IEICO-4F is a low band-gap and low energy-loss material showing an A-D-A type structure with extra thiophenes as spacers between the acceptor and donor units. The structure has an electron-donating fused five-member-ring indaceno[1,2-b:5,6-b′]dithiophene (IDT) core, terminated by two electron-withdrawing units, 2-(5,6-difluoro-3-oxo-2,3-dihydro-1H-inden-1-ylidene)malononitrile (IC-2F). IEICO-4F extends into the near infrared (NIR) region with maximum absorption around 860 nm, 200 nm red-shifted compared to ITIC.
By incorporating a small molecule donor BIT-4F-T, combining the merits of complementary absorption of the visible light region (400 - 600 nm) to the polymer donor PTB7-Th and non-fullerene acceptor IEICO-4F, PTB7-Th:BIT-4F-T:IEICO-4F ternary organic solar cells showed improved efficiencies, reaching up to a PCE of 14.0%.
Device structure: ITO/ZnO (~35 nm)/PTB7-Th:BIT-4F-T:IEICO-4F (0.9:0.1:1, 10% BIT-4F-T) and (~150 nm)/MoOx (~7 nm)/Ag (~100 nm)
|Thickness (nm)||VOC(V)||JSC(mA cm-2)||FF (%)||PCE(%)|
|Form||Dark blue powder/crystals|
|Full name||2,2'-((2Z,2'Z)-(((4,4,9,9-tetrakis(4-hexylphenyl)-4,9-dihydro-sindaceno[1,2-b:5,6-b']dithiophene-2,7-diyl)bis(4-((2-ethylhexyl)oxy)thiophene-5,2- diyl))bis(methanylylidene))bis(5,6-difluoro-3-oxo-2,3-dihydro-1H-indene-2,1- diylidene))dimalononitrile|
|Synonyms||2,2'- [[4,4,9,9-Tetrakis(4-hexylphenyl)-4,9-dihydro-s-indaceno[1,2-b:5,6-b']dithiophene-2,7-diyl]bis]] [[4-[(2-ethylhexyl)oxy]-5,2-thiophenediyl]methylidyne(5,6-difluoro-3-oxo-1H-indene-2,1(3H)-diylidene) ]]bis[propanedinitrile]|
|Molecular weight||1808.40 g/mol|
|Absorption||λmax 865 nm (Film), NIR absorption|
|HOMO / LUMO||HOMO = -5.44 eV, LUMO = -4.19 eV |
|Classification / Family||NFAs, n-type non-fullerene electron acceptors,Organic semiconducting materials,Low band-gap small molecule, Small molecular acceptor, Organic photovoltaics, Polymer solar cells,NF-PSCs.|
MSDS DocumentationIEICO-4F MSDS Sheet
Literature and Reviews
- Spectral Engineering of Semitransparent Polymer Solar Cells for Greenhouse Applications, H. Shi et al., Adv. Energy Mater., 1803438 (2018); DOI: 10.1002/aenm.201803438.
- Dual Sensitizer and Processing-Aid Behavior of Donor Enables Efficient Ternary Organic Solar, Cells, X. Song et al., Joule 3, 846–857(2019); doi: 10.1016/j.joule.2019.01.009.
- A Near-Infrared Photoactive Morphology Modifier Leads to Significant Current Improvement and Energy Loss Mitigation for Ternary Organic Solar Cells, L. Zhan et al., Adv. Sci., 5, 1800755 (2018); DOI: 10.1002/advs.201800755.
- High Efficient Near-infrared and Semitransparent Polymer Solar Cells Based on an Ultra-Narrow Bandgap Nonfullerene Acceptor, J. Chen et al., J. Mater. Chem. A, 7, 3745-3751 (2019); doi: 10.1039/C8TA11484F.
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