We synthesized thermoelectric nanocomposites by mixing HgSe nanoparticles （NPs） and Ag NPs in a solution and investigated the thermoelectric properties of the nanocomposite thin films on flexible plastic substrates....We synthesized thermoelectric nanocomposites by mixing HgSe nanoparticles （NPs） and Ag NPs in a solution and investigated the thermoelectric properties of the nanocomposite thin films on flexible plastic substrates. The X-ray diffraction patterns and the X-ray photoelectron spectra of the nanocomposites demonstrate that cation-exchange reactions occurred spontaneously in the mixed solution of HgSe and Ag NPs and that the HgSe NPs were completely converted to Ag2Se when the Ag NP content was 20 vol.%. The maximum power factor and the thermoelectric figure of merit were obtained as 75 pW/mK2 and 0.043 at 300 K, respectively, when the Ag NP content was 10 vol.%, which is 100 times higher than that of HgSe NP thin films. In addition, the mechanical stability of the thermoelectric nanocomposite film was confirmed through repeated bending tests.展开更多
Mercuryselenide is a zero-gap semiconductor of Ⅱ- Ⅵ-family. The iron-doped modification HgSe:Fe has a "Fermi-level pinning" beyond the electron concentration of 5 × 1018 cm-3. Due to the short-range c...Mercuryselenide is a zero-gap semiconductor of Ⅱ- Ⅵ-family. The iron-doped modification HgSe:Fe has a "Fermi-level pinning" beyond the electron concentration of 5 × 1018 cm-3. Due to the short-range correlation of Fe + +/Fe + + +system, a dramatic increase of carrier mobility is observed, so that any quantum effect in 3D, 2D, 1D, and 0D is well detected. Applying molecular-beam epitaxy for the sample preparation, we present magnetospectral data of selected samples of this compound demonstrating various features in magnetic fields up to 1000 T by applying different field generators. The resulting data are explained in connection with suitable theoretical concepts basing on the k * p-method as well as on the tightbinding approximation.展开更多
文摘We synthesized thermoelectric nanocomposites by mixing HgSe nanoparticles （NPs） and Ag NPs in a solution and investigated the thermoelectric properties of the nanocomposite thin films on flexible plastic substrates. The X-ray diffraction patterns and the X-ray photoelectron spectra of the nanocomposites demonstrate that cation-exchange reactions occurred spontaneously in the mixed solution of HgSe and Ag NPs and that the HgSe NPs were completely converted to Ag2Se when the Ag NP content was 20 vol.%. The maximum power factor and the thermoelectric figure of merit were obtained as 75 pW/mK2 and 0.043 at 300 K, respectively, when the Ag NP content was 10 vol.%, which is 100 times higher than that of HgSe NP thin films. In addition, the mechanical stability of the thermoelectric nanocomposite film was confirmed through repeated bending tests.
文摘Mercuryselenide is a zero-gap semiconductor of Ⅱ- Ⅵ-family. The iron-doped modification HgSe:Fe has a "Fermi-level pinning" beyond the electron concentration of 5 × 1018 cm-3. Due to the short-range correlation of Fe + +/Fe + + +system, a dramatic increase of carrier mobility is observed, so that any quantum effect in 3D, 2D, 1D, and 0D is well detected. Applying molecular-beam epitaxy for the sample preparation, we present magnetospectral data of selected samples of this compound demonstrating various features in magnetic fields up to 1000 T by applying different field generators. The resulting data are explained in connection with suitable theoretical concepts basing on the k * p-method as well as on the tightbinding approximation.
