A polymer electrolyte containing ionic liquid for possible applications in photoelectrochemical solar cells |
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Authors: | T M Wijendra Jayalath Bandara Piyasiri Ekanayake M A K Lakshman Dissanayake Ingvar Albinsson Bengt-Erik Mellander |
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Institution: | (1) Department of Physics and Postgraduate Institute of Science, University of Peradeniya, Peradeniya, Sri Lanka;(2) Department of Physical Sciences, Rajarata University of Sri Lanka, Mihintale, Sri Lanka;(3) Department of Applied Physics, Chalmers University of Technology, Gothenburg, Sweden;(4) Department of Physics, University of Gothenburg, Gothenburg, Sweden |
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Abstract: | Various iodide ion conducting polymer electrolytes have been studied as candidate materials for fabricating photoelectrochemical
(PEC) solar cells and energy storage devices. In this study, enhanced ionic conductivity values were obtained for the ionic
liquid tetrahexylammonium iodide containing polyethylene oxide (PEO)-based plasticized electrolytes. The analysis of thermal
properties revealed the existence of two phases in the electrolyte, and the conductivity measurements showed a marked conductivity
enhancement during the melting of the plasticizer-rich phase of the electrolyte. Annealed electrolyte samples showed better
conductivity than nonannealed samples, revealing the existence of hysteresis. The optimum conductivity was shown for the electrolytes
with PEO:salt = 100:15 mass ratio, and this sample exhibited the minimum glass transition temperature of 72.2 °C. For this
optimum PEO to salt ratio, the conductivity of nonannealed electrolyte was 4.4 × 10−4 S cm−1 and that of the annealed sample was 4.6 × 10−4 S cm−1 at 30 °C. An all solid PEC solar cell was fabricated using this annealed electrolyte. The short circuit current density (I
SC), the open circuit voltage (V
OC), and the power conversion efficiency of the cell are 0.63 mA cm−2, 0.76 V, and 0.47% under the irradiation of 600 W m−2 light. |
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