Infrared and Raman study of lattice vibrations of CuAlSe2 single crystals

Optical, thermal, electrical, damage, and phase-matching properties of lithium selenoindate

“…As expected from reduced mass considerations the optical mode frequencies of LISe are shifted to lower frequencies in comparison to LIS [12] due to the substitution of sulphur by selenium. The dominant line of the total symmetrical A 1 mode lies at 268 cm -1 for LIS and at 161.5 cm -1 for LISe [57]. The ratio of 1.66 of the frequencies of these lines corresponds to the square root (1.57) of the ratio of the atomic masses of selenium and sulphur.…”

“…Infrared reflectivity and Raman spectra with polarized light were recorded for yellow phase LISe at room and low temperature in [17,50,57]. With the complementary information from IR and Raman spectroscopy, the observed 33 IR active and the 12 exclusively Raman active modes could be assigned to their corresponding symmetry classes, tabulations can be found in [17,57]. No difference was observed between the red and yellow phases [17].…”

“…The room temperature results in the 0.525-12 µm spectral range are included in Table III. Then, imposing that the IR poles match the In-Se phonon wavelengths [57], a starting (raw) set of Sellmeier equations was derived. The further refinement was based on narrow band CW difference-frequency generation (DFG) phase-matching data in the 5.9-8.1 µm range (a LISe sample of greenish colour cut at ϕ=55° in the X-Y plane was used for these measurements, see Section 9 A), the signal wavelength (1537 nm) obtained at normal incidence in the optical parametric oscillator (OPO) experiment with 1064 nm pumping (ϕ=72° crystal cut in the X-Y plane with a yellow color sample) [69], a SHG value of ϕ=70.39° in the X-Y plane measured at 2.845 µm with fs pulses and yellow LISe [29] and SHG angles measured in the X-Z plane (θ=17.62° at 2.23 µm, with fs pulses and yellow LISe [29] and θ=30° measured at 9.55 µm with ns pulses and red LISe [52]).…”

Adiabatic bond charge model for lattice dynamics of ternary chalcopyrite semiconductors

“…[3] are Raman [4][5][6][7][8][9][10][11][12], Infrared [13][14][15][16] and neutron scattering [17,18] results). Theoretical studies of same properties can be divided into two main groups: phenomenological models and ab initio calculations.…”

Optical Properties of Copper Aluminium Diselenide Thin Films under the Influence of Ammonium Solution as pH Adjuster

“…Some studies of Cu(In,Al)Se2 (CIAS), CuGaSe2 (CGS) and Cu(In,Ga)Se2 (CIGS) thin films on transparent coated oxide (TCO) substrates obtained great results with efficiencies around 15% [4][5][6][7]. Several methods of deposition of CuAlSe2 thin films [8][9][10][11][12][13][14][15][16][17][18][19][20][21]. CBD method is preferred for its simplicity, inexpensive and capability to achieve large surface area coatings [16].…”