Polymorphism of GeSbTe Superlattice Nanowires

Title
Polymorphism of GeSbTe Superlattice Nanowires
Authors
Chan Su Jung김한성Hyung Soon ImYoung Seok SeoKidong ParkSeung Hyuk BackYong Jae ChoChang Hyun KimJeunghee Park안재평
Keywords
nanowires; polymorphism; superlattices; phase change; transition; GeSbTe; cubic?rhombohedral transition
Issue Date
2013-02
Publisher
Nano letters
Citation
VOL 13, NO 2, 543-549
Abstract
Scaling-down of phase change materials to a nanowire (NW) geometry is critical to a fast switching speed of nonvolatile memory devices. Herein, we report novel composition-phase-tuned GeSbTe NWs, synthesized by a chemical vapor transport method, which guarantees promising applications in the field of nanoscale electric devices. As the Sb content increased, they showed a distinctive rhombohedral−cubic−rhombohedral phase evolution. Remarkable superlattice structures were identified for the Ge8Sb2Te11, Ge3Sb2Te6, Ge3Sb8Te6, and Ge2Sb7Te4 NWs. The coexisting cubic−rhombohedral phase Ge3Sb2Te6 NWs exhibited an exclusively uniform superlattice structure consisting of 2.2 nm period slabs. The rhombohedral phase Ge3Sb8Te6 and Ge2Sb7Te4 NWs adopted an innovative structure; 3Sb2 layers intercalated the Ge3Sb2Te6 and Ge2Sb1Te4 domains, respectively, producing 3.4 and 2.7 nm period slabs. The current−voltage measurement of the individual NW revealed that the vacancy layers of Ge8Sb2Te11 and Ge3Sb2Te6 decreased the electrical conductivity.
URI
http://pubs.kist.re.kr/handle/201004/44641
ISSN
15306984
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KIST Publication > Article
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