Calculation of the Density of the Distribution of Electronic States in the Conduction Band from the Fundamental Absorption Spectra of Amorphous Semiconductors
Abstract
The region of fundamental absorption in the optical spectra of amorphous semiconductors is theoretically studied using the Davis-Mott approximation according to the Kubo-Greenwood formula. As is known, three types of optical transitions of the electron can be observed in the fundamental absorption region; from the tail of the valence band to the conduction band, from the valence band to the conduction band and from the valence band to the tail of the conduction band. For all these electronic transitions, analytical expressions of the partial absorption spectra are obtained from two different types of the Kubo-Greenwood formula. The width of the optical mobility gap and the proportionality coefficient were determined in the analytical form of the interband absorption spectrum by fitting them to the experimental interband absorption spectrum. A new method is presented for calculating the density of distribution of electronic states in the conduction band of amorphous carbon based on the experimental interband absorption spectrum and the analytical expression of the Kubo-Greenwood formula written for the interband absorption spectrum.
Downloads
References
S. Zainobidinov, R.G. Ikramov, M.A. Nuritdinova, and R.M. Zhalalov, “Dependence of the Urbach energy on the Fermi level in a-Si:H films,” Ukr. J. Phys. 53(12), 1177-1180 (2008). http://archive.ujp.bitp.kiev.ua/files/journals/53/12/531207p.pdf
Z. Li, S.H. Lin, G.M. Qiu, J.Y. Wang, and Y.P. Yu, “A method for determining band parameters from the optical absorption edge of amorphous semiconductor: Application to a-Si:H,” Journal of applied physics 124, 025702 (2018). https://doi.org/10.1063/1.5025920
R.G. Ikramov, M.A. Nuriddinova, and Kh.A. Muminov, “Calculation of the density of electronic states in the valence band from the experimental spectrum of interband absorption of amorphous semiconductors,” Journal of Applied Spectroscopy, 88(3), 378 382 (2021). https://doi.org/10.1007/s10812-021-01200-9
R.G. Ikramov, A.A. Mamaxanov, M.A. Nuriddinova, R.M. Jalolov, Kh.M. Muminov, and B.Q. Sultonov, “Calculation of the interband absorption spectra of amorphous semiconductors using the Kubo-Greenwood formula,” Journal of Applied Science and Engineering, 25(5), 767-772 (2022). https://doi.org/10.6180/jase.202210
R.G. Ikramov, M.A. Nuriddinova, and Kh.A. Muminov, “A new method for determining the distribution of the density of electronic states in the tail of the valence band of amorphous solid solutions SexS1–x,” Optics and spectroscopy, 129(11), 1382 1386 (2021). https://doi.org/10.21883/OS.2021.1151636.1949-21
M. Brodsky, editor, Amorphous semiconductors, (Mir, Moscow, 1982)
D. Redfield, “Energy-band tails and the optical absorption edge; the case of a-Si:H,” Solid State Communications, 44, 1347 1349 (2014). https://doi.org/10.1016/0038-1098(82)90890-0
S. Zainobinov, R.G. Ikpamov, R.M. Zhalalov, and M.A.Nuritdinova, “Distribution of electron density of states in allowed bands and interband absorption in amorphous semiconductors,” Optics and Spectroscopy, 110(5). 762-766 (2011). https://doi.org/10.1134/S0030400X11030271
A.A. Pronkin, and A.V. Konstantinovsky, “Absorption and optical gap width of α-C films obtained by magnetron sputtering,” High Temp. 53(2), 312-314 (2015). https://doi.org/10.1134/S0018151X15020212
N. Bronshtein, and K.A. Semendyaev, Handbook of Mathematics for Engineers and Technical University Students, (Moscow, 1986). (in Russian)
Copyright (c) 2023 Рустамжон Г. Ікрамов, Хуршидбек А. Мумінов, Машхура А. Нурітдінова, Бобур Q. Сутонов, Ойбек T. Холмірзаєв
This work is licensed under a Creative Commons Attribution 4.0 International License.
Authors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgment of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgment of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
