Photovoltaic Performance of Dye-Sensitized Solar Cells with a Solid-State Redox Mediator Based on an Ionic Liquid and Hole-Transporting Triphenylamine Compound

Minseon Kong, Da Hyeon Oh, Baekseo Choi and Yoon Soo Han
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Minseon Kong: Department of Advanced Materials and Chemical Engineering, Daegu Catholic University, Gyeongsan-si 38430, Korea
Da Hyeon Oh: Department of Advanced Materials and Chemical Engineering, Daegu Catholic University, Gyeongsan-si 38430, Korea
Baekseo Choi: Department of Advanced Materials and Chemical Engineering, Daegu Catholic University, Gyeongsan-si 38430, Korea
Yoon Soo Han: Department of Advanced Materials and Chemical Engineering, Daegu Catholic University, Gyeongsan-si 38430, Korea

Energies, 2022, vol. 15, issue 8, 1-13

Abstract: An ionic liquid, 1-methyl-3-propylimidazolium iodide (MPII), was solidified with an organic hole-transporting material, 4,4′,4″-tris[(3-methylphenyl)phenylamino]triphenylamine (m-MTDATA), and the resulting solid-state redox mediator (RM) (m-MTDATA-solidified MPII) was employed in solar devices to realize solid-state dye-sensitized solar cells (sDSSCs). Solar devices with only MPII or m-MTDATA as an RM showed almost 0 mA/cm 2 of short-circuit current ( J sc ) and thus 0% power conversion efficiency (PCE). However, an sDSSC with the m-MTDATA-solidified MPII exhibited 4.61 mA/cm 2 of J sc and 1.80% PCE. It was found that the increased J sc and PCE were due to the formation of I 3 − , which resulted from a reaction between the iodie (I − ) of MPII and m-MTDATA cation. Further enhancement in both J sc (9.43 mA/cm 2 ) and PCE (4.20%) was observed in an sDSSC with 4-tert butylpyridine (TBP) as well as with m-MTDATA-solidified MPII. We attributed the significant increase (about 230%) in PCE to the lowered diffusion resistance of I − /I 3 − ions in the solid-state RM composed of the m-MTDATA-solidified MPII and TBP, arising from TBP’s role as a plasticizer.

Keywords: dye-sensitized solar cell; solid-state redox mediator; ionic liquid; 4-tert butylpyridine; m-MTDATA (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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