화학공학소재연구정보센터
Inorganic Chemistry, Vol.59, No.3, 1577-1581, 2020
One-Dimensional Chains in Pentanary Chalcogenides A(2) Ba3Cu2Sb2S10 (A = K, Rb, Cs) Displaying a Photocurrent Response
The discovery of new inorganic functional chalcogenides is of fundamental importance in structure chemistry and materials science. Herein, a new type of pentanary thioantimonates, A(2)Ba(3)Cu(2)Sb(2)S(10) (A = K, Rb, Cs), has been discovered by a solvothermal method at low temperature. These isostructural compounds belong to the monoclinic space group C2/m (No. 12) and comprise unique one-dimensional (1D) [Cu2Sb2S10](8-) chains surrounded by discrete A(+) and Ba2+ cations. Such a 1D chain structure is the first case of chalcogenides in the X/Cu/Sb/Q (X = cations; Q= chalcogen) system. The energy gaps range from 1.90 to 1.98 eV for A(2)Ba(3)Cu(2)Sb(2)S(10) (A = K, Rb, Cs) were obtained from the UV-visible reflectance spectroscopy. Moreover, Rb(2)Ba(3)Cu(2)Sb2S(10) displays an intriguing photocurrent response under simulated solar-light illumination. The theoretical calculations were also carried out to understand the interrelationship of the optical performance and electronic structure.