Skip to main content
User Image

Abdullah Saleh Aldwayyan

Professor

Member of KSU scientific council as a representative of the college of sciences

كلية العلوم
College of Science, Physics and Astronomy Dept. Office 2A23
publication
Journal Article
2024

Electrical transport properties of [(1 − x)succinonitrile:xpoly(ethylene oxide)]–LiCF3SO3–Co[tris-(2,2′-bipyridine)]3(TFSI)2–Co[tris-(2,2′-bipyridine)]3(TFSI)3 solid redox mediators

A solid redox mediator (solid electrolyte) with an electrical conductivity (σ25°C) greater than 10−4 S cm−1 is an essential requirement for a dye-sensitized solar cell in the harsh weather of Gulf countries. This paper reports the electrical properties of solid redox mediators prepared using highly dissociable ionic salts: Co[tris-(2,2′-bipyridine)]3(TFSI)2, Co[tris-(2,2′-bipyridine)]3(TFSI)3, and LiCF3SO3 as a source of Co2+, Co3+, and Li+ ions, respectively, in a solid matrix: [(1 − x)succinonitrile:xpoly(ethylene oxide)], where x = 0, 0.5, and 1 in weight fraction. In the presence of large size of cations (Co2+ and Co3+) and large-sized and weakly-coordinated anions (TFSI− and CF3SO3−), only the succinonitrile–poly(ethylene oxide) blend (x = 0.5) resulted in highly conductive amorphous regions with σ25°C of 4.7 × 10−4 S cm−1 for EO/Li+ = 108.4 and 3.1 × 10−4 S cm−1 for EO/Li+ = 216.8. These values are slightly lower than 1.5 × 10−3 S cm−1 for x = 0 and higher than 6.3 × 10−7 S cm−1 for x = 1. Only blend-based electrolytes exhibited a downward curve in the log[thin space (1/6-em)]σ–T−1 plot, a low value of pseudo-activation energy (0.06 eV), a high degree of transparency, and high thermal stability, making it useful for device applications.

Publication Work Type
Research
more of publication
publications

In this study, we investigated the optoelectronic properties of cubic (Pm3m) and orthorhombic (Pnma) CsPbX3 (X = I, Br, and Cl). We utilized the full potential linear augmented plane wave method,…

by H. M. Ghaithan, S. M. H. Qaid, Z. A. Alahmed, H. S. Bawazir and A. S. Aldwayyan
2023
Published in:
Materials
publications

The goal of this research is to see how excitation wavelength affects steady-state photoluminescence (PL), time-resolved photoluminescence (TRPL), and amplified spontaneous emission (ASE) in…

by Qaid, SMH ; Ghaithan, HM Ghaithan,; Aldwayyan, AS
2023
publications

A solid redox mediator (solid electrolyte) with an electrical conductivity (σ25°C) greater than 10−4 S cm−1 is an essential requirement for a dye-sensitized solar cell in the harsh weather of Gulf…

by R. Gupta, H. Shaikh, A. Imran, I. Bedja, A.F. Ajaj, A. S. Aldwayyande, A. Khan and R. Ayub
2024