The Role of Photon Reabsorption in Masking Intrinsic Bimolecular Charge-Carrier Recombination in CH3NH3PbI3Perovskite.

Crothers, Timothy; Milot, Rebecca L.; Patel, Jay B.; Parrott, Elizabeth S.; Schlipf, Johannes; Müller‐Buschbaum, Peter; Johnston, Michael B.; Herz, Laura

doi:10.29363/nanoge.nfm.2018.201

Cited by 10 publications

(16 citation statements)

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“…The small grains observed in our study are consistent with the previous reports on vacuum-deposited perovskite. 30,35,36 However, the cross-sectional SEM images present two different perovskite morphologies. These morphological differences are expected as it is already known that the underlayer influences the perovskite crystallization.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Mechanistic Insights into the Role of the Bis(trifluoromethanesulfonyl)imide Ion in Coevaporated p–i–n Perovskite Solar Cells

Klipfel

Kanda

Mensi

et al. 2021

ACS Appl. Mater. Interfaces

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Hybrid lead halide perovskites have reached comparable efficiencies to state-of-the-art silicon solar cell technologies. However, a remaining key challenge toward commercialization is the resolution of the perovskite device instability. In this work, we identify for the first time the mobile nature of bis-(trifluoromethanesulfonyl)imide (TFSI − ), a typical anion extensively employed in p-type dopants for 2,2′7,7′-tetrakis(N,N-di-p-methoxyphenylamine)-9,9′spirofluorene (spiro-OMeTAD). We demonstrate that TFSI − can migrate through the perovskite layer via the grain boundaries and accumulate at the perovskite/electrontransporting layer (ETL) interface. Our findings reveal that the migration of TFSI − enhances the device performance and stability, resulting in highly stable p−i−n cells that retain 90% of their initial performance after 1600 h of continuous testing. Our systematic study, which targeted the effect of the nature of the dopant and its concentration, also shows that TFSI − acts as a dynamic defect-healing agent, which self-passivates the perovskite crystal defects during the migration process and thereby decreases nonradiative recombination pathways.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Mechanistic Insights into the Role of the Bis(trifluoromethanesulfonyl)imide Ion in Coevaporated p–i–n Perovskite Solar Cells

Klipfel

Kanda

Mensi

et al. 2021

ACS Appl. Mater. Interfaces

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“…Changes in σ are thus connected to variations in reabsorption. We know that at room temperature, the PL spectrum is blueshifted with respect to 170 K; 24 see Figure 2b. The observed increasing extinction length for rising temperature is thus due to an increasing Stokes shift and reduced reabsorption of emitted PL light.…”

Section: Figure 2amentioning

confidence: 94%

“…The laser fluence was adjusted such that the peak charge carrier density n would not exceed 5 × 10 18 cm −3 to prevent a substantial nonlinear contribution to the charge carrier decay dynamics. 24 The photocreated electrons and holes undergo diffusion and eventually recombine, emitting photoluminescence (PL) light centered at a temperature-dependent wavelength between 768 nm (1.61 eV) and 781 nm (1.59 eV). PL of the film is detected as a function of distance d between excitation and detection, time t, and temperature T. This is achieved by an additional scanning mirror in the detection beam path, an avalanche photodiode, and fast electronics (time-correlated single-photon counting).…”

Section: ■ Experimental Approachmentioning

confidence: 99%

Temperature-Dependent Ambipolar Charge Carrier Mobility in Large-Crystal Hybrid Halide Perovskite Thin Films

Biewald

Giesbrecht

Bein

et al. 2019

ACS Appl. Mater. Interfaces

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Perovskite-based thin-film solar cells today reach power conversion efficiencies of more than 22%. Methylammonium lead iodide (MAPI) is prototypical for this material class of hybrid halide perovskite semiconductors and at the focal point of interest for a growing community in research and engineering. Here, a detailed understanding of the charge carrier transport and its limitations by underlying scattering mechanisms is of great interest to the material’s optimization and development. In this article, we present an all-optical study of the charge carrier diffusion properties in large-crystal MAPI thin films in the tetragonal crystal phase from 170 K to room temperature. We probe the local material properties of individual crystal grains within a MAPI thin film and find a steady decrease of the charge carrier diffusion constant with increasing temperature. From the resulting charge carrier mobility, we find a power law dependence of μ ∝ T m with m = −(1.8 ± 0.1). We further study the temperature-dependent mobility of the orthorhombic crystal phase from 50 to 140 K and observe a distinctly different exponent of m = −(1.2 ± 0.1).

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“…17−19 However, several reports have since shown that, when photon recycling is taken into account, 5,20−23 the radiative bimolecular rate constant matches that which would be expected from reciprocity relations and is perhaps not "slow" as previously thought. 5,15,20,24,25 These results have established an ongoing debate as to whether or not recombination in perovskites is truly unique.…”

Section: Introductionmentioning

confidence: 99%

Charge-Carrier Recombination in Halide Perovskites

et al. 2019

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In 1983 he was in the very small inaugural group promoted by Sandia National Laboratories to be a Distinguished Member of Technical Staff. He retired from Sandia but continues his research while an Adjunct Professor in the Department of Physics and Astronomy of the University of New Mexico. In 2008 David Emin was named an "outstanding referee" by the American Physical Society in its first round of selectees. Thomas Kirchartz received his PhD from the RWTH Aachen in 2009 and subsequently moved to Imperial College London working on organic solar cells with Prof. Jenny Nelson. In 2013, he was appointed Professor at the University of Duisburg-Essen (Electrical Engineering) and became head of a group working on characterization and simulation of solution-processable solar cells at the Research Centre Jülich. Since 2017, he is deputy head of the IEK-5 Photovoltaics, the institute dealing with all photovoltaics-related research at the Research Centre Jülich.

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The Role of Photon Reabsorption in Masking Intrinsic Bimolecular Charge-Carrier Recombination in CH3NH3PbI3Perovskite.

Cited by 10 publications

References 0 publications

Mechanistic Insights into the Role of the Bis(trifluoromethanesulfonyl)imide Ion in Coevaporated p–i–n Perovskite Solar Cells

Mechanistic Insights into the Role of the Bis(trifluoromethanesulfonyl)imide Ion in Coevaporated p–i–n Perovskite Solar Cells

Temperature-Dependent Ambipolar Charge Carrier Mobility in Large-Crystal Hybrid Halide Perovskite Thin Films

Charge-Carrier Recombination in Halide Perovskites

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