Summary
The absorption spectrum near the fundamental absorption edge of an-type CuInSe2 single crystal grown by the Bridgman method has been studied at 100 and 300 K. An absorption edge corresponding to the direct-band-gap transition is observed at about 1 eV. An additional absorption is observed at lower energies ((0.93÷0.95) eV) and is attributed to direct transitions assisted by long-wave-length optical phonons.
Riassunto
Lo spettro di assorbimento vicino al bordo di assorbimento fondamentale di un cristallo singolo di tipon di CuInSe2, cresciuto col metodo di Bridgman, è stato studiato a 100 e 300 K. Si osserva un bordo di assorbimento in corrispondenza della transizione del gap di banda diretta a circa 1 eV. Un ulteriore assorbimento è osservato a energie inferiori ((0.93÷0.95) eV) ed è attribuito a transizioni dirette alla presenza di fononi ottici a grande lunghezza d'onda.
Резюме
При 100 К и 300 К исследуется спектр поглощения вблизи основного края поглощения монокристалла CuInSe2 n-типа, выращенного по методу Ъридгмана, Вблизи 1 эВ обнаружен край поглощения, соответствующий прямому переходу. Дополнительное поглощение наблюдается при меньших энергиях ((0.93÷0.95) эВ) и приписывается прямым переходом, связанным с длинноволновыми оптическими фононами.
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Literatur
J. Parkes, R. D. Tomlimson andM. J. Hampshire:Solid-State Electron.,16, 773 (1973).
A. Poplavnoi andYu. I. Poligalov:Izv. Akad. Nauk SSSR, Neorg. Mater,7, 1711 (1971);Inorg. Mater. (USRR),7 1527 (1971).
J. González, C. Rincón, A. Redondo andP. Negrete:Jpn. J. Appl. Phys.,19, Suppl. 3, 29 (1980).
C. Rincón, J. González andG. Sánchez Pérez:Phys. Status Solidi B,108, K19 (1981).
J. I. Pankove:Optical Processes in Semiconductors (New York, N. Y., 1975), p. 37.
J. Gan, J. Tauc, V. Lambrecht andM. Robbins:Phys. Rev. B,13, 3610 (1976).
V. Riede, H. Sobotta, H. Neumann, Hoang Xuan Nguyen, W. Möller andG. Kühn:Solid State Commun.,28, 449 (1978).
H. Sobotta, H. Neumann, W. Kissinger, G. Kühn andV. Riede:Phys. Status Solidi B,103, K125 (1981).
C. Rincón andJ. González:Phys. Status Solidi B,110, K171 (1982).
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Rincón, C., González, J., Pérez, G.S. et al. Direct phonon-assisted transitions near the fundamental absorption edge in CuInSe2 . Il Nuovo Cimento D 2, 1895–1899 (1983). https://doi.org/10.1007/BF02457883
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DOI: https://doi.org/10.1007/BF02457883