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.
|Purity||>98% (1H NMR)|
|Form||Black deep-blue powder/crystals|
|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 |
|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 DocumentationCOTIC-4Cl MSDS Sheet
Literature and Reviews
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..
- 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.
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