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    Electrolyte membranes based on ultrafine fibers of acetylated cellulose for improved and long-lasting dye-sensitized solar cells

    Year: 2019

    Journal: Cellulose, Volume 26, JUL, page 6151–6163

    Authors: Kaschuk, Joice Jaqueline; Miettunen, Kati; Borghei, Maryam; Frollini, Elisabete; Rojas, Orlando J.

    Organizations: Aalto University; SAo Paulo Research Foundation - FAPESPFundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [2017/13500-2]; CNPq (National Counsel of Technological and Scientific Development, Brazil)Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPQ); Academy of Finland (project BioEST)Academy of Finland [318557]; Academy of Finland's Flagship Programme [318890, 318891]

    Keywords: Photovoltaics; Solar cells; Electrospun membranes; Cellulose acetate; Electrolyte; Stability

    Electrospun nanofibers obtained from cellulose acetate before (CA) and after (DCA) deacetylation were used as electrolyte membranes in dye-sensitized solar cells. As holders of the active components of the device and compared to the reference system, the CA and DCA membranes increased the average device efficiency by as much as 14%. The membranes enhanced the charge transfer at the counter electrode (assessed by the Ohmic and charge transfer resistance and corresponding Helmholtz capacitance). Simultaneously, the photoelectrode did not interfere with the performance as measured by the short-circuit current density, open circuit voltage, fill factor and conversion efficiency. Long-term stability tests (light soaking) showed that the CA- and DCA-based solar cells sustain operation for at least 500h. For long term use and/or to serve as a scaffold for other purposes, DCA performs better than CA. The proposed active electrolyte membranes are expected to open the way toward rapid and continuous assembly of dye sensitize solar cells using cellulose esters. [GRAPHICS] .
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