Chae, Seung Hyun Yoo, Kicheon Lee, Yo Sub Cho, Min Ju Kim, Jong Hak Ko, Min Jae Lee, Suk Joong Choi, Dong Hoon 2024-01-20T09:31:49Z 2024-01-20T09:31:49Z 2021-09-05 2014-07 1088-4246 https://pubs.kist.re.kr/handle/201004/126630 Two novel donor-pi-acceptor (D-pi-A type) porphyrin dyes were successfully synthesized and use in a dye-sensitized solar cell (DSSC). The molecular structures of both porphyrins are composed of the same dialkyl-substituted diphenylamino unit acting as the donor part, and two bisalkoxyphenyl substituents at the 5,15-meso positions. The acceptor part is composed of different ethyne-linked pi-extended bridges, and a cyanoacrylic acid (Dye I) or carboxyphenyl (Dye II) moiety acting as anchoring groups. In order to investigate the effects of including the pi-extended bridge between the porphyrin and acceptor unit, two different pi-extended bridges such as 2,2'-bithiophene and 2-(phenylethynyl)thiophene, were employed. In particular, Dye II contains two triple bonds between donor substituted porphyrin and carboxylic acid group. These modifications could potentially reduce dye aggregation on the TiO2 surface. The charge recombination resistance and diffusion length for the cells with Dye II were relatively higher for all the measured ranges of bias potentials, implying that electron recombination loss from injected electrons was highly suppressed when Dye II molecules were adsorbed on the TiO2 surface. Eventually, Dye II containing a 2,2'-bithiophene pi-spacer and anchored trough a carboxyphenyl group exhibited a superior power conversion efficiency of 6.7% under AM 1.5 illumination (100 mW.cm(-2)) in a photoactive area of 0.46 cm(2) than Dye I with a 2-(phenylethynyl) thiophene (PCE = 3.5%) anchored through a cyanoacrylic group. English WORLD SCI PUBL CO INC EFFICIENCY IMPEDANCE DESIGN PERFORMANCE Novel pi-extended porphyrin derivatives for use in dye-sensitized solar cells Article 10.1142/S1088424614500308 1 JOURNAL OF PORPHYRINS AND PHTHALOCYANINES, v.18, no.7, pp.569 - 578 JOURNAL OF PORPHYRINS AND PHTHALOCYANINES 18 7 569 578 scie scopus 000341190400005 2-s2.0-84906683621 Chemistry, Multidisciplinary Chemistry Article EFFICIENCY IMPEDANCE DESIGN PERFORMANCE porphyrin photosensitizer dye-sensitized solar cell ruthenium power conversion efficiency