A visible-near-infrared absorbing A-π2-D-π1-D-π2-A type dimeric-porphyrin donor for high-performance organic solar cells

Song Chen, Lei Yan, Liangang Xiao, Ke Gao, Wei Tang, Cheng Wang, Chenhui Zhu, Xingzhu Wang*, Feng Liu*, Xiaobin Peng*, Wai-Kwok Wong, Xunjin Zhu*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

47 Citations (Scopus)
14 Downloads (Pure)

Abstract

Most of the currently available small molecule bulk heterojunction organic solar cells (BHJ OSCs) only utilize visible light and, to further increase the efficiency, the development of new organic materials that harvest near-infrared (NIR) light to produce an electric current is essential. Herein, a new A-π2-D-π1-D-π2-A type dimeric porphyrin-cored small molecule (CS-DP) is designed, synthesized and characterized. The use of CS-DP with a narrow bandgap (Eg) (1.22 eV) and the deep energy levels of the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) affords the highest power conversion efficiency of 8.29% in BHJ OSCs with PC71BM as an acceptor, corresponding to a short circuit current of 15.19 mA cm-2, an open circuit voltage of 0.796 V and a fill factor of 70% under AM 1.5G solar irradiation. The high device performance is attributed to the visible-near-infrared light-harvesting capability of CS-DP, and the super low energy loss feature. The energy loss (Eloss) lies between 0.43 and 0.51 eV in the system, which is related to the very small energy offset of the LUMOs between the CS-DP donor and PC71BM (ΔELUMO = 0.06 eV). The value of ΔELUMO, which is considered as a driving force for the photoinduced charge separation, is much smaller than the empirical threshold of 0.3 eV, but would not be a limiting factor in the charge separation process. The results indicate that there may be room for further improving the PCE for low bandgap dimeric porphyrin systems.

Original languageEnglish
Pages (from-to)25460-25468
Number of pages9
JournalJournal of Materials Chemistry A
Volume5
Issue number48
Early online date17 Nov 2017
DOIs
Publication statusPublished - Dec 2017

Scopus Subject Areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Fingerprint

Dive into the research topics of 'A visible-near-infrared absorbing A-π2-D-π1-D-π2-A type dimeric-porphyrin donor for high-performance organic solar cells'. Together they form a unique fingerprint.

Cite this