Hole and Electron Effective Masses in Single InP Nanowires with a Wurtzite-Zincblende Homojunction

Tedeschi, Davide; Fonseka, H. Aruni; Blundo, Elena; Águila, Andrés Granados del; Guo, Yanan; Tan, Hark Hoe; Christianen, Peter C. M.; Jagadish, Chennupati; Polimeni, A.; Luca, Marta De

doi:10.1021/acsnano.0c04174

Cited by 12 publications

(11 citation statements)

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“…35,42 The energy splittings are Δ AB ≅ 120 meV and Δ AC ≅ 300 meV, much larger compared to the reported bulk splitting value (Δ AB Bulk = 30−50 meV and Δ AC Bulk = 160−200 meV). 39,40,43,44 This is consistent with quantum confinement effect in our system. To verify this, we have performed an uncoupled band effective mass simulation to predict the A, B, and C transitions energies using Comsol (see SI).…”

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confidence: 91%

“…To verify this, we have performed an uncoupled band effective mass simulation to predict the A, B, and C transitions energies using Comsol (see SI). In our simulation, we have used recently reported values for the wurtzite HH and LH effective masses of InP ( m HH = 0.49 and m LH = 0.21) . Since there are no reports about the wurtzite SO effective mass, we have used m SO = 0.17, an average of the reported values for the cubic phase ( m SO = 0.12–0.21). , As for the bulk energy spacing between the HH, LH, and SO bands, we have used the values Δ AB Bulk = 40 meV and Δ AC Bulk = 172 meV .…”

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confidence: 99%

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Luminescent Anisotropic Wurtzite InP Nanocrystals

et al. 2021

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Indium phosphide (InP) nanocrystals are emerging as an alternative to heavy metal containing nanocrystals for optoelectronic applications but lag behind in terms of synthetic control. Herein, luminescent wurtzite InP nanocrystals with narrow size distribution were synthesized via a cation exchange reaction from hexagonal Cu3P nanocrystals. A comprehensive surface treatment with NOBF4 was performed, which removes excess copper while generating stoichiometric In/P nanocrystals with fluoride surface passivation. The attained InP nanocrystals manifest a highly resolved absorption spectrum with a narrow emission line of 80 meV, and photoluminescence quantum yield of up to 40%. Optical anisotropy measurements on ensemble and single particle bases show the occurrence of polarized transitions directly mirroring the anisotropic wurtzite lattice, as also manifested from modeling of the quantum confined electronic levels. This shows a green synthesis path for achieving wurtzite InP nanocrystals with desired optoelectronic properties including color purity and light polarization with potential for diverse optoelectronic applications.

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Luminescent Anisotropic Wurtzite InP Nanocrystals

et al. 2021

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“…Under this assumption, a common scattering time of 120 fs and a reduced effective mass

1 / m_{r}^{*} = 1 / m_{e}^{*} + 1 / m_{h}^{*}

of 0.085 are retrieved from fitting the measured sum mobility spectrum, which is close to the literature values of ≈0.07. [ 40 ] Additionally, a DC value of 2900 cm 2 V −1 s −1 for the sum of electron mobility and hole mobility is gained. Taking advantage of a previous density functional theory (DFT) calculation of the ratio of the effective masses of holes and electrons of 7.5 allows separating an individual electron DC‐mobility of 2470 cm 2 V −1 s −1 and a hole DC‐mobility of 330 cm 2 V −1 s −1 .…”

Section: Modeling Device Transport From Gigahertz and Terahertz Mobil...mentioning

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Predicting Solar Cell Performance from Terahertz and Microwave Spectroscopy

Hempel

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Stolterfoht

et al. 2022

Advanced Energy Materials

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Mobilities and lifetimes of photogenerated charge carriers are core properties of photovoltaic materials and can both be characterized by contactless terahertz or microwave measurements. Here, the expertise from fifteen laboratories is combined to quantitatively model the current‐voltage characteristics of a solar cell from such measurements. To this end, the impact of measurement conditions, alternate interpretations, and experimental inter‐laboratory variations are discussed using a (Cs,FA,MA)Pb(I,Br)3 halide perovskite thin‐film as a case study. At 1 sun equivalent excitation, neither transport nor recombination is significantly affected by exciton formation or trapping. Terahertz, microwave, and photoluminescence transients for the neat material yield consistent effective lifetimes implying a resistance‐free JV‐curve with a potential power conversion efficiency of 24.6 %. For grainsizes above ≈20 nm, intra‐grain charge transport is characterized by terahertz sum mobilities of ≈32 cm2 V−1 s−1. Drift‐diffusion simulations indicate that these intra‐grain mobilities can slightly reduce the fill factor of perovskite solar cells to 0.82, in accordance with the best‐realized devices in the literature. Beyond perovskites, this work can guide a highly predictive characterization of any emerging semiconductor for photovoltaic or photoelectrochemical energy conversion. A best practice for the interpretation of terahertz and microwave measurements on photovoltaic materials is presented.

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“…The vapor–liquid–solid (VLS) method using catalytic seeds has been widely used to grow nanostructures of covalent crystalline group IV or III–V semiconductors with a high degree of structure engineering (e.g., phase, composition, and orientation) − and correspondingly tunable properties such as photon, electron, and phonon transport. ,, Recently, the VLS method has been expanded to other material systems, specifically with 2D-layered geometries, including GeS, GeSe, GaS, and GaSe. − Taking advantage of a kinetically driven growth process, these anisotropic 2D-layered materials can be prepared in twisted nanowires or ribbon-like morphologies with unique properties. The GeS vdW layers grown with Au catalysts display helical nanowire growth with continuous interlayer twists, suggesting tunable optical/thermal conductivity .…”

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Br-Induced Orientation Control of PbI₂ van der Waals Nanowires and Their Optoelectronics

2021

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van der Waals (vdW)-layered direct bandgap semiconductor materials such as lead iodide (PbI 2 ) possess highly anisotropic optoelectronic properties that are dependent on their layer stacking orientations. Here, we report an in situ control of PbI 2 layer growth orientation, or stacking axis, via the vapor− liquid−solid (VLS) growth. The PbI 2 vdW nanowires initially grow with transverse stacking relative to the [0001]-oriented growing axis, and the controlled introduction of PbBr 2 induces threedimensional twin formation, which is responsible for the change in the layer stacking axis (i.e., kinking). By varying the duration of the PbBr 2 introduction, two different types of kinking modes are confirmed: Type I kink in parallel with the twin boundary (TB) propagation accompanying two mirrored stacking c-axes and Type II kink, in which the layers are stacked parallel to the growing segment. Optoelectronic analyses using photoluminescence and cathodoluminescence reveal that the kinked PbI 2 nanostructures exhibit asymmetric band-edge excitonic emission profiles, which are distinct from those of the single-oriented nanowires. These results demonstrate a new methodology to modulate the structuredependent optoelectronic/photonic properties, as well as phonon transport, which cannot be achieved using conventional 2D design platforms for the vdW-layered materials.

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Hole and Electron Effective Masses in Single InP Nanowires with a Wurtzite-Zincblende Homojunction

Abstract: Please refer to published version for the most recent bibliographic citation information. If a published version is known of, the repository item page linked to above, will contain details on accessing it.

Cited by 12 publications

References 49 publications

Luminescent Anisotropic Wurtzite InP Nanocrystals

Luminescent Anisotropic Wurtzite InP Nanocrystals

Predicting Solar Cell Performance from Terahertz and Microwave Spectroscopy

Br-Induced Orientation Control of PbI₂ van der Waals Nanowires and Their Optoelectronics

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Hole and Electron Effective Masses in Single InP Nanowires with a Wurtzite-Zincblende Homojunction

Abstract: Please refer to published version for the most recent bibliographic citation information. If a published version is known of, the repository item page linked to above, will contain details on accessing it.

Cited by 12 publications

References 49 publications

Luminescent Anisotropic Wurtzite InP Nanocrystals

Luminescent Anisotropic Wurtzite InP Nanocrystals

Predicting Solar Cell Performance from Terahertz and Microwave Spectroscopy

Br-Induced Orientation Control of PbI2 van der Waals Nanowires and Their Optoelectronics

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Br-Induced Orientation Control of PbI₂ van der Waals Nanowires and Their Optoelectronics