Excitonic emissions and above-band-gap luminescence in the single-crystal perovskite semiconductors<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>CsPbB</mml:mi><mml:msub><mml:mi mathvariant="normal">r</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>CsPbC</mml:mi><mml:msub><mml:mi mathvariant="normal">l</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>

Sebastian, Maria; Peters, John A.; Stoumpos, Constantinos C.; Im, Jino; Kostina, Svetlana S.; Liu, Zhifu; Kanatzidis, M. G.; Freeman, Arthur J; Wessels, B. W.

doi:10.1103/physrevb.92.235210

Cited by 281 publications

(141 citation statements)

References 73 publications

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“…A clear defined absorption onset estimates a bandgap of 2.23 eV . The steady‐state photoluminescence in Figure S5b (Supporting Information) shows an emission at 2.32 eV which corresponds well to previously observed bound exciton emission . Generally and in contrast to nanocrystalline CsPbBr 3 , the photoluminescence quantum efficiency of crystalline CsPbBr 3 is low due the slight indirect bandgap character of the orthorhombic RT phase …”

Section: Resultssupporting

confidence: 84%

Sensitive Direct Converting X‐Ray Detectors Utilizing Crystalline CsPbBr₃ Perovskite Films Fabricated via Scalable Melt Processing

Matt

Levchuk

Knüttel

et al. 2020

Adv Materials Inter

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Here the fabrication of an inorganic metal‐halide perovskite CsPbBr3 based X‐ray detector is reported utilizing a simple, scalable, and cost‐sensitive melt processing directly on substrate of any size. X‐ray diffraction analysis on the several 100 mm thick melt processed films confirms crystalline domains in the cm2 range. The CsPbBr3 film features a resistance of 8.5 GΩ cm and a hole mobility of 18 cm2 V−1 s−1. An X‐ray to current conversion rate of 1450 mC Gyair−1 cm−2 at an electric field of 1.2 × 104 V cm−1 and a detection limit in the sub µGyair s−1 regime is demonstrated. The high crystallinity and chemical purity of the melt processed CsPbBr3 films are suggested to be responsible for a performance which is on par to current state‐of‐the‐art Cd(Zn)Te based X‐ray detector technology.

show abstract

Section: Resultssupporting

confidence: 84%

Sensitive Direct Converting X‐Ray Detectors Utilizing Crystalline CsPbBr₃ Perovskite Films Fabricated via Scalable Melt Processing

Matt

Levchuk

Knüttel

et al. 2020

Adv Materials Inter

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show abstract

“…The long first‐order lifetimes τ 1 = k 1 −1 ≈0.1–1 μs are indicative of the absence of deep defect states, which have high formation energies in MHPs . In MHP bulk systems, lower first‐order recombination rates and conversely long minority carrier lifetimes obtained from time‐resolved PL (

τ_{a v g} \approx k_{1}^{- 1}

) are indicators of a low defect concentration and desirable in both LEDs and solar cells.…”

Section: Charge‐carrier Generation and Recombination Kineticsmentioning

confidence: 55%

Polaronic Charge Carrier–Lattice Interactions in Lead Halide Perovskites

et al. 2017

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Almost ten years after the renaissance of the popular perovskite‐type semiconductors based on lead salts with the general formula AMX3 (A=organic or inorganic cation; M=divalent metal; X=halide), many facets of photophysics continue to puzzle researchers. In this Minireview, light is shed on the low mobilities of charge carriers in lead halide perovskites with special focus on the lattice properties at non‐zero temperature. The polar and soft lattice leads to pronounced electron‐phonon coupling, limiting carrier mobility and retarding recombination. We propose that the proper picture of excited charge carriers at temperature ranges that are relevant for device operations is that of a polaron, with Fröhlich coupling constants between 1<α<3. Under the aspect of light‐emitting diode application, APbX3 perovskite show moderate second order (bimolecular) recombination rates and high third‐order (Auger) rate constants. It has become apparent that this is a direct consequence of the anisotropic polar A‐site cation in organic–inorganic hybrid perovskites and might be alleviated by replacing the organic moiety with an isotropic cation.

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“…27), MAPbBr 3 (refs 52, 53), CsPbBr 3 (refs 54, 55) as 13 meV, 18 meV and 16 meV, respectively, by taking into account both the experimental and theoretical estimations performed before and also the band structure we presented in Fig. 3.…”

Section: Resultsmentioning

confidence: 99%

Acoustic-optical phonon up-conversion and hot-phonon bottleneck in lead-halide perovskites

et al. 2017

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The hot-phonon bottleneck effect in lead-halide perovskites (APbX3) prolongs the cooling period of hot charge carriers, an effect that could be used in the next-generation photovoltaics devices. Using ultrafast optical characterization and first-principle calculations, four kinds of lead-halide perovskites (A=FA+/MA+/Cs+, X=I−/Br−) are compared in this study to reveal the carrier-phonon dynamics within. Here we show a stronger phonon bottleneck effect in hybrid perovskites than in their inorganic counterparts. Compared with the caesium-based system, a 10 times slower carrier-phonon relaxation rate is observed in FAPbI3. The up-conversion of low-energy phonons is proposed to be responsible for the bottleneck effect. The presence of organic cations introduces overlapping phonon branches and facilitates the up-transition of low-energy modes. The blocking of phonon propagation associated with an ultralow thermal conductivity of the material also increases the overall up-conversion efficiency. This result also suggests a new and general method for achieving long-lived hot carriers in materials.

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Excitonic emissions and above-band-gap luminescence in the single-crystal perovskite semiconductorsCsPbBr3andCsPbCl3

Abstract: 8The ternary compounds CsPbX3 (X= Br or Cl) have perovskite structures that are being 9 considered for optical and electronic applications such as lasing and gamma ray detection. 10Above bandgap excitonic photoluminescence (PL) band is seen in both CsPbX3 compounds. An

Cited by 281 publications

References 73 publications

Sensitive Direct Converting X‐Ray Detectors Utilizing Crystalline CsPbBr₃ Perovskite Films Fabricated via Scalable Melt Processing

Sensitive Direct Converting X‐Ray Detectors Utilizing Crystalline CsPbBr₃ Perovskite Films Fabricated via Scalable Melt Processing

Polaronic Charge Carrier–Lattice Interactions in Lead Halide Perovskites

Acoustic-optical phonon up-conversion and hot-phonon bottleneck in lead-halide perovskites

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Excitonic emissions and above-band-gap luminescence in the single-crystal perovskite semiconductorsCsPbBr3andCsPbCl3

Abstract: 8The ternary compounds CsPbX3 (X= Br or Cl) have perovskite structures that are being 9 considered for optical and electronic applications such as lasing and gamma ray detection. 10Above bandgap excitonic photoluminescence (PL) band is seen in both CsPbX3 compounds. An

Cited by 281 publications

References 73 publications

Sensitive Direct Converting X‐Ray Detectors Utilizing Crystalline CsPbBr3 Perovskite Films Fabricated via Scalable Melt Processing

Sensitive Direct Converting X‐Ray Detectors Utilizing Crystalline CsPbBr3 Perovskite Films Fabricated via Scalable Melt Processing

Polaronic Charge Carrier–Lattice Interactions in Lead Halide Perovskites

Acoustic-optical phonon up-conversion and hot-phonon bottleneck in lead-halide perovskites

Contact Info

Product

Resources

About

Sensitive Direct Converting X‐Ray Detectors Utilizing Crystalline CsPbBr₃ Perovskite Films Fabricated via Scalable Melt Processing

Sensitive Direct Converting X‐Ray Detectors Utilizing Crystalline CsPbBr₃ Perovskite Films Fabricated via Scalable Melt Processing