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9 November 2020 Effect of electrolyte for back contact transparent conducting oxide-less dye-sensitized solar cells: iodine versus cobalt
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Abstract

Grätzel solar cells are reported in a transparent conducting oxide-less (TCO-less) back-contact dye-sensitized solar cell (BC-DSC) architecture using a stainless steel mesh-protected working electrode along with nanoporous TiO2 semiconductor and metal-free D205 dye. Liquid electrolytes play a significant role for the dye regeneration in the working operation of TCO-less BC-DSCs; therefore, we report the effectiveness of two different commonly utilized electrolytes (iodine- and cobalt-based redox shuttles) for the construction and performance of TCO-less dye-sensitized solar cells (DSCs). Differential performance of DSCs thus fabricated was interpreted utilizing impedance spectral and lifetime analysis. It was found that although utilization of cobalt bipyridyl complex-based electrolyte was able to harvest higher photons in the lower wavelength region (330 to 430 nm) as compared to its iodine electrolyte counterparts, hampered dye regeneration due to reduced driving force and slower ion diffusion in combination with higher charge transport resistance at TiO2  /  dye  /  electrolyte was responsible for relatively hampered photovoltaic performance at peak absorption.

© 2020 Society of Photo-Optical Instrumentation Engineers (SPIE) 1947-7988/2020/$28.00 © 2020 SPIE
Md. Zaman Molla, Ajay Kumar Baranwal, Shuzi Hayase, and Shyam S. Pandey "Effect of electrolyte for back contact transparent conducting oxide-less dye-sensitized solar cells: iodine versus cobalt," Journal of Photonics for Energy 10(4), 045501 (9 November 2020). https://doi.org/10.1117/1.JPE.10.045501
Received: 3 August 2020; Accepted: 22 October 2020; Published: 9 November 2020
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