Optical properties of CuCl films on silicon substrates

Mitra, Anirban; O'Reilly, Lisa; Lucas, O. F.; Natarajan, Gomathi; Danieluk, D.; Bradley, A. Louise; McNally, Patrick J.; Daniels, Stephen; Cameron, D.C.; Reader, A. H.; Martinez-Rosas, M.

doi:10.1002/pssb.200844021

Cited by 7 publications

(11 citation statements)

References 37 publications

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“…It has a high exciton binding energy of~190 meV [2], which is higher than both GaN (25 meV) [3] or ZnO (60 meV) [4]. CuCl has been investigated for some time for its application to optoelectronic devices [5][6][7][8]. The high binding energy gives the possibility of stable, room temperature, UV emission which, together with high biexciton binding energies, enables optoelectronic effects such as bistability and four-wave mixing with the potential for new short wavelength devices [9,10].…”

Section: Introductionmentioning

confidence: 99%

Structural and Optical Properties of Luminescent Copper(I) Chloride Thin Films Deposited by Sequentially Pulsed Chemical Vapour Deposition

et al. 2018

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Sequentially pulsed chemical vapour deposition was used to successfully deposit thin nanocrystalline films of copper(I) chloride using an atomic layer deposition system in order to investigate their application to UV optoelectronics. The films were deposited at 125 °C using [Bis(trimethylsilyl)acetylene](hexafluoroacetylacetonato)copper(I) as a Cu precursor and pyridine hydrochloride as a new Cl precursor. The films were analysed by XRD, X-ray photoelectron spectroscopy (XPS), SEM, photoluminescence, and spectroscopic reflectance. Capping layers of aluminium oxide were deposited in situ by ALD (atomic layer deposition) to avoid environmental degradation. The film adopted a polycrystalline zinc blende-structure. The main contaminants were found to be organic materials from the precursor. Photoluminescence showed the characteristic free and bound exciton emissions from CuCl and the characteristic exciton absorption peaks could also be detected by reflectance measurements.

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Section: Introductionmentioning

confidence: 99%

Structural and Optical Properties of Luminescent Copper(I) Chloride Thin Films Deposited by Sequentially Pulsed Chemical Vapour Deposition

et al. 2018

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“…2(f) in blue dots. On the other hand, ℏ Γ can be expressed as ℏ Γ( T ) = ℏγ ac T + ℏ Γ op /[exp[ mℏΩ LO /( k B T )] − 1]( m ∈ ) 25 , where Ω LO is the longitudinal optical (LO) phonon frequency, ℏγ ac is the coupling strength of the exciton–acoustic phonon interaction, ℏ Γ op is a parameter describing the strength of the exciton–LO phonon interaction, k B is the Boltzmann constant, and T is the temperature. The curve corresponding to this equation is also plotted in Fig.…”

Section: Discussionmentioning

confidence: 99%

“…2(f) with the parameters in ref. 25 : , and ℏ Γ op = 976 meV. The number m = 3 suggests that the exciton–LO phonon interactions involve almost three phonons 26 .…”

Section: Discussionmentioning

confidence: 99%

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Ultrafast thermal-free photoluminescence of coherently extended single quantum states

Matsuda

Ichimiya

Ashida

et al. 2019

Sci Rep

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The coherent volume of single quantum states of matter is typically smaller than that of photons by several orders of magnitude, and hence, interactions between photons and single quantum states are normally very weak. This limits the speed of radiative decay of matter states in free space. Recent efforts to speed-up radiative processes have been focused on creating a small mode volume of photons using cavity systems, or on realizing spontaneous synchronization among quantum emitters to create a dipole at the macroscopic scale, which accelerates photon emission up to a couple of hundred femtoseconds. Here, we demonstrate the 10-fs class of photoluminescence (PL) of a single quantum state in solid thin films without the use of a photo-cavity system or the spontaneous synchronization effect. Significantly, this speed can beat thermal dephasing of relevant excited states at room temperature, which is typically a couple of tens of femtoseconds. The process occurs due to the giant interaction volume between light waves and the multipole excitonic waves. This result indicates the possibility to realize photoemission processes that complete before the thermal dephasing process activates, which opens up the hidden potential of ubiquitous solids as thermal-free or extremely low-energy-loss photonic materials.

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“…CuCl luminescence has been investigated extensively for many years, owing to its interesting structural, optical and electrical properties [1][2][3][4][5][6]. It is an ionic I-VII compound wide direct band gap semiconductor material with the zinc blende structure.…”

Section: Introductionmentioning

confidence: 99%

Temperature dependent photoluminescence of nanocrystalline γ-CuCl hybrid films

et al. 2014

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Organic-inorganic hybrid films combine the basic properties of organic and inorganic materials and offer special advantages that enhance optical, thermal and mechanical properties. We have studied the temperature dependent photoluminescence (PL) of nanocrystalline γ-CuCl hybrid films from 15 K to room temperature in order to investigate the electronic transitions of the hybrid films. The I 1 impurity bound exciton peak is the most intense emission peak at 15 K but the peak intensity decreases rapidly with increasing temperature due to the low binding energy of this exciton bound to an impurity center and above 80 K all three excitonic and biexcitonic peaks, except the Z 3 free exciton emission peak disappeared. The biexciton emission peak intensity follows a quadratic dependency on power in the excitation power range b 10 kWcm −2 . The integrated Z 3 excitonic PL intensity is almost independent of the temperature below 80 K, while above 100 K the PL emission intensity decreases rapidly. Thermal quenching of the Z 3 free exciton PL emission in hybrid films has been observed. The full width at half maximum (FWHM) of the free exciton peak was investigated as a function of temperature and was explained by a theoretical model which considers the scattering of excitons with acoustic phonons and longitudinal optical phonons. The FWHM of the Z 3 free exciton emission peak increases with increasing temperature, and a value of~76 meV was deduced for the FWHM at room temperature, which is comparatively better than ZnO (106 meV) and GaN (100 meV) nanostructures. The Z 3 free exciton energy of the hybrid films exhibits a blue shift of 3 meV at 15 K compared to the bulk CuCl samples which may be due to a dead layer effect near the CuCl nanocrystal surface. The exciton energy also presents a blue shift of~41 meV with increasing temperature from 15 K to room temperature. The results obtained for the γ-CuCl hybrid films are comparable to those of vacuum evaporated and sputtered CuCl films reported in the literature.

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Optical properties of CuCl films on silicon substrates

Cited by 7 publications

References 37 publications

Structural and Optical Properties of Luminescent Copper(I) Chloride Thin Films Deposited by Sequentially Pulsed Chemical Vapour Deposition

Structural and Optical Properties of Luminescent Copper(I) Chloride Thin Films Deposited by Sequentially Pulsed Chemical Vapour Deposition

Ultrafast thermal-free photoluminescence of coherently extended single quantum states

Temperature dependent photoluminescence of nanocrystalline γ-CuCl hybrid films

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