Design and synthesis of trithiophene-bound excited-state intramolecular proton transfer dye: Enhancement on the performance of bulk heterojunction solar cells

Dong Yi Chen, Chyi Lin Chen, Yi Ming Cheng, Cheng Hsuan Lai, Jian Yuan Yu, Bo So Chen, Cheng Chih Hsieh, Hsieh Chih Chen, Li Yin Chen, Ching Yen Wei, Chung Chih Wu, Pi Tai Chou*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

In an aim to harvest UV-near-visible (360-440 nm) photons as well as to increase the morphology in the bulk heterojunction solar cells, we report herein the strategic design, synthesis, and characterization of a novel excited-state intramolecular proton-transfer dye, 3-hydroxy-2-(5-(5-(5-(3-hydroxy-4-oxo-4H- chromen-2-yl)thiophen-2-yl)thiophen-2-yl)thiophen-2-yl)-4H-chromen-4-one (FT), which bears two key functional groups, namely 3-hydroxychromone chromophore and trithiophene backbone and is then exploited into the blends of regioregular poly(3-hexylthiophene) (RR-P3HT) and phenyl-C61-butyric acid methyl ester (PCBM). FT acts as an excellent UV-near visible absorber, which then undergoes excited-state intramolecular proton transfer, giving rise to an orange-red proton-transfer emission that was reabsorbed by P3HT via a Förster type of energy transfer. Introduction of FT to P3HT/PCBM blend films also improves the morphology of phase separated structure, in particular, enhances the interaction of P3HT chains and the hole mobility. In this work, under the optimized condition of P3HT: PCBM:FT of 15:9:2 in weight ratio, the best performance of the device B-FT2 revealed consistent enhancements in the efficiency (η) 4.28% and short-circuit current (Jsc) 12.53 mAcm-2, which are higher than that (3.68% and 10.28 mAcm -2) of the best performance of the control device B (P3HT:PCBM 15:9 in weight ratio) by 16 and 22%, respectively.

Original languageEnglish
Pages (from-to)1621-1629
Number of pages9
JournalACS Applied Materials and Interfaces
Volume2
Issue number6
DOIs
StatePublished - 23 Jun 2010

Keywords

  • bulk-heterojunction
  • excited-state intramolecular proton transfer
  • flavone
  • solar cell

Fingerprint Dive into the research topics of 'Design and synthesis of trithiophene-bound excited-state intramolecular proton transfer dye: Enhancement on the performance of bulk heterojunction solar cells'. Together they form a unique fingerprint.

Cite this