A low molecular mass organogelator electrolyte with TiO 2 nanoparticles for stable and efficient quasi-solid-state dye sensitized solar cells

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RSC Advances, ISSN: 2046-2069, Vol: 7, Issue: 13, Page: 7671-7678

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Wubshet Mekonnen Girma; Chia-Hung Chen; Cheng-Hsien Yang; Po-I. Wang; Keng-Liang Ou; Der-Jang Liaw; Jia-Yaw Chang
Royal Society of Chemistry (RSC); The Royal Society of Chemistry
Chemistry; Chemical Engineering
article description
We report stable and efficient quasi-solid-state dye-sensitized solar cells (QS-DSSCs) fabricated using a combination of TiOnanoparticles and a low-molecular-mass organogelator (LMOG) as a nanoparticle-gel composite electrolyte. Three types of electrolyte, namely liquid, LMOG-based gel, and nanoparticle-gel composite, are used. The results of electrochemical impedance spectroscopy and intensity-modulated photocurrent/photovoltage spectroscopy measurements suggest that the presence of TiOnanoparticles in the nanoparticle-gel composite electrolyte could afford faster electron transport and a longer electron recombination time compared to the liquid and LMOG-based gel electrolytes. The QS-DSSC using the nanoparticle-gel composite electrolyte with the optimal TiOcontent exhibits a power conversion efficiency of 7.79%, which is significantly higher than that of devices using the liquid (7.22%) and LMOG-based gel (7.21%) electrolytes. Remarkably, the QS-DSSCs with the optimal nanoparticle-gel composite electrolyte exhibit long-term stability over 10 days, unlike the liquid electrolyte-based cells.