Order Code: B521
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General Information

CAS number 1514905-25-9
Chemical formula C40H56F2S4Sn2
Molecular weight  940.55 g/mol
Full name 2,6-bis(trimethytin)-4,8-bis(5-(2-ethylhexyl)-4-fluorothiophen-2-yl)benzo[1,2-b:4,5-b’]dithiophene
  • BDTT-F-Sn
  • 4,8-Bis(5-(2-ethylhexyl)-4-fluorothiophen-2-yl)benzo[1,2-b:4,5-b']dithiophene-2,6-diyl)bis(trimethylstannane)
Classification / Family Thiophene, Fused thiophene, Benzo-dithiophene heterocylic aromatics, Five-membered ring, Semiconductor synthesis intermediates, Low band-gap polymers, OFETs, Organic photovoltaics, Polymer solar cells

Product Details

Purity >99% (by HPLC)
Melting point n/a
Appearance Light yellow crystals
Chemical structure of 2,6-bis(trimethytin)-4,8-bis(5-(2-ethylhexyl)-4-fluorothiophen-2-yl)benzo[1,2-b:4,5-b’]dithiophene.



2,6-bis(trimethytin)-4,8-bis(5-(2-ethylhexyl)-4-fluorothiophen-2-yl)benzo[1,2-b:4,5-b’]dithiophene (BDTTDFSn) is an electron-rich building block used for the synthesis of either small molecular donors or low band-gap polymer semiconductors (like PBDB-T-F) for highly-efficient OSCs and OPV applications.

Bearing two ethylhexyl side chains, with fused benzodithiophenes and thiophenes as electron-rich pendants, BDTTDFSn offers good solubility for the targeted materials. The introduction of the fluoro atoms on the side thiophene rings can also lower the HOMO/LUMO energy levels of the desired polymers.


Literature and Reviews

  1. Over 14% Efficiency in Polymer Solar Cells Enabled by a Chlorinated Polymer Donor, S. Zhang et al., Adv.Mater., 30, 1800868 (2018); DOI: 10.1002/adma.201800868.
  2. Design of a New Small‐Molecule Electron Acceptor Enables Efficient Polymer Solar Cells with High Fill Factor, S. Li et al., Adv.Mater., 29, 1704051 (2017); DOI: 10.1002/adma.201704051.
  3. A High-Efficiency Organic Solar Cell Enabled by the Strong Intramolecular Electron Push–Pull Effect of the Nonfullerene Acceptor, W. Li et al., Adv.Mater., 30, 1707170 (2017); DOI: 10.1002/adma.201707170.