Abstract
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•Solid state electrolytes based FDSSC essentially offer better stability.•Li-TFSI based electrolytes shows highest stability and performance.•TpTs derivative of TEMPOL are alternative for iodine-free transparent electrolytes.•Recent FDSSC structures and materials are summarized.
Fiber-shaped dye-sensitized solar cells (FDSSC) can fulfill the energy demand of portable electronic devices, specifically in remote applications; however, the stability of such systems is a bottleneck, due to the use of liquid electrolytes. Liquid electrolytes pose evaporation problem, leakage issue, and possibility of short circuit, hence solid electrolytes are the ultimate solution for long-lasting FDSSCs. Considering this, recent advances in solid electrolytes, photoanode materials, and counter electrode materials are summarized for all solid-FDSSCs. A special focus has been given to the types of solid electrolytes, their synthesis, and associated photovoltaic performance. The performance parameters of solid electrolytes, such as ionic conductivity, light transmittance, and photovoltaic performance are summarized in this review. Furthermore, the works related to novel photoanode and counter electrode materials employing solid electrolytes are also included in the review. A comparison table of power conversion efficiencies and lifetime of solid-state-FDSSCs is provided, which shows that the highest efficiency is possible for Li-TFSI (bis(trifluoromethane)sulfonimide lithium salt) soaked Iodide electrolytes. Better transparency and conductivity of such electrolytes are key parameters in imparting high efficiency of such electrolytes, i.e. 6.5%.