Rod-shaped Zn–Ag–In–Te nanocrystals with wavelength-tunable band-edge photoluminescence in the near-IR region

Abstract

The bandedge PL peak wavelength of ZnTe–AgInTe2 solid solution nanocrystals was tunable in the near-IR region by changing their chemical composition.

Enhanced Photoelectrochemical Properties of Zn−Ag−In−Te Nanocrystals with High Energy Photon Excitation

“…Figure shows absorption spectra of ZAITe( x ) NCs with different x values. A exciton peak was observed for NCs with each x value, the peak energy being increased with a decrease in the x value, as we previously reported . The E g values determined from the absorption onset were 1.20, 1.27, and 1.46 eV for x =1.0, 0.75, and 0.5, respectively.…”

“…A exciton peak was observed for NCs with each x value, the peak energy being increased with a decrease in the x value, as we previously reported. [41] The E g values determined from the absorption onset were 1.20, 1.27, and 1.46 eV for x = 1.0, 0.75, and 0.5, respectively. TEM measurements revealed that the prepared ZAITe NCs had a rod-like shape (inset of Figure 1), and the average rod width and average rod length were almost constant, regardless of the x value used for the preparation, ca.…”

“…ZnTeÀ AgInTe 2 solid solution (ZAITe; (AgIn) x Zn 2(1-x) Te 2 ) NCs were prepared by the reaction of corresponding metal acetates with trioctylphosphine telluride at 250°C in dodecanethiol under an N 2 atmosphere according to our previous procedure. [41] The purified ZAITe NCs were dissolved in octane for measurements. The chemical composition of ZAITe NCs was varied by changing the ratio of metal precursors, Ag : In : Zn = x : x : 2(1-x).…”

“…successfully prepared Zn−Cu−In−Se solid solution NCs having an absorption onset of 860∼1060 nm and then demonstrated that sensitized solar cells composed of mesoporous TiO 2 films modified with Zn−Cu−In−Se NCs exhibited solar energy conversion efficiency of 11.6% . We prepared ZnTe−AgInTe 2 solid solution (ZAITe; (AgIn) x Zn 2(1‐x) Te 2 ) NCs with a rod shape, the E g of which was enlarged from 1.20 to 1.60 eV with an increase in Zn content . ZAITe NCs exhibited a narrow band‐edge PL peak with high QYs, and the PL peak wavelength was tunable in the near‐IR wavelength region depending on their E g .…”

“…[39] We prepared ZnTeÀ AgInTe 2 solid solution (ZAITe; (AgIn) x Zn 2(1-x) Te 2 ) NCs with a rod shape, the E g of which was enlarged from 1.20 to 1.60 eV with an increase in Zn content. [40,41] ZAITe NCs exhibited a narrow band-edge PL peak with high QYs, and the PL peak wavelength was tunable in the near-IR wavelength region depending on their E g . These NCs are expected to act as a photosensitizer for near-IR light, but their photoelectrochemical and photocatalytic properties have not been investigated.…”