FREE shipping to on qualifying orders when you spend or more, processed by Ossila BV. All prices ex. VAT. Qualifying orders ship free worldwide! Fast, secure, and backed by the Ossila guarantee. It looks like you are visiting from , click to shop in or change country. Orders to the EU are processed by our EU subsidiary.

It looks like you are using an unsupported browser. You can still place orders by emailing us on, but you may experience issues browsing our website. Please consider upgrading to a modern browser for better security and an improved browsing experience.

Y7, BTP-4Cl

CAS Number 2414918-25-3

Materials, Non-Fullerene Acceptors

Product Code M2212A1-50mg
Price £210 ex. VAT

High purity, low price Y7 (BTP-4Cl) non-fullerene acceptor

Achieve record breaking NFA organic photovoltaic solar cell power conversion efficiencies

Specifications | Pricing and Options | MSDS | Literature and Reviews

Y7 (CAS number 2414918-25-3), 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).

High efficient non-flullerene acceptor

High efficient non-flullerene acceptor

with highly conjugated core

Expanded absorption range to near infrared

Expanded absorption range to near infrared

Large dipole moment induced by chloride substituents

Worldwide shipping for 2414918-25-3

Worldwide shipping

Quick and reliable shipping

High purity

High purity

>99% High purity

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

Chemical Structure

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

General Information

CAS Number 2414918-25-3
Chemical Formula C82H86Cl4N8O2S5
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-dichloro-3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile
Molecular Weight 1517.75 g/mol
HOMO / LUMO HOMO = -5.65 eV, LUMO = -3.63 eV [1]
Form Solid powder: Dark blue to black
Synonyms BTP-4Cl, Y6Cl, TTPTTI-4Cl
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.


Batch Quantity Price
M2212A1 50 mg £210
M2212A1 100 mg £370
M2212A1 250 mg £740
M2212A1 500 mg £1250
M2212A1 1 g £2300

MSDS Documentation


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.
Return to the top