Berlin 2024 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 25: Oxide Semiconductors I
HL 25.7: Vortrag
Mittwoch, 20. März 2024, 11:30–11:45, ER 325
Nonlinear bond length change in zincblende Cu(Br,I) alloys — •Sandra Montag1, Stefan Merker2, Michael Bar1, Richard J. Schenk1, Eva Zollner1, Konrad Ritter1, Timo Pfeiffelmann1, Sergiu Levcenko1, Edmund Welter3, Holger von Wenckstern1, Marius Grundmann1, Harald Krautscheid2, and Claudia S. Schnohr1 — 1Felix Bloch Institute for Solid State Physics, Leipzig University, Germany — 2Institute of Inorganic Chemistry, Leipzig University, Germany — 3Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
CuI is one of the most promising transparent p-type semiconductors with various applications from diodes to solar cells, including also flexible electronics [1]. Among numerous doping and alloying attempts, anion substitution with bromide can be used to tailor the free hole concentration in functional layers enabling optimized performance of active devices such as pn-diodes or transistors [2]. Using X-ray absorption spectroscopy, the element-specific fine structure of CuBr1−xIx powder and thin film samples with anion composition x varying from 0 to 1 was measured. The near edge region is used to identify the presence and amount of oxygen contamination of the samples. The analysis of the extended fine structure reveals a nonlinear change of the Cu-Br and Cu-I bond lengths with composition x. This behaviour is different from that observed for III-V and II-VI zincblende alloys [3].
[1] Grundmann et al., Phys. Status Solidi A 210, No. 9, 1671 (2013) [2] Yamada et al., Adv. Funct. Mater. 30, 2003096 (2020)
[3] Schnohr, Appl. Phys. Rev. 2, 031304 (2015)
Keywords: transparent semiconductors; copper iodide; zincblende alloys; x-ray absorption spectroscopy; bond lengths