Steric Effect of N-Substituted Triphenylamine on Double-Anchored Phenothiazine Dye-Sensitized Solar Cells

Bo Yu Han, Tzu Ying Pan, Yi Chen Wu, Jiann T. Lin, Hsien Hsin Chou, Chun Ting Li*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Bulky N-substituents of 4-(hexyloxy) phenyl-substituted and 4-(hexylthio)phenyl-substituted triphenylamine (TPA) were successfully introduced into double-anchored phenothiazine (PTZ) dyes (TY1-TY3) as capping moieties for metal-free organic sensitizers in dye-sensitized solar cells (DSSCs). Among TY dyes, the N-substituent of 4-(hexyloxy)phenyl-substituted TPA provided the best steric matching to its double-anchored PTZ dye having a small π-bridge of thiophene (TY1) and thereby facilitated the most compact dye packing as well as formed the most integrated shelter layer on the TiO2 surface. Effective dark current suppression supported by TY1 resulted in a good DSSC performance of 10.47% at 1 sun and 21.2% at 1 klux (Philips T5 lamp) with the presence of chenodeoxycholic acid (CDCA) as the co-adsorbent; this cell efficacy was higher than that of the reference N719-based (9.10% at 1 sun) and HL5-based DSSCs (8.34% at 1 sun).

Original languageEnglish
Pages (from-to)3778-3788
Number of pages11
JournalACS Applied Energy Materials
Issue number7
Publication statusPublished - 2023 Apr 10


  • double-anchor
  • dye-sensitized solar cells
  • metal-free organic sensitizers
  • phenothiazine
  • triphenylamine

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Materials Chemistry
  • Electrical and Electronic Engineering


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