Stoichiometry of Thin Layers of CuInSe<sub>2</sub> Investigated by ESCA

Bulk CuInSe, at 1083 K has a reversible phase transition of first order from the ordered chalcopyrite to the disordered sphalerite structure ( MOLLER et al. 1985). In epitaxial layers deposited on (111)-oriented GaAs and Ge substrates by the flash evaporation technique (SCHUMANN et al. 1978a(SCHUMANN et al. , 1980a) the sphalerite phase was observed already a t lower substrate temperatures (Tab. 1). This sphalerite structure is stable a t room temperature in contrast t o the bulk material and can be detected by reflection high energy electron diffraction (RHEED) technique. On { 100)-and {llO}-oriented substrate no sphalerite structure was found (TEMPEL et al.). It should be noted that parts of the sphalerite phase in the CuInSe, epitaxial layers are not detectable by RHEED beside the chalcopyrite structure. Therefore, it is possible that the layers consist of the sphalerite phase partially even a t lower substrate temperatures as given in Table 1. SCHUMANN, KUHNThe reason for this phenomenon is unknown so far. l n this paper it is tried to give an interpretation for the occurrence of the sphalerite phase in epitaxial layers at relatively low growth temperatures.Combined thermogravimetric and mass spectroscopic investigations showed that CuInSe, evaporates in a two-stage process according t o 2 CuInSe, (s) + CuzSe (6) + In,Se (g) + Se, (g) (HONLE, KUHN). At lower temperatures (up t o about 1360K) the gaseous phase consists of In,Se arid Se,. Therefore, these both compounds should occur too a t the reevaporation from the growing layers. I n accordance with these considerations, at substrate temperatures Ts 2 770 K the epitaxial layers showed a Cu excess in comparison with the stoichiometric composition (HOBLER et el.; SOMMER et al.).

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CuInSe₂ epitaxial layers with sphalerite structure

Kühn

Schümann

1988

Cryst. Res. Technol.

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Stoichiometry of Thin Layers of CuInSe₂ Investigated by ESCA

Cited by 1 publication

References 8 publications

CuInSe₂ epitaxial layers with sphalerite structure

CuInSe₂ epitaxial layers with sphalerite structure

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Stoichiometry of Thin Layers of CuInSe2 Investigated by ESCA

Cited by 1 publication

References 8 publications

CuInSe2 epitaxial layers with sphalerite structure

CuInSe2 epitaxial layers with sphalerite structure

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Resources

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Stoichiometry of Thin Layers of CuInSe₂ Investigated by ESCA

CuInSe₂ epitaxial layers with sphalerite structure

CuInSe₂ epitaxial layers with sphalerite structure