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Product Code M2340A1
Price $450.00 ex. VAT

COTIC-4Cl, used to extend spectral response in organic photodiodes

Ultra-narrow bandgap n-type semiconductor with NIR absorption, available to buy online

COTIC-4Cl has a chemical structure containing an electron rich cyclopentadithiophene (CPDT) as the central donor unit flanked with alkoxythienyl units and two 2-(5,6-dichloro-3-oxo-2,3-dihydro-1H-inden-1-ylidene)malononitrile (IC-2Cl) accepting peripheral units.

Compared to COTIC-4F, COTIC-4Cl film has an absorption that extends to near infrared (NIR) and exhibits broad absorption with a strong absorption band, which ranges from 600 to about 1400 nm. COTIC-4Cl is a ultra-narrow bandgap n-type semiconductor with an optical bandgap of ~ 1.0 eV.

COTIC-4Cl can be used for organic photodiodes to extend the spectral response range over 1000 nm. Ternary organic photodiodes photodiodes based on PCE10:COTIC-4Cl:PC71BM as active layer materials exhibited a high specific detectivity (D*) of 5 × 1012 Jones and a responsivity (R) of 0.30 A W-1 at 1100 nm.

Chemical Structure

cotic-4cl chemical structure, cas# 2328092-51-7
Chemical structure of COTIC-4Cl, CAS 2328092-51-7

Literature and Reviews

  1. Ternary organic photodiodes with spectral response from 300 to 1200 nm for spectrometer application, Z. Zhong et al., Sci. China Mater., 64(10): 2430–2438 (2021);  DOI: 10.1007/s40843-020-1639-x..
  2. Near-infrared organic photoelectric materials for light harvesting systems: Organic photovoltaics and organic photodiodes, B. Xie et al., InfoMat., 2, 57–91 (2020); DOI: 10.1002/inf2.12063.

General Information

CAS Number 2328092-51-7
Chemical Formula C75H78Cl4N4O4S4
Purity >98% (1H NMR)
Full Name 2,2'-((2Z,2'Z)-(((4,4-bis(2-ethylhexyl)-4H-cyclopenta[2,1-b:3,4-b']dithiophene-2,6-diyl)bis(4-(2-ethylhexyloxy)thiophene-5,2-diyl))bis(methanylylidene))bis(5,6-dichloro-3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile
Molecular Weight 1369.52 g/mol
Absorption λmax 873 nm (in CB); 1005 nm (in film), 600 - 1400 nm >
HOMO / LUMO HOMO = -5.24 eV, LUMO = -4.02 eV, Eg, opt> = 0.99 eV [1]>
Solubility Chloroform, chlorobenzene
Form Black deep-blue powder/crystals
Synonyms COTIC-4Cl
Classification / Family NFAs, n-type non-fullerene electron acceptors, Organic semiconducting materials, Low band-gap small molecule, Small molecular acceptor, Organic photovoltaics, Organic photodiodes (OPDs), NF-PSCs.

MSDS Documentation



Batch Quantity Price
M2246A1 100 mg £360
M2246A1 250 mg £720
M2246A1 500 mg £1250
M2246A1 1 g £2300

To the best of our knowledge the information provided here is accurate. However, Ossila assume no liability for the accuracy of this page. The values provided are typical at the time of manufacture and may vary over time and from batch to batch. All products are for laboratory and research and development use only, and may not be used for any other purpose including health care, pharmaceuticals, cosmetics, food or commercial applications.

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