscopy measurements on single crystals. [ 45 ] To explain higher internal quantum efficiencies for light absorbed closer to the n‐contact, [ 24,28 ] low electron diffusion length/mobility, or the mentioned high p‐type doping could be an explanation at first glance. However, these explanations are not consistent with a photocurrent (internal quantum efficiency [IQE]) that hardly depends on voltage, the decent fill factors (FFs), and strong luminescence quenching in devices.…”

Section: Doubling the Efficiency From 3% To 6%: Device Optimization—c...mentioning

confidence: 99%

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

Tress

Sirtl

2021

Solar RRL

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Defining the composition and electronic structure of large-scale and single-crystalline like Cs2AgBiBr6 films fabricated by capillary-assisted dip-coating method

Cited by 32 publications

References 54 publications

Lanthanide-Induced Photoluminescence in Lead-Free Cs₂AgBiBr₆ Bulk Perovskite: Insights from Optical and Theoretical Investigations

Lanthanide-Induced Photoluminescence in Lead-Free Cs₂AgBiBr₆ Bulk Perovskite: Insights from Optical and Theoretical Investigations

The Bottlenecks of Cs₂AgBiBr₆ Solar Cells: How Contacts and Slow Transients Limit the Performance

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

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Defining the composition and electronic structure of large-scale and single-crystalline like Cs2AgBiBr6 films fabricated by capillary-assisted dip-coating method

Cited by 32 publications

References 54 publications

Lanthanide-Induced Photoluminescence in Lead-Free Cs2AgBiBr6 Bulk Perovskite: Insights from Optical and Theoretical Investigations

Lanthanide-Induced Photoluminescence in Lead-Free Cs2AgBiBr6 Bulk Perovskite: Insights from Optical and Theoretical Investigations

The Bottlenecks of Cs2AgBiBr6 Solar Cells: How Contacts and Slow Transients Limit the Performance

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

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Product

Resources

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Lanthanide-Induced Photoluminescence in Lead-Free Cs₂AgBiBr₆ Bulk Perovskite: Insights from Optical and Theoretical Investigations

Lanthanide-Induced Photoluminescence in Lead-Free Cs₂AgBiBr₆ Bulk Perovskite: Insights from Optical and Theoretical Investigations

The Bottlenecks of Cs₂AgBiBr₆ Solar Cells: How Contacts and Slow Transients Limit the Performance

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