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Diluted ZnMnTe oxide: a multi‐band semiconductor for high efficiency solar cells
Author(s) -
Yu K. M.,
Walukiewicz W.,
Wu J.,
Shan W.,
Scarpulla M. A.,
Dubon O. D.,
Beeman J. W.,
Becla P.
Publication year - 2004
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200304167
Subject(s) - ternary operation , semiconductor , oxygen , materials science , oxide , conduction band , thermal conduction , analytical chemistry (journal) , semimetal , optoelectronics , condensed matter physics , chemistry , band gap , electron , physics , metallurgy , organic chemistry , chromatography , quantum mechanics , computer science , composite material , programming language
Using oxygen ion implantation and pulsed laser melting, we have synthesized thin films of highly mismatched ternary ( y = 0) and quaternary ( y = 0.12) Zn 1− y Mn y O x Te 1− x alloys with oxygen content in excess of x ∼ 0.01. We show that incorporation of a small amount of isoelectronic oxygen leads to the formation of a narrow, oxygen‐derived band of extended states located well below the conduction band edge of the Zn 1− y Mn y Te matrix. The structure of the conduction band is well described by the anticrossing interaction between O localized states and the extended states of the host semiconductor matrix. As a result the conduction band splits into two subbands with distinctly non‐parabolic dispersion relations. The three absorption edges of this material (∼0.73, 1.83 and 2.56 eV) cover the entire solar spectrum providing a material envisioned for the multi‐band, single junction, high efficiency photovoltaic devices. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)