Thermoelectric properties of BiOCu_1−xM_xSe (M = Cd and Zn)

Abstract

Doping of BiOCuSe at the copper site with divalent cadmium and zinc cations has been investigated. Analysis of the powder X-ray diffraction data indicates that the ZrCuSiAs structure of BiOCuSe is retained up to substitution levels of 10 and 5 at.% for Cd 2+ and Zn 2+ , respectively. Substitution of monovalent Cu + with divalent Cd 2+ or Zn 2+ leads to an increase in the magnitude of the electrical resistivity and the Seebeck coefficient. All synthesized materials behave as p-type semiconductors.

Highly enhanced thermoelectric performance in BiCuSeO ceramics realized by Pb doping and introducing Cu deficiencies

“…Two factors may contribute to this result. Firstly, the Cu deficiencies can be serve as scattering centers to reduce the κ L by increasing the magnitude and frequency of the scattering event for heat‐carrying phonons . The other is the growth grain size for PBCSO samples (Figure B‐E) may increase the phonon mean free path and lead to the subtle increase of κ L .…”

“…17,18 Moreover, pristine BiCuSeO exhibits an intrinsically low lattice thermal conductivity ~0.40 Wm/K at 923 K, which leads to a ZT value of 0.5 at the same temperature. 19 The ZT values had been improved by doping on Bi sites with alkali/alkali-earth or transition-metal elements, 18,[20][21][22][23] introducing Bi or Cu vacancies, 19,24,25 modulation doping, 26 dual-doping approach et al 27,28 As a result, the maximum ZT has been promoted up to 1.5 at 873 K for Bi 0.88 Ca 0.06 Pb 0.06 CuSeO compound. 27 Pb doping arouse significant optimization in transport properties among all the element-doping researches.…”

Influence of Ch substitution on structural, electronic, and thermoelectric properties of layered oxychalcogenides (La0.5Bi0.5O)CuCh (Ch = S, Se, Te): a new insight from first principles

“…13 The layered oxychalcogenides (RO)TmCh (R ¼ La, Ce, Nd, Pr, Bi; Tm ¼ Cu, Ag; and Ch ¼ S, Se, Te) are the p-type semiconductors. The systems provide potential applications in thermoelectrics and optoelectronics 14 and are considered as the natural superlattice systems consisting of the insulating oxide and conducting chalcogenide layers. [15][16][17] The systems have (LaO)AgS-type crystal structure with the space group of P4/nmm (no.…”

Investigation of structural and electronic properties by pnictogen substitution in the layered oxypnictides (LaO)ZnPn (Pn = P, As, Sb)

“…Layered oxychalcogenides ( R O) TmCh ( R = La, Ce, Nd, Pr, Bi; Tm = Cu, Ag; and Ch = S, Se, Te) (space group: P 4/ nmm ) exhibit a p‐type semiconducting behavior, which is interesting for various applications, such as optoelectronics and thermoelectrics . For instance, (LaO)Cu Ch ( Ch = S, Se, Te) systems show a wide minimum band gap ( E g ) .…”