scholarly journals The visible and near-infrared optical absorption coefficient spectrum of Parylene C measured by transmitting light through thin films in liquid filled cuvettes

2021 ◽  
Author(s):  
James Guggenheim ◽  
Yuanyuan Lyu ◽  
Dylan Marques ◽  
Edward Zhang ◽  
Paul Beard
Keyword(s):  
Thin Films ◽  
Optical Absorption ◽  
Absorption Coefficient ◽  
Near Infrared ◽  
Optical Absorption Coefficient ◽  
Parylene C

Quantitative photopyroelectric out-of-phase spectroscopy of amorphous silicon thin films deposited on crystalline silicon

1991 ◽  
Vol 69 (3-4) ◽  
pp. 317-323 ◽  
Author(s):  
Constantinos Christofides ◽  
Andreas Mandelis ◽  
Albert Engel ◽  
Michel Bisson ◽  
Gord Harling
Keyword(s):  
Thin Films ◽  
Optical Absorption ◽  
Absorption Coefficient ◽  
Dynamic Range ◽  
Crystalline Silicon ◽  
Optical Absorption Coefficient ◽  
Si Substrates ◽  
Silicon Thin Films ◽  
Background Compensation

A photopyroelectric spectrometer with real-time and(or) self-normalization capability was used for both conventional transmission and thermal-wave spectroscopic measurements of amorphous Si thin films, deposited on crystalline Si substrates. Optical-absorption-coefficient spectra were obtained from these measurements and the superior dynamic range of the out-of-phase (quadrature) photopyroelectric signal was established as the preferred measurement method, owing to its zero-background compensation capability. An extension of a photopyroelectric theoretical model was established and successfully tested in the determination of the optical absorption coefficient and the thermal diffusivity of the sample under investigation. Instrumental sensitivity limits of βt ≈ 5 × 10−3 were demonstrated.

Interference-Free Determination of the Optical Absorption Coefficient and the Optical Gap of Amorphous Silicon Thin Films

1991 ◽  
Vol 30 (Part 1, No. 5) ◽  
pp. 1008-1014 ◽  
Author(s):  
Yoshihiro Hishikawa ◽  
Noboru Nakamura ◽  
Shinya Tsuda ◽  
Shoichi Nakano ◽  
Yasuo Kishi ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Absorption ◽  
Absorption Coefficient ◽  
Amorphous Silicon ◽  
Optical Absorption Coefficient ◽  
Optical Gap ◽  
Silicon Thin Films

OPTICAL CHARACTERISATION OF THERMALLY EVAPORATED NICKEL PHTHALOCYANINE THIN FILMS

2004 ◽  
Vol 18 (03) ◽  
pp. 421-434 ◽  
Author(s):  
M. M. EL-NAHASS ◽  
K. F. ABD-EL-RAHMAN ◽  
A. A. M. FARAG ◽  
A. A. A. DARWISH
Keyword(s):  
Thin Films ◽  
Optical Absorption ◽  
Absorption Coefficient ◽  
Dielectric Constants ◽  
Optical Absorption Coefficient ◽  
Published Data ◽  
Dipole Strength ◽  
Dispersion Parameters ◽  
Absorption Bands ◽  
Nickel Phthalocyanine

Optical properties of thermally evaporated nickel phthalocyanine thin films have been characterised using spectrophotometric measurements of transmittance and reflectance in spectral range 200–2100 nm. The refractive index n and the absorption index k were calculated. Some of the optical absorption parameters, namely optical absorption coefficient (α), molar extinction coefficient (ε molar ), oscillator strength (f), electric dipole strength (q2) and absorption half bandwidth (Δλ) of the principal optical transitions have been also evaluated. The analysis of the spectral behaviour of the absorption coefficient (α), in the absorption region revealed indirect transitions. The fundamental and the onset energy gaps were estimated as 2.77±0.02 eV and 1.58±0.01 eV, respectively. According to the analysis of dispersion curves, the dielectric constants and dispersion parameters were obtained. The absorption measurements recorded in the UV–VIS region show two well defined absorption bands of phthalocyanine molecule, namely the Soret band (B) and the Q band. The Q band shows its characteristic splitting (Davydov splitting), and ΔQ was obtained as 0.21 eV. Discussion of the obtained results and their comparison with the previous published data are also given.

scholarly journals Optical and Recombination Parameters of CdS1−xTex Thin Films Obtained by the CMBD Method

Coatings ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 5
Author(s):  
Takhir M. Razykov ◽  
Aleksy Patryn ◽  
Mirosław Maliński ◽  
Leszek Bychto ◽  
Bobur Ergashev ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Absorption ◽  
Absorption Coefficient ◽  
Glass Substrate ◽  
Molecular Beam ◽  
Optical Absorption Coefficient ◽  
Surface Photovoltage ◽  
Energy Gaps ◽  
Molecular Beam Deposition ◽  
Beam Deposition

This paper presents the results of the photoacoustic, SEM, and surface photovoltage experiments performed on the series of CdS1−xTex thin films. These CdS1−xTex (0 ≤ x ≤ 1) thin films were obtained on the glass substrate by the chemical molecular beam deposition (CMBD) method. The polycrystalline character of these films was revealed by SEM pictures. From the experimental optical characteristics, the optical absorption coefficient spectra of the samples and values of their energy gaps vs. their composition were determined. From the surface photovoltage characteristics, the diffusion lengths of the carriers were also determined.

scholarly journals Optical Absorption Coefficient of a Dispersion of Clusters Composed of a Large Number of Spheres

1987 ◽  
Vol 6 (2) ◽  
pp. 173-181 ◽  
Author(s):  
F. Borghese ◽  
P. Denti ◽  
R. Saija ◽  
G. Toscano ◽  
O. I. Sindoni
Keyword(s):  
Optical Absorption ◽  
Absorption Coefficient ◽  
Optical Absorption Coefficient

Reversible Changes in the Electronic and Optical Properties of Micro-Crystalline ln2O 3-x: A Comparison with Amorphous In2O3-x

1996 ◽  
Vol 426 ◽  
Author(s):  
B. Pashmakov ◽  
H. Fritzsche ◽  
B. Claflin
Keyword(s):  
Optical Properties ◽  
Optical Absorption ◽  
Absorption Coefficient ◽  
Ultraviolet Light ◽  
Indium Oxide ◽  
Electrical Conductance ◽  
Inert Gas ◽  
Optical Absorption Coefficient ◽  
Electronic And Optical Properties

AbstractThe electrical conductance and optical absorption coefficient of microcrystalline indium oxide (c – In2 O 3-x ) can be changed reversibly by several orders of magnitude by photoreduction and reoxidation. Photoreduction is achieved by exposure to ultraviolet light hv ≥ 3.5eV in vacuum or an inert gas. The effects are similar to those previously observed in amorphous In2 O3-x

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