Structurally, L8-BO-F has the same thienothienopyrrolo-thienothienoindole (TTP-TTI) core units as L8-BO (L8-BO-2F) with mono-fluorinated peripheral 2-(5 or 6-fluoro-3-oxo-2,3-dihydro-1H-inden-1-ylidene)malononitrile end-groups.
L8-BO-F is another highly efficient non-fullerene acceptor that belongs to Y6 family. Similar to L8-BO, it has a branched 2-butyloctyl side chain which not only promotes solubility but also improves the morphology to achieve better packed film with higher intermolecular stackings, balanced charge transport and to reduce charge combination. L8-BO-F is also believed to suppresses the non-radiative recombination leading to a reduce the voltage loss.
Outstanding device performance with PCE of 18.66% has achieved while a binary BTP-eC9 and L8-BO-F non-fullerene acceptors were used with polymer donor PM6. The polymer donor and mixed NFAs give complementary absorptions in the visible and NIR region with well matched energy alignment.
Device structure: ITO/PEDOT:PSS/PM6:BTP-eC9:L8-BO-F (1:1.2)/PNDIT-F3N/Ag
|Thickness (nm)||VOC (V)||JSC (mA cm-2)||FF (%)||PCE (%)|
|Purity||>99% (1H NMR)|
|Full name||2,2'-((2Z,2'Z)-((12,13-bis(2-ethylhexyl)-3,9-(2-butyloctyl)-12,13-dihydro-[1,2,5]thiadiazolo[3,4-e]thieno[2",3’':4’,5']thieno[2',3':4,5]pyrrolo[3,2-g]thieno[2',3':4,5]thieno[3,2-b]indole-2,10-diyl)bis(methanylylidene))bis(5 or 6-fluoro-3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile
|Molecular weight||1444.00 g/mol|
|HOMO / LUMO||HOMO = -5.59 eV, LUMO = -3.85 eV |
|Solubility||Chloroform, chlorobenzene and dichlorobenzene|
|Form||Dark blue powder/crystal|
|Classification / Family||BTP series 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.|
|M2306A1||5 g / 10 g*||Please contact us for details|
*for 5 - 10 grams order quantity, the lead time is 4-6 weeks.
Literature and Reviews
- A Well-Mixed Phase Formed by Two Compatible Non-Fullerene Acceptors Enables Ternary Organic Solar Cells with Efficiency over 18.6%, Y. Cai et al., Adv. Mater., 33 (33); 2101733 (2021); DOI: 10.1002/adma.202101733.
A facile strategy for third-component selection in non-fullerene acceptor-based ternary organic solar cells, Y. Li et al., Energy Environ. Sci., 14, 5009-5016 (2021); DOI: 10.1039/D1EE01864G.
- Non-fullerene acceptors with branched side chains and improved molecular packing to exceed 18% efficiency in organic solar cells, C. Li et al., Nat. Energy, 6, 605–613 (2021); DOI: 10.1038/s41560-021-00820-x.
- High-efficiency organic solar cells with low voltage loss induced by solvent additive strategy, J. Song et al., Matter, 4 (7), 2542-2552 (2021); DOI: 10.1016/j.matt.2021.06.010.
- 18.77 % Efficiency Organic Solar Cells Promoted by Aqueous Solution Processed Cobalt(II) Acetate Hole Transporting Layer, H. Meng et al., Angew. Chem, 133 (41); 22728-22735 (2021); DOI: 10.1002/ange.202110550.
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