Thermal phase transformation of In2Se3 nanowires studied by in situ synchrotron radiation X-ray diffraction

Abstract

We report the preparation of aand k-phase In 2 Se 3 nanowires by thermal evaporation and investigation of their phase transformations in situ by synchrotron radiation X-ray diffraction (XRD) during a thermal annealing process. The k-phase transformed into the a-phase at 500 C and eventually transformed to high temperature a-phase with a layered structure of 5 atoms-5 atoms at 700 C irreversibly. Different atomistic structures of In 2 Se 3 were modeled and optimized by DFT, which correlate well with the XRD results. The In 2 Se 3 nanowires also exhibit a large difference in resistivity before and after annealing.

Optical-memory switching and oxygen detection based on the CVT grown γ- and α-phase In2Se3

“…Diindium triselenide (In 2 Se 3 ) is a III-VI compound which possesses at least five crystal modifications: ␣ (two-layer hexagonal, 2H), ␤ (three-layer rhombohedral, 3R), ␥ (defect wurtzite in hexagonal, H), ␦, and [1,2]. The ␦ and are meta stable phases of diindium triselenide formed at different high temperatures.…”

Controlling Growth High Uniformity Indium Selenide (In2Se3) Nanowires via the Rapid Thermal Annealing Process at Low Temperature

“…Indium selenide (In 2 Se 3 ) is a black crystalline and very interesting compound semiconductor of the A III B VI group with layered structure, which possessed at least five crystal modifications of α (two-layer hexagonal, 2H), β (threelayer rhombohedral, 3R), γ (defect wurtzite in hexagonal, H), δ, and κ [5,6]. Due to its polymorphism and the related metal-ion defect structure, In 2 Se 3 has attracted substantial attention as a promising semiconductor material for several different applications such as photovoltaic solar cell [7,8], optoelectronics [9], and ionic battery [10].…”

Multi-morphological growth of nano-structured In2Se3 by ambient pressure triethylene glycol based solution syntheses

“…The generally known indium selenides are In 2 Se 3 , InSe and In 6 Se 7 [21]. In 2 Se 3 , as a stable electron structure compound, has at least five crystal modifications of α, β, γ, κ and δ, in which polymorphic phases α, β and γ have been confirmed [22,23]. Thermodynamically, α-In 2 Se 3 can be formed as both α(3R) and α(2H) crystal structures with bandgap energy of 1.36eV at below 200°C.…”