Controllable Synthesis of Bandgap‐Tunable CuSxSe1x Nanoplate Alloys

来自 Wiley

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摘要：

Composition engineering is an important approach for modulating the physical properties of alloyed semiconductors. In this work, ternary CuS x Se1 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 Cu2+ 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 Se1 x alloys, and leads to higher S/Se ratios in the alloys than that in reactants owing to different dissociation energies of the SeSe and the SS bonds. The lattice parameters ' a ' and ' c ' of the hexagonal CuS x Se1 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 2.19eV. Raman peaks of the SSe stretching mode are observed, thus further confirming formation of the alloyed CuS x Se1 x phase.

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关键词：

chalcogens copper nanostructures selenium sulfur

DOI：

10.1002/asia.201500156

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年份：

2015