High-efficiency dye-sensitized solar cells fabricated using D-D-Π-A (donor-donor/Π-spacer-acceptor) architecture

Gachumale Saritha, Ramalinga Viswanathan Mangalaraja, Sambandam Anandan

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

Herein, we designed and synthesized two new metal-free organic dyes CCC ((E)-2-cyano-3-(6-((E)-(9-ethyl-9H-carbazol-3-ylimino)methyl)-9-hexyl-9H-carbazol-3-yl)acrylic acid) and CTC ((E)-2-cyano-3-(4-((4-((E)-(9-ethyl-9H-carbazol-3-ylimino)methyl) phenyl)(phenyl)amino)phenyl)acrylic acid) of D-D-π-A (donor-donor/π-spacer-acceptor) architecture. N-hexyl carbazole and triphenylamine were introduced as a donor as well as π-spacer, N-ethyl carbazole as an additional donor and cyano acrylic acid as acceptor. To evaluate photovoltaic properties of dye-sensitized solar cells (DSSCs), their photophysical, electrochemical and theoretical calculations were performed. The overall conversion efficiencies of the sensitizers CCC and CTC were 3.12% and 2.63%, respectively. Upon co-sensitized with N719 dye, fabricated solar cell with CCC dye showed highest short circuit current density of 19.33 mA/cm2, open circuit voltage of 0.745 V and fill factor of 0.473 resulting in highest power conversion efficiency (PCE) of 8.01%, which is higher than DSSCs based on individual dyes may be due to greater incident photon current conversion efficiency and broader visible light absorption.

Original languageEnglish
Pages (from-to)150-160
Number of pages11
JournalSolar Energy
Volume146
DOIs
StatePublished - 2017
Externally publishedYes

Keywords

  • Co-sensitization
  • Dye-sensitized solar cell
  • Electron injection
  • Electron lifetime
  • Metal-free organic dye

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