Super deformability and thermoelectricity of bulk γ-InSe single crystals

Indium selenide, a III–V group semiconductor with layered structure, attracts intense attention in various photoelectric applications, due to its outstanding properties. Here, we report super deformability and thermoelectricity of γ-In Se single crystals grown by modified Bridgeman method. The crystal structure of In Se is studied systematically by transmission electron microscopy methods combined with x-ray diffraction and Raman spectroscopy. The predominate phase of γ-In Se with dense stacking faults and local multiphases is directly demonstrated at atomic scale. The bulk γ-In Se crystals demonstrate surprisingly high intrinsic super deformative ability which is highly pliable with bending strains exceeding12.5% and 264% extension by rolling. At the meantime, In Se also possesses graphite-like features which is printable,writable, and erasable. Finally, the thermoelectric properties of γ-In Se bulk single crystals are preliminary studied and thermal conductivity can be further reduced via bending-induced defects. These findings will enrich the knowledge of structural and mechanical properties' flexibility of In Se and shed lights on the intrinsic and unique mechanical properties of In Se polytypes.

Super deformability and thermoelectricity of bulk γ-InSe single crystals

Indium selenide, a Ⅲ-V group semiconductor with layered structure, attracts intense attention in various photoelectric applications, due to its outstanding properties. Here, we report super deformability and thermoelectricity of γ-InSe single crystals grown by modified Bridgeman method. The crystal structure of InSe is studied systematically by transmission electron microscopy methods combined with x-ray diffraction and Raman spectroscopy. The predominate phase of γ-InSe with dense stacking faults and local multiphases is directly demonstrated at atomic scale. The bulk γ-InSe crystals demonstrate surprisingly high intrinsic super deformative ability which is highly pliable with bending strains exceeding 12.5% and 264% extension by rolling. At the meantime, InSe also possesses graphite-like features which is printable, writable, and erasable. Finally, the thermoelectric properties of γ-InSe bulk single crystals are preliminary studied and thermal conductivity can be further reduced via bending-induced defects. These findings will enrich the knowledge of structural and mechanical properties' flexibility of InSe and shed lights on the intrinsic and unique mechanical properties of InSe polytypes.