This study focuses on the performance and stability of quasi-solid-state dye-sensitized solar cells (QS-DSSCs) with Cu2+/Cu1+ redox couple using various types of polymer gel electrolytes (PGEs) under specific conditions. Firstly, the performance of the device utilizing 7 wt% PVDF-HFP is evaluated under one sun condition. Although the efficiency is slightly lower than the liquid-state cell, the quasi-solid-state cell demonstrates promising performance, revealing much better stability than the liquid-state cell. It shows that the QS-DSSCs can maintain an efficiency of almost 100% of their initial value after 700 hours. Next, the electrolyte composition is optimized for indoor light conditions. Experimental results indicate that a lower concentration of Cu(dmby)2(TFSI)/Cu(dmby)2(TFSI)2 is advantageous for higher short-circuit current density due to lower light absorbance. By optimizing the electrolyte composition of Cu(dmby)2TFSI, Cu(dmby)2TFSI2, NMBI, and LiTFSI for indoor light conditions, the device can achieve an efficiency of 26.95% under 2000 lux illumination. Finally, the application of printable PGEs under indoor light conditions is investigated. It is found that the addition of PMMA and PVDF to the PEO electrolytes can enhance the open-circuit voltage and conversion efficiency of the devices, ascribed to the increase in the recombination resistance. Consequently, efficiencies of 23.97% and 24.19% respectively, were obtained for devices utilizing PEO+PMMA and PEO+PVDF under 2000 lux illumination.

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