Order Code: B511
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General Information

CAS number 2226464-70-4
Chemical formula C40H56F2S6Sn2
Molecular weight 1004.68 g/mol
Full name 2,6-bis(trimethytin)-4,8-bis(5-(2-ethylhexylthio)-4-fluorothiophen-2-yl)benzo[1,2-b:4,5-b’]dithiophene
  • BDT-SF-Sn
  • PCE13 monomer
  • (4,8-Bis(5-(2-ethylhexylthio)-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


BDTTDSFSn chemical structure, 2226464-70-4
Chemical structure of 2,6-bis(trimethytin)-4,8-bis(5-(2-ethylhexylthio)-4-fluorothiophen-2-yl)benzo[1,2-b:4,5-b’]dithiophene.



2,6-bis(trimethytin)-4,8-bis(5-(2-ethylhexylthio)-4-fluorothiophen-2-yl)benzo[1,2-b:4,5-b’]dithiophene (BDTTDSFSn) is an electron-rich building block that has been used for the synthesis of small molecules and low band-gap polymer semiconductors (such as PBDB-T-SF) for highly efficient OSCs and OPV applications.

Bearing two ethylhexyl thioalkyl side chains, with fused thiophenes and thiophenes as electron-rich pendants, BDTTDSFSn offers good solubility for the targeted compounds. 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. 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.
  2. Enhancing Indacenodithiophene Acceptor Crystallinity via Substituent Manipulation Increases Organic Solar Cell Efficiency, T. J. Aldrich et al, Chem. Mater., 29(24), 10294-10298 (2017); DOI: 10.1021/acs.chemmater.7b04616.
  3. A Large‐Bandgap Conjugated Polymer for Versatile Photovoltaic Applications with High Performance, M. Zhang et al., Adv. Mater., 27, 4655–4660 (2015); DOI: 10.1002/adma.201502110.