Chalcogenide nanostructures for energy conversion

Abstract

In Metal chalcogenide hierarchical nanostructures as energy conversion devices were studied in this chapter. Cd-chalcogenide nanostructures were chosen as sample study due to their unique properties as energy converter. In the first step, different methods were introduced to grow this type of nanostructures. It was discussed three low cost-effective methods to grow the Cd-chalcogenide nanostructures such as thermal evaporation (chemical and physical vapor depositions), chemical bath deposition, and electrochemical methods. However, it was observed that samples were grown by a pulsed laser deposition method as a complex method. In addition, effects of growth conditions on morphology and optical properties of the nanostructures were investigated. In the second step, the fundamentals of solar energy conversion were described. Furthermore, quantum physics of semi- conductor solar cells was studied. Finally, the Cd-chalcogenide nanostructures were introduced as solar energy conversion and important factors that can affect the efficiency of this type of solar cells were introduced.

Structural, Elastic, Electronic, and Magnetic Properties of Nd‐Doped NaScGe Half‐Heusler Compound by Ab‐Initio Method

“…This description indicates that this behaviour is MFM in nature to suggest potential avenues for further improvements. [ 78–84 ] In Figure 4a and 4c, it is proved that E g widens significantly by using mBJ ‐GGA. Regarding the effect of U, polarization is calculated for QH Na 0.75 Nd 0.25 ScGe compound for values below 2 eV.…”

Investigation of semi-metallic properties of GdSb and TbSb compounds

“…Extremely large values of magnetoresistance associated with Fermi-surface topology were found in these materials at low temperatures [5]. For example, the magnetoresistance of GdSb, defined as (H)/ (0) 100%, is 12100% at 2K and H = 9T [6]. At T < TN the AFM ordering is accompanied by a magnetostrictive effecta trigonal distortion of the crystal structure, and the dependences of magnetization on the magnetic field revealed features associated with metamagnetic phase transitions.…”