Kim, J. Lee, H. Kim, D.Y. Kim, S. Seo, Y. 2024-01-19T21:01:40Z 2024-01-19T21:01:40Z 2021-08-31 2019-02 2059-8521 https://pubs.kist.re.kr/handle/201004/120440 We have developed new flexible dye-sensitized solar cells (DSSCs) comprising organic dye (JH-1), cobalt redox electrolyte and hierarchically structured TiO2 (HS-TiO2) photoelectrode prepared using an electrostatic spray method. The performance of JH-1 sensitized flexible DSSC with a cobalt redox electrolyte was compared with those of N719-based DSSC and DSSC with I-/I3- redox electrolyte. As a result, JH-1 sensitized flexible DSSC with [Co(III/II)(bpy-pz)3](PF6)3/2 redox system exhibited a high photocurrent density of 9.17 mA cm-2, an open circuit voltage of 0.953 V, a fill factor of 0.70, and a power conversion efficiency of 6.12% under 1 sun illumination (100 mW cm-2). The incident photon-to-current conversion efficiency was measured to explain the photocurrent generation difference by different dyes and electrolytes. The electron recombination lifetime of cells was measured by intensity-modulated photovoltage spectroscopy. Mass transport in DSSCs employing cobalt redox electrolytes was also investigated by the photocurrent transient measurements and electrochemical impedance spectroscopy (EIS) analysis. ？ 2019 Materials Research Society. English Materials Research Society Cobalt-based electrolytes for efficient flexible dye-sensitized solar cells Article 10.1557/adv.2019.126 1 MRS Advances, v.4, no.8, pp.481 - 489 MRS Advances 4 8 481 489 N scopus 2-s2.0-85083183947 Article Cobalt Conversion efficiency Efficiency Electrochemical impedance spectroscopy Electrolytes Flexible electronics Hydraulic structures Open circuit voltage Photocurrents Redox reactions Titanium dioxide Electron recombinations Flexible dye sensitized solar cell Incident photon-to-current conversion efficiencies Intensity modulated photovoltage spectroscopies (IMVS) Photocurrent density Photocurrent generations Photocurrent transients Power conversion efficiencies Dye-sensitized solar cells cobalt-based electrolyte flexible dye sensitized solar cell