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Y7 (BTP-4Cl)

Product Code M2212A1

BTP-4Cl - Y7 - Y6Cl chemical structure
Chemical structure of Y7 (BTP-4Cl)

Y7, also known as BTP-4Cl, is the chlorinated version of Y6 (BTP-4F). It has an absorption range that extends to the near infrared (NIR) and has demonstrated a power conversion efficiency (PCE) up to 15.7% with PBDB-T-2F (PM6) as the polymer donor.

Like Y6, Y7 is a highly conjugated organic semiconductor and is composed of a fused thienothienopyrrolo-thienothienoindole (TTP-TTI) core base and 2-(5,6-dichloro-3-oxo-2,3-dihydro-1H-inden-1-ylidene)malononitrile (2ClIC) end units. Y7 has an A-DAD-A structure and is therefore electron deficient and hence suitable for use as a n-type non-fullerene electron acceptor (NFA) in OPV devices.

Compared to Y6, the chlorinated acceptor Y7 shows a redshift of about 20 nm in optical absorption and about 100 meV downshift in the LUMO level. Device film containing Y7 has a higher electroluminescence quantum efficiency (EQE = 3.47 × 10-4) than that of Y6 (1.40 × 10-4) with reduced non-radiative energy loss of ~ 24 meV. This reduced non-radiative energy loss yields a higher VOC of 0.867 V compared with that of the Y6 based device (0.834 V).

Record PCEs of 16.5% and 15.3% for OPV cells with 0.09 and 1 cm2 active areas were achieved when PBDB-T-2F (PM6) was used as the polymer donor and Y7 as the acceptor with the following device structure.

Device structure: ITO/ZnO/PM6:Y7/MoO3/Al.

Thickness (nm) VOC (V) JSC (mA cm-2) FF (%) PCE (%)
100 ± 4 0.867 25.4 75.0 16.5 (16.1 ± 0.2)

Characterisation (1H NMR)

Y7, BTP-4Cl 1H NMR
1H-NMR spectrum of Y7 (BTP-4Cl) in CDCl3

General Information

Purity >99% (1H NMR)
Form Solid powder: Dark blue to black
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-dichloro-3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile
Synonyms BTP-4Cl, Y6Cl, TTPTTI-4Cl
Chemical formula C82H86Cl4N8O2S5
CAS number 2414918-25-3
Molecular weight 1517.75 g/mol
HOMO / LUMO HOMO = -5.65 eV, LUMO = -3.63 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.

MSDS Documentation



Batch Quantity Price
M2212A1 25 mg £249.00
M2212A1 50 mg £299.00
M2212A1 100 mg £449.00
M2212A1 250 mg £990.00
M2212A1 500 mg £1880.00
M2212A1 1 g £3360.00

Literature and Reviews

  1. Over 16% efficiency organic photovoltaic cells enabled by a chlorinated acceptor with increased open-circuit voltages, Y Cui et al., Nat. Commun., 10, 2515 (2019 doi: 10.1038/s41467-019-10351-5
  2. Single-Junction Organic Solar Cell with over 15% Efficiency Using Fused-Ring Acceptor with Electron-Deficient Core, J. Yuan et al., Joule (2019); doi: 10.1016/j.joule.2019.01.004.
  3. Achieving over 16% efficiency for single-junction organic solar cells, B. Fan et al., Sci. China Chem., 62, 6 746-752 (2019); doi: 10.1007/s11426-019-9457-5.

To the best of our knowledge the technical information provided here is accurate. However, Ossila assume no liability for the accuracy of this information. The values provided here are typical at the time of manufacture and may vary over time and from batch to batch.