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Controllable Synthesis of Bandgap‐Tunable CuS x Se 1− x Nanoplate Alloys
Author(s) -
Xu Jun,
Yang Xia,
Yang QingDan,
Huang Xing,
Tang Yongbing,
Zhang Wenjun,
Lee ChunSing
Publication year - 2015
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201500156
Subject(s) - materials science , band gap , ternary operation , raman spectroscopy , selenide , polysulfide , semiconductor , hexagonal crystal system , crystallography , chemistry , optoelectronics , metallurgy , selenium , physics , electrode , electrolyte , optics , computer science , programming language
Composition engineering is an important approach for modulating the physical properties of alloyed semiconductors. In this work, ternary CuS x Se 1− x nanoplates over the entire composition range of 0≤ x ≤1 have been controllably synthesized by means of a simple aqueous solution method at low temperature (90 °C). Reaction of Cu 2+ cations with polysulfide/‐selenide ((S n Se m ) 2− ) anions rather than independent S n 2− and Se m 2− anions is responsible for the low‐temperature and rapid synthesis of CuS x Se 1− x alloys, and leads to higher S/Se ratios in the alloys than that in reactants owing to different dissociation energies of the Se−Se and the S−S bonds. The lattice parameters ‘ a ’ and ‘ c ’ of the hexagonal CuS x Se 1− x alloys decrease linearly, whereas the direct bandgaps increase quadratically along with the S content. Direct bandgaps of the alloys can be tuned over a wide range from 1.64 to 2.19 eV. Raman peaks of the S−Se stretching mode are observed, thus further confirming formation of the alloyed CuS x Se 1− x phase.