Real-Time Electron and Hole Transport Dynamics in Halide Perovskite Nanowires

Janker, Lisa; Polavarapu, Lakshminarayana; Feldmann, Jochen; Urban, Alexander S.; Krenner, Hubert J.

doi:10.1021/acs.nanolett.9b03396

Cited by 17 publications

(21 citation statements)

References 48 publications

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“…The mobility value found here is in good agreement with values reported in literature, [ 36,38,39 ] although differs from others. [ 17,40 ] We note that differences in crystallinity and composition (i.e., exchanging halide species), as well as measurement schemes, could alter the mobility values. Simulation curves for different values of μ are shown in Note VI, Supporting Information and illustrate the close relationship between the delayed PL “hump” and carrier diffusion.…”

Section: Resultsmentioning

confidence: 99%

Deconvoluting Energy Transport Mechanisms in Metal Halide Perovskites Using CsPbBr₃ Nanowires as a Model System

Oksenberg

Fai

Scheblykin

et al. 2021

Adv Funct Materials

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Understanding energy transport in metal halide perovskites is essential to effectively guide further optimization of materials and device designs. However, difficulties to disentangle charge carrier diffusion, photon recycling, and photon transport have led to contradicting reports and uncertainty regarding which mechanism dominates. In this study, monocrystalline CsPbBr 3 nanowires serve as 1D model systems to help unravel the respective contribution of energy transport processes in metal-halide perovskites. Spatially, temporally, and spectrally resolved photoluminescence (PL) microscopy reveals characteristic signatures of each transport mechanism from which a robust model describing the PL signal accounting for carrier diffusion, photon propagation, and photon recycling is developed. For the investigated CsPbBr 3 nanowires, an ambipolar carrier mobility of μ = 35 cm 2 V −1 s −1 is determined, and is found that charge carrier diffusion dominates the energy transport process over photon recycling. Moreover, the general applicability of the developed model is demonstrated on different perovskite compounds by applying it to data provided in previous related reports, from which clarity is gained as to why conflicting reports exist. These findings, therefore, serve as a useful tool to assist future studies aimed at characterizing energy transport mechanisms in semiconductor nanowires using PL.

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Section: Resultsmentioning

confidence: 99%

Deconvoluting Energy Transport Mechanisms in Metal Halide Perovskites Using CsPbBr₃ Nanowires as a Model System

Oksenberg

Fai

Scheblykin

et al. 2021

Adv Funct Materials

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“…[ 11 ] In other CsPbBr 3 systems higher FET mobilities with record values of up to 2.2 cm 2 V −1 s −1 at room temperature have been reported. [ 12,28,29,39 ] However, even these record mobilities are still at well below what has been expected from time‐resolved photoluminescence measurements, [ 7,40 ] acousto–optoelectronic spectroscopy, [ 41 ] Hall‐effect measurements, [ 36,42 ] and THz spectroscopy. [ 43 ] Thus, a better understanding of the underlying transport mechanisms bears great potential for optimizing mobilities of all‐inorganic perovskite devices.…”

Section: Resultsmentioning

confidence: 99%

Charge Traps in All‐Inorganic CsPbBr₃ Perovskite Nanowire Field‐Effect Phototransistors

Winterer¹,

Walter²,

Lenz³

et al. 2021

Adv Elect Materials

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All‐inorganic halide perovskite materials have recently emerged as outstanding materials for optoelectronic applications. However, although critical for developing novel technologies, the influence of charge traps on charge transport in all‐inorganic systems still remains elusive. Here, the charge transport properties in cesium lead bromide, nanowire films are probed using a field‐effect transistor geometry. Field‐effect mobilities of μFET = 4 × 10−3 cm−2 V−1 s−1 and photoresponsivities in the range of R = 25 A W−1 are demonstrated. Furthermore, charge transport both with and without illumination is investigated down to cryogenic temperatures. Without illumination, deep traps dominate transport and the mobility freezes out at low temperatures. Despite the presence of deep traps, when illuminating the sample, the field‐effect mobility increases by several orders of magnitude and even phonon‐limited transport characteristics are visible. This can be seen as an extension to the notion of “defect tolerance” of perovskite materials that has solely been associated with shallow traps. These findings provide further insight in understanding charge transport in perovskite materials and underlines that managing deep traps can open up a route to optimizing optoelectronic devices such as solar cells or phototransistors operable also at low light intensities.

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“…While as bulk crystal they are discussed as solar cell material, [174] nanowires have already been interfaced with SAWs utilizing the strain mediated charge transport. [175] Studies have also shown that perovskite nanocrystals show single photon emission and therefore act as artificial atoms. [176,177] The detection of acoustic phonon sidebands [178] makes them also promising candidates for active remote phonon control.…”

Section: Artificial Atoms In Layered Materialsmentioning

confidence: 99%

Remote Phonon Control of Quantum Dots and Other Artificial Atoms

2021

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To exploit the full potential of chips for quantum technologies, it is worth considering all possible opportunities offered by the solid state. The aspect covered in this article is the use of phononic fields to remotely influence the optical properties of artificial atoms. The three most commonly used strain sources are discussed, that is, mechanical resonators, surface acoustic waves, and picosecond acoustic pulses. All three platforms are routinely interfaced with quantum dots and other qubits in basic research, which renders a first step toward large scale implementation in quantum applications. A central question regarding the interaction between lattice oscillations and the optically active artificial atoms deals with the characteristic time scales of the two components. The influence of this aspect on the expected optical response on the phononic driving is discussed. Besides well known semiconducting quantum dots and color centers that typically operate in the visible spectral range, the more recently discovered artificial atoms in layered van der Waals materials are discussed. Due to their flexibility and robustness, these crystals promise vast opportunities for future applications. Another important building block lies in superconducting qubits that allow to resonantly generate quantum phonon states and therefore establish the field of quantum acoustics.

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Real-Time Electron and Hole Transport Dynamics in Halide Perovskite Nanowires

Cited by 17 publications

References 48 publications

Deconvoluting Energy Transport Mechanisms in Metal Halide Perovskites Using CsPbBr₃ Nanowires as a Model System

Deconvoluting Energy Transport Mechanisms in Metal Halide Perovskites Using CsPbBr₃ Nanowires as a Model System

Charge Traps in All‐Inorganic CsPbBr₃ Perovskite Nanowire Field‐Effect Phototransistors

Remote Phonon Control of Quantum Dots and Other Artificial Atoms

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Real-Time Electron and Hole Transport Dynamics in Halide Perovskite Nanowires

Cited by 17 publications

References 48 publications

Deconvoluting Energy Transport Mechanisms in Metal Halide Perovskites Using CsPbBr3 Nanowires as a Model System

Deconvoluting Energy Transport Mechanisms in Metal Halide Perovskites Using CsPbBr3 Nanowires as a Model System

Charge Traps in All‐Inorganic CsPbBr3 Perovskite Nanowire Field‐Effect Phototransistors

Remote Phonon Control of Quantum Dots and Other Artificial Atoms

Contact Info

Product

Resources

About

Deconvoluting Energy Transport Mechanisms in Metal Halide Perovskites Using CsPbBr₃ Nanowires as a Model System

Deconvoluting Energy Transport Mechanisms in Metal Halide Perovskites Using CsPbBr₃ Nanowires as a Model System

Charge Traps in All‐Inorganic CsPbBr₃ Perovskite Nanowire Field‐Effect Phototransistors