Compositionally Tunable Photoluminescence Emission in Cu₂ZnSn(S_1−xSe_x)₄ Nanocrystals

Abstract

Inorganic nanostructures: Alloyed Cu2ZnSn(S1−xSex)4 wurtzite nanocrystals (10 nm in size) with a varying composition (x=0–1) were synthesized using a colloidal hot injection route. A photoluminescence (PL) emission study of these nanocrystals shows a compositionally tunable band‐gap ranging between 0.9–1.4 eV that directly correlates to the sulfur‐to‐selenium ratio (see picture).

Colloidal Cu2Zn(Sn1−xGex)S4nanocrystals: electrical properties and comparison between their wurtzite and kesterite structures

“…3) show a regular change which corresponds to the XRD patterns. An intense peak at 332 cm À1 is observed for the CZTS NCs, which is consistent with some other reports, 15,16,20,24 whereas the Raman shi of CZGS at 354 cm À1 is red-shied compared to the bulk materials. 25,26 Crystalline transformation may be responsible for this phenomenon.…”

A comprehensive study on the mechanism behind formation and depletion of Cu2ZnSnS4 (CZTS) phases

“…In fully crystalline form CZTS is found to exist in cubic, tetragonal (kesterite or stannite) and even hexagonal structures. [7][8][9][10] In the cubic structure all metal atoms Cu, Zn and Sn take random positions in the unit cell (called face centred cubic (FCC)-disordered CZTS in our paper). In the tetragonal structure, Sn atoms take a fixed position while Cu and Zn atoms can still be ordered or disordered (called tetragonal CZTS in the succeeding part).…”

Multiwavelength excitation Raman scattering of Cu2ZnSn(SxSe1−x)4 (0 ≤ x ≤ 1) polycrystalline thin films: Vibrational properties of sulfoselenide solid solutions

“…Several groups have also confirmed the ability to tune the bandgap of CZTSSe solid solutions by control of stoichiometry which allows for more versatile tuning of optical properties. [2][3][4][5][6] Systematic variation of the sulfur/selenium ratio allows the bandgap to be tuned from 1.4 to 0.9 eV, which greatly extends potential application of CZTSSe alloys in thin film photovoltaic devices, where a defined and controllable bandgap is required. Theoretical calculations, based on first principles simulations, of the band structure and optical properties of CZTSSe compounds have revealed that the mixed-anion alloys are highly miscible.…”