Soft Phonon Mode and the Anomalous Temperature Dependence of Band Gap in AgGaS
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Choi, In–Hwan; Eom, Sung‐Hwan; Yu, Peter Y.

doi:10.1002/(sici)1521-3951(199909)215:1<99::aid-pssb99>3.0.co;2-#

Cited by 8 publications

(2 citation statements)

References 12 publications

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“…However, accounting for all possible phonon branches throughout the Brillouin zone is often unnecessary in modeling the behavior of real systems. Instead, one 27 or two 20 vibrational modes are usually assumed dominant (referred to as one-oscillator and two-oscillator models) which reduces the summation to either one or two terms respectively.…”

Section: Results and Discusssionmentioning

confidence: 99%

Effect of dimensionality on the optical absorption properties of CsPbI3 perovskite nanocrystals

Liu

Bonato

Sessa

et al. 2019

The Journal of Chemical Physics

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The band-gaps of CsPbI 3 perovskite nanocrystals are measured by absorption spectroscopy at cryogenic temperatures. Anomalous band-gap shifts are observed in CsPbI 3 nanocubes and nanoplatelets, which are modeled accurately by band-gap renormalization due to lattice vibrational modes. We find that decreasing dimensionality of the CsPbI 3 lattice in nanoplatelets greatly reduces electron-phonon coupling, and dominant out-of-plane quantum confinement results in a homogeneously broadened absorption lineshape down to cryogenic temperatures. An absorption tail forms at lowtemperatures in CsPbI 3 nanocubes, which we attribute to shallow defect states positioned near the valence band-edge.

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Section: Results and Discusssionmentioning

confidence: 99%

Effect of dimensionality on the optical absorption properties of CsPbI3 perovskite nanocrystals

Liu

Bonato

Sessa

et al. 2019

The Journal of Chemical Physics

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“…The PL band of AgGaS 2 could be attributed to donor-acceptor pair's recombination (DAP) [35]. According to Hawn-Choi et al's work [36], the energy of photons emitted by DAP recombinations is given in first approximation by the equation:…”

Section: Optical Properties Of Aggas 2 Nanomaterialsmentioning

confidence: 99%

Controlled synthesis of monodispersed AgGaS2 3D nanoflowers and the shape evolution from nanoflowers to colloids

Yuan

Zai

et al. 2011

Journal of Solid State Chemistry

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Dependence of Crystal‐Field Energy on Strain/Stress Sensed by Temperature Variation of Chalcopyrite Semiconductor (Optical) Band‐Gap for Efficient Band‐Gap Tuning in the CIS/CIGS Photovoltaic

Papadimitriou

2024

Physica Status Solidi (b)

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Chalcopyrite selenide single crystals and epitaxial layers (CuIn1−xGaxSe2, x = 0.00, 0.08, 0.19, 1.00) were characterized by temperature‐dependent photoreflectance (PR), photoluminescence (PL), photoluminescence–excitation (PLE), and variable excitation‐energy photoluminescence (VEPL) spectroscopy. The transition energies Ea, Eb, and Ec of both CuInSe2 (CIS) and CuGaSe2 (CGS) layers sensed by PR were higher than the energies of single crystals. CuInSe2 and CuGaSe2 grown on GaAs(001) underlie compressive and tensile stresses, respectively, which lead to band‐gap broadening in CIS and band‐gap narrowing in CGS. The increase of the Ea, Eb, Ec energies of tensely stressed CuGaSe2 layers to energies higher than those of the bulk originates from the stress dependence of the non‐cubic crystal field. Band‐gap scanning of the CuGaSe2 layer with continuous‐wave Ti:sapphire‐laser confirmed the absence of correlation between band‐gap readjustment and intrinsic defects. The energy of the band‐edge exciton EFE, in the PL‐spectra, was lower than the Ea transition energy, in the PR‐spectra, which is assigned to partial quenching of ΔCF with the increase of external tensile stress by gallium‐segregation at the chalcopyrite/GaAs‐interface. The stress dependence of ΔCF is negligible in CuInSe2 and linear, with a rate of 9 meV/100 MPa, in CuGaSe2. It is revealed that the energy band‐gap of photovoltaic chalcopyrite absorbers can be tuned by simultaneous built‐in and external lattice‐tuning.

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Soft Phonon Mode and the Anomalous Temperature Dependence of Band Gap in AgGaS ₂

Cited by 8 publications

References 12 publications

Effect of dimensionality on the optical absorption properties of CsPbI3 perovskite nanocrystals

Effect of dimensionality on the optical absorption properties of CsPbI3 perovskite nanocrystals

Controlled synthesis of monodispersed AgGaS2 3D nanoflowers and the shape evolution from nanoflowers to colloids

Dependence of Crystal‐Field Energy on Strain/Stress Sensed by Temperature Variation of Chalcopyrite Semiconductor (Optical) Band‐Gap for Efficient Band‐Gap Tuning in the CIS/CIGS Photovoltaic

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Soft Phonon Mode and the Anomalous Temperature Dependence of Band Gap in AgGaS 2

Cited by 8 publications

References 12 publications

Effect of dimensionality on the optical absorption properties of CsPbI3 perovskite nanocrystals

Effect of dimensionality on the optical absorption properties of CsPbI3 perovskite nanocrystals

Controlled synthesis of monodispersed AgGaS2 3D nanoflowers and the shape evolution from nanoflowers to colloids

Dependence of Crystal‐Field Energy on Strain/Stress Sensed by Temperature Variation of Chalcopyrite Semiconductor (Optical) Band‐Gap for Efficient Band‐Gap Tuning in the CIS/CIGS Photovoltaic

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Soft Phonon Mode and the Anomalous Temperature Dependence of Band Gap in AgGaS ₂