Optical properties of the alkali antimonide semiconductors , , and

Pressure effect on the electronic and optical properties of the alkali antimonide semiconductors Cs3Sb, KCs2Sb, CsK2Sb and K3Sb: Ab initio study

“…The obtained curves were reported elsewhere [32]. Here, we just display the obtained results in Table 1 together with the available experimental data and results of other calculations.…”

“…4) and also to the change of the origins of the peaks in k space. In fact, for the latter point the main peak in the optical spectrum at zero pressure is due the transition v 1 -c 2 in the S line in the Brillouin zone [32], but at p ¼9.54 GPa it results mainly from the v 3 -c 1 one around the X point as shown in Figs. 6-9, where the decomposition of the imaginary part of the dielectric function into band to band contributions and the transition energy band structures at finite pressure for K 3 Sb, K 2 CsSb, KCs 2 Sb and Cs 3 Sb are given.…”

“…The calculation and discussion of the optical properties of the studied compounds at zero pressure were reported elsewhere [32] in which the structure of the peaks were assigned to interband transitions and band structure energy differences. This analysis has been done by decomposing the imaginary part of the dielectric function to its pair contributions and plotting the transition band structure.…”

“…Since the early days, these materials have been the subject of extensive investigations experimentally and theoretically [26][27][28][29][30][31][32]. These studies were based on the determination and understanding of the electronic properties such as the band gaps and the optical ones such as the absorption coefficients from which the key parameters for their applications can be extracted.…”

Synthesis and x-ray characterization of sputtered bi-alkali antimonide photocathodes

“…The investigation of the electronic structures and the optical properties of these two materials shows that compared to K 2 CsSb, KCs 2 Sb has a smaller bandgap but a higher absorption of green light (530 nm). 17 Such properties of KCs 2 Sb might result in a similar green QE and a lower quantum yield in the UV compared to K 2 CsSb photocathodes. A commercial K 2 CsSb cathode from Photonis, Inc., was measured in the same geometry and the spectral response (dark curve in Fig.…”