Three Transition Regions Observed in Single Crystalline Bi-Rich Bi2Te3 Nanobelts

Abstract

Bi2Te3 has recently received considerable attention because of its various characteristics and applications potential. The effort to incorporate dopants into Bi2Te3 to achieve particular features has continued. We investigated Bi-rich Bi2Te3 nanobelts, which were synthesized by the VLS method. We confirmed that single crystalline Bi-rich Bi2Te3 nanobelts with 1:1 of Bi:Te atomic ratio had a hexagonal Bi2Te3 crystal structural phase, using X-ray diffraction and scanning transmission electron microscopy. The results from electrical and magneto-transport measurements of a Bi-rich Bi2Te3 nanodevice revealed three different transition regions, in which different magnetoresistance behaviors were observed, and where the maximum magnetoresistanee ratio was about 105%. These characteristics could provide a wider perspective for potential of Bi-rich Bi2Te3 nanodevices.