||99% (1H NMR)
||ITIC-F, IT-4F, ITIC-DF
|HOMO / LUMO
||HOMO = -5.66 eV, LUMO = -4.14 eV 
|Classification / Family
||NFAs, Organic semiconducting materials, Low band-gap small molecule, Small molecular acceptor, Organic photovoltaics, Polymer solar cells, NF-PSCs.
ITIC-2F shows a more red-shifted absorption than ITIC with an improved absorption coefficient, which can be ascribed to enhanced intramolecular charge transfer. For this reason, devices with ITIC-2F as acceptors can cover a broader absorption spectrum - which can potentially enhance the device PCEs.
ITIC-2F also has deeper HOMO/LUMO energy levels. This makes it a better match for most polymer semiconductor donors, and provides better stability for device fabrication and overall performance.
Efficiency of over 13% was achieved when ITIC-2F (IT-4F) was used as an acceptor with polymer PBDB-T-SF as the active-layer donor material with a inverted device structure: indium tin oxide (ITO)/ZnO/PBDB-T-SF:TI-4F (1:1)/MoO3/Al .
We also now have ITIC-DCl available as another NFA for highly efficient organic solar cells.
Characterisation (1H NMR)
Literature and Reviews
Molecular Optimization Enables over 13% Efficiency in Organic Solar Cells, W. Zhao at al., J. Am. Chem. Soc., 139 (21), 7148–7151 (2017); DOI: 10.1021/jacs.7b02677.
Energy-Level Modulation of Small-Molecule Electron Acceptors to Achieve over 12% Efficiency in Polymer Solar Cells, S. Li et al, Adv. Mater., 28, 9423–9429 (2016); DOI: 10.1002/adma.201602776.