Poly(3-methylthiophene-co-3-octylthiophene) based solid-state photoelectrochemical device

Journal of the Brazilian Chemical Society

Tesfalidet Lemma¹  Teketel Yohannes¹ 

[1] ,Addis Ababa University Department of Chemistry Addis Ababa,Ethiopia

关键词: electrochemical copolymerization;    solid-state photoelectrochemical cell;    poly(3-methylthiophene-co-3-octylthiophene);    amorphous poly(ethylene oxide);    I3-/I- redox couple;   

DOI  :  10.1590/S0103-50532007000400022

来源: SciELO

【 摘 要 】

The copolymer, poly(3-methylthiophene-co-3-octylthiophene), was electrochemically synthesized from a mixture of 3-methylthiophene and 3-octylthiophene. Once the best condition for the copolymer formation was obtained a solid-state photoelectrochemical cell (PEC) was constructed and studied. The PEC contains the photoactive material poly(3-methylthiophene-co-3-octylthiophene), poly(3MT-co-3OT), coated on indium doped tin oxide (ITO) coated glass, an amorphous poly(ethylene oxide), POMOE, an ion conducting polymer electrolyte complexed with I3-/I- redox couple and an electrochemically polymerized poly(3,4-ethylenedioxythiophene) (PEDOT) coated on ITO-coated glass as a counter electrode. An open-circuit voltage of 165 mV and a short circuit current of 0.21 µA cm-2 were obtained with light illumination of approximately 100 mW cm-2. Incident monochromatic photon-to-current conversion efficiency (IPCE%) of 0.51 for front side (ITO/PEDOT) illumination and 0.15 for backside (ITO/poly(3MT-co-3OT)) illumination at wavelength of 460 nm were obtained. In addition, dependence of the short circuit current and open circuit voltage on light intensity and time of illumination were studied.

【 授权许可】

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