Structure and thermoelectric properties of 2D Cr₂Se_3−3xS_3x solid solutions

Abstract

S substitution improves the ZT value of Cr2Se3−3xS3x which has a two-dimensional layered structure by 32%.

Structural and magnetic properties of molecular beam epitaxy grown chromium selenide thin films

“…Both hcp(0001) and fcc(111) surfaces have similar hexagonal Bravais lattice and they differ only in the registry of the third layer [51]. Compared to previous studies of bulk crystals grown via solid state reaction method [11,12], we notice diminished sizes of the structures in a thin film (~ 20-40 nm). Insets show the close-up shape of triangular structures.…”

“…Bulk crystal growth of Cr2Se3 has been achieved previously by various methods, e.g., ceramic method [6][7][8][9], solid state reaction method [10][11][12][13]16], soft chemical and hydrothermal synthesis [15,17,18] and chemical vapor transport method [4,14,[19][20][21]. Using MBE, here we have studied the growth of Cr2Se3 thin 111)-(7×7) substrates.…”

“…Previously, chromium selenide systems have been studied to investigate their suitability as thermoelectric material for intermediate-temperature applications [10][11][12][13][14], intermediate temperature power generation [13], electrochemical sensors [15], etc. Several groups have studied the structural, magnetic, electrical and thermoelectric properties of single crystal Cr2+xSe3-x compounds grown using solid state reaction method [10][11][12][13]16], soft chemical and hydrothermal synthesis [15,17,18] and chemical vapor transport method [4,14,[19][20][21]. However, the studies focus mostly on the improvement in thermoelectric properties of transition-metal-doped bulk samples of Cr2Se3.…”

Micrometer Sized Hexagonal Chromium Selenide Flakes for Cryogenic Temperature Sensors

“…This structure is composed of a hexagonal close packing of metalloids atoms with the transition metal atoms found at the interstices, in such a way to form a hexagonal array. This can be viewed as a fully occupied CrSe layer and a Cr-deficient CrSe layer being stacked on each other [8,9]. These structural features have been observed in materials with a low thermal conductivity, making them very good candidates for thermoelectric materials [10].…”

“…Chromium selenide systems are promising as electrochemical sensors [11], thermoelectrics for intermediate-temperature applications [9,12], and intermediate-power generation [13] but also for their 2D counterparts that exhibit distinct, thickness dependent ferromagnetic properties [14]. The last ones can find possible applications in spintronics too [15].…”