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.

Product Code M2249A1-100mg
Price $450 ex. VAT

Quality assured

Expert support

Volume discounts

Worldwide shipping

Fast and secure

BTP-eC9, Y series n-type non-fullerene acceptor with NIR absorption

Available to buy online or request a quote today and enjoy discounts on large quantities

BTP-eC9 is a family member of the Y series of n-type non-fullerene semiconducting acceptors. It has been proven that these NFAs can achieve high device performance in non-fullerene polymer solar cells (NF-PSCs).

With a fused thienothienopyrrolo-thienothienoindole (TTP-TTI) core, BTP-eC9 is a modified version of Y7 but with better solubility. Comparing to Y6, chlorination at the peripheral end-groups can efficiently lower HOMO/LUMO energy levels. C–Cl bond also has a large dipole moment, expanding the absorption range further to near infrared (NIR) region.

High efficient non-flullerene acceptor

High efficient non-flullerene acceptor

With highly conjugated core

Expanded absorption range to near infrared

Expanded absorption range

large dipole moment induced by chloride substituents

Worldwide shipping for BTP-eC9

Worldwide shipping

Quick and reliable shipping

Green energy material

Green energy materials

Processable in non-halogenated solvents

A device efficiency approaching 18% has been reported using BTP-eC9 as the electron acceptor and PBDB-T-2F (PM6) as electron donor in single junction organic photovoltaic cells.

Device structure: ITO/PEDOT:PSS/PBDB-T-2F:BTP-eC9 (1:1.2)/PFN-Br/Al

Thickness (nm) VOC (V) JSC (mA cm-2) FF (%) PCE (%)
100 0.839 26.2 81.1 17.8

Chemical Structure

BTP-eC9 chemical structure
Chemical structure of BTP-eC9

Literature and Reviews

  1. Single-Junction Organic Photovoltaic Cells with Approaching 18% Efficiency, Y. Cui et al., Adv. Mater., 32 (19), 1908205 (2020); DOI: 10.1002/adma.201908205.
  2. Self-assembled Monolayer Enables Hole Transport Layer-Free Organic Solar Cells with18% Efficiency and Improved Operational Stability, Y. Lin et al., ACS Energy Lett., 5, 9, 2935–2944 (2020); DOI: 10.1021/acsenergylett.0c01421.
  3. Chlorination: An Effective Strategy for High-Performance. Organic Solar Cells, Q. Zhao et al., Adv. Sci., 7, 2000509 (2020); DOI: 10.1002/advs.202000509.

General Information

CAS Number 2598965-39-8
Chemical Formula C86H94Cl4N8O2S5
Full Name 2,2'- [[12,13-Bis(2-butyloctyl)-12,13-dihydro-3,9-dinonylbisthieno[2'',3'':4',5']thieno[2',3':4,5]pyrrolo[3,2-e:2',3'-g][2,1,3]benzothiadiazole-2,10-diyl]bis[methylidyne(5,6-chloro-3-oxo-1H-indene-2,1(3H)-diylidene) ]]bis[propanedinitrile]
Molecular Weight 1573.89 g/mol
HOMO / LUMO HOMO = -5.64 eV, LUMO = -4.05 eV [1]
Solubility Chloroform, chlorobenzene and dichlorobenzene
Form Dark blue powder/crystal
Synonyms eC9, BTP-eC9
Classification / Family BTP series 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

BTP-eC9 MSDS SheetBTP-eC9 MSDS sheet


Batch Quantity Price
M2249A1 100 mg £360
M2249A1 250 mg £720
M2249A1 500 mg £1250
M2249A1 1 g £2300
M2249A1 5 g / 10 g* Please contact us for details

*for 5 – 10 grams order quantity, the lead time is 4 – 6 weeks.

To the best of our knowledge the information provided here is accurate. The values provided are typical at the time of manufacture and may vary over time and from batch to batch. Products may have minor cosmetic differences (e.g. to the branding) compared to the photos on our website. All products are for laboratory and research and development use only.

Return to the top