Radiative recombination in a-Si1−xCx:H films

Chernyshov, S. V.; Теруков, Е. И.; Vassilyev, V.A.; Волков, А. С.

doi:10.1016/0022-3093(91)90379-k

Cited by 77 publications

(19 citation statements)

References 25 publications

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“…This a-C:H PL effect has been previously observed (e.g. Chernyshov et al 1991;Rusli et al 1996;Pócsik & Koós 2001).…”

Section: Photoluminescence Excitationsupporting

confidence: 81%

“…The a-C:H PL quantum yield should thus increase at lower temperatures but probably not so much because the PL temperature dependence of a-C:H is weak. Chernyshov et al (1991) also observed a small narrowing of the PL band for low temperatures, but no change in the PL spectrum shape is observed by others.…”

Section: 5mentioning

confidence: 46%

“…Variation in the a-C:H photoluminescence color with the material optical gap E 04 . Our a-C:H samples (filled colored circles, each color corresponding to an a-C:H sample) are plotted with other a-C:H photoluminescence studies (other black symbols) for comparison (Watanabe et al 1982;Wagner & Lautenschlager 1986;Chernyshov et al 1991;Yoshimi et al 1992;Xu et al 1993;Rusli et al 1996). The dotted line is a fit to the data.…”

Section: Resultsmentioning

confidence: 99%

“…The a-C:H PL data are those presented in Fig. 10 of this paper, together with data from Lin & Feldman (1982), Lin & Feldman (1983), Watanabe et al (1982), Wagner & Lautenschlager (1986), Chernyshov et al (1991), Xu et al (1993), Rusli et al (1996), Ledoux et al (2001), and Dartois et al (2005). The ERE observations data are taken from Fig.…”

Section: Photoluminescence Spectramentioning

confidence: 99%

“…One can wonder whether the difference between ISM temperature and room temperature have any impact on the PL of interstellar a-C:H dust. Watanabe et al (1982), Lin & Feldman (1983), Chernyshov et al (1991), and Xu et al (1993) have studied the temperature's influence on the a-C:H PL and conclude that the PL intensity increases when the sample temperature decreases, but this increase is moderate compared to other materials such as a-Si:H for which Chernyshov et al (1991) observed an PL intensity increase of more than four magnitude orders between room temperature and 50 K. Nevertheless, an intensity increases by a factor lower than or equal to two is observed when temperature falls from 350 K to 2 K, except for one of the of Xu et al samples for which the PL efficiency increases by a factor of ten when cooling the sample from 300 K to 120 K. Xu et al (1993) show that this enhancement of PL efficiency does not affect all a-C:H samples in the same way. This efficiency gain is concomitant to a reduction of the fatiguing effect at lower temperatures.…”

Section: 5mentioning

confidence: 99%

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Photoluminescence of hydrogenated amorphous carbons

Godard

Dartois

2010

A&A

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Context. Hydrogenated amorphous carbons (a-C:H or HAC) have proved to be excellent analogs of interstellar dust observed in galaxies diffuse interstellar medium (DISM) through infrared vibrational absorption bands (3.4 μm, 6.8 μm, and 7.2 μm bands). They exhibit photoluminescence (PL) after excitation by UV-visible photons, and are possible carriers for the extended red emission (ERE), a broad red emission band observed in various interstellar environments. Aims. As many candidate materials/molecules can photoluminesce in the visible, along with the carrier abundance, the PL efficiency represents one of the strongest constraints set by such ERE observations. We wish to precisely characterize the PL behavior of a-C:H as a family of materials. Methods. The a-C:H samples are produced in the form of films deposited on substrates by plasma-enhanced chemical vapor deposition. The produced films were analyzed in transmission by UV-visible and IR spectroscopy, and the wavelength dependent PL spectra were recorded. The intrinsic absolute quantum yield η was then rigorously calculated taking self-absorption of the PL by the film and interfaces effects into account. Results. A wide range of different laboratory synthesized a-C:H were analyzed. Their PL properties are dependent on the optical gap E 04 : when E 04 decreases from 4.3 eV to 2.8 eV, the a-C:H vary from highly (η ∼ 1%) yellow photoluminescent soft materials to hard materials that emit a wider PL band in the red spectral range, with a lower efficiency (η ∼ 0.01−0.1%). For any given a-C:H, the PL characteristics (central wavelength, band width and efficiency) are found to be essentially constant over the explored excitation range (λ exc > ∼ 250 nm). We compared the characteristics of the produced interstellar dust analog to the constraints imposed by the ERE observations. Conclusions. As for ERE observations, PL efficiencies and band widths of a-C:H are both correlated to the PL central wavelengths. The excitation responsible for the a-C:H emission is efficient over a wide spectral range that matches the ERE excitation. The present a-C:H encounter difficulties for the diffuse ISM ERE observations (η ≥ 10%) in simultaneously satisfying the high quantum yield criteria and PL spectral characteristics. We still need to investigate the role of a small number of residual oxygen atoms in the laboratory-produced a-C:H network in quenching the PL yield, as well as to consider the interstellar temperature effect for our analogs.

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“…This a-C:H PL effect has been previously observed (e.g. Chernyshov et al 1991;Rusli et al 1996;Pócsik & Koós 2001).…”

Section: Photoluminescence Excitationsupporting

confidence: 81%

Section: 5mentioning

confidence: 46%

Section: Resultsmentioning

confidence: 99%

Section: Photoluminescence Spectramentioning

confidence: 99%

Section: 5mentioning

confidence: 99%

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Photoluminescence of hydrogenated amorphous carbons

Godard

Dartois

2010

A&A

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Defects in Diamond-Like Carbon

Robertson

2001

phys. stat. sol. (a)

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The nature and role of electronic defects in amorphous diamond-like carbons (DLC) is described. The defect has recently been shown by electron spin resonance to be an unpaired spin on a small sp 2 -bonded cluster. The defect density is large in DLC so defect states form continuous distribution of states with tail states. Defects and tail states can act as non-radiative recombination centres to quench photoluminescence, depending on the position of the demarcation levels.

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Photoluminescence in Hydrogenated Amorphous Carbon

Koós

Pócsik

1997

Physics and Applications of Non-Crystalline Semiconductors in Optoelectronics

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Radiative recombination in a-Si1−xCx:H films

Cited by 77 publications

References 25 publications

Photoluminescence of hydrogenated amorphous carbons

Photoluminescence of hydrogenated amorphous carbons

Defects in Diamond-Like Carbon

Photoluminescence in Hydrogenated Amorphous Carbon

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