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Reductive Electropolymerization of a Vinyl-containing Poly-pyridyl Complex on Glassy Carbon and Fluorine-doped Tin Oxide Electrodes
Published on: January 30, 2015
Redox-mediated charge conduction in vacancy-ordered ruthenium halide perovskites
Vidya Raj1, Abhishek Anand1, Aravind Kumar Chandiran1,2
1Department of Chemical Engineering, Indian Institute of Technology Madras, Adyar, Chennai, Tamil Nadu 600036, India. aravindkumar@iitm.ac.in.
Abstract:
Vacancy-ordered double halide perovskites have gained attention as a stable and environmentally friendly alternative to organic-inorganic hybrid halide perovskites. However, despite extensive optimization, their theoretical efficiency remains unattained, and the fundamental charge conduction mechanism is not well understood. This study investigates the conduction mechanism in Cs2RuX6 (X = Br- and Cl-) using temperature-dependent Electrochemical Impedance Spectroscopy (EIS) and Raman spectroscopy. Our findings reveal the presence of redox-mediated charge conduction in this material class, attributed to multiple valence states. Cs2RuBr6 demonstrates superior conductivity, with correlated barrier hopping identified as the dominant conduction mechanism. In contrast, Cs2RuCl6 exhibits the coexistence of two conduction mechanisms: correlated barrier hopping and non-overlapping small polaron tunneling. This fundamental insight provides a pathway for addressing existing challenges and unlocking the full potential of this material class for a wide range of optoelectronic and photoelectrochemical applications.
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