Y6 (BTP-4F) is a highly conjugated organic semiconductor. It is composed of a fused thienothienopyrrolo-thienothienoindole (TTP-TTI) core base and 2-(5,6-difluoro-3-oxo-2,3-dihydro-1H-inden-1-ylidene)malononitrile (2FIC) end units. These 2FIC end units are believed to promote intermolecular interactions and enhance optical absorption.
Having a A-DAD-A structure, it is electron deficient and is used in highly efficient OPV devices as a non-fullerene electron acceptor (NFA).
The absorption of Y6 has a maximum at around 810 nm and extends to 1100 nm (corresponding to the near infra-red).
Optimised photovoltaic devices using Y6 as the acceptor and PBDB-T-2F (PM6) as the polymer donor can demonstrate efficient device performance with power conversion efficiencies (PCEs) of up to 15.7%.
Device structure: ITO/PEDOT:PSS/PM6:Y6/PDINO/Al.
| Thickness (nm) | VOC (V) | JSC (mA cm-2) | FF (%) | PCE (%) |
| 150 | 0.86 | 25.3 | 74.8 | 15.7 |
Characterisation (1H NMR)
General Information
| Purity | >99% (1H NMR) |
| Full name | 2,2'-((2Z,2'Z)-((12,13-bis(2-ethylhexyl)-3,9-diundecyl-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(5,6-difluoro-3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile |
| Synonyms | TTPTTI-4F, BTPTT-4F, BTP-4F, Y6F, BTP-4F-8 |
| Chemical formula | C82H86F4N8O2S5 |
| CAS number | 2304444-49-1 |
| Molecular weight | 1451.93 g/mol |
| HOMO / LUMO | HOMO = -5.65 eV, LUMO = -4.10 eV [1] |
| 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. |