IEICO-4Cl

CAS Number 2240998-88-1

IEICO-4Cl, low bandgap NFA with absorption into the near-infrared

Available for priority dispatch with free shipping on qualifying orders

IEICO-4Cl (CAS number 2240998-88-1), a chlorinated version of IEICO-4F, has a structure with an electron-donating fused indaceno[1,2-b:5,6-b′]dithiophene (IDT) core flanked by two electron-withdrawing terminals, 2-(5,6-dichloro-3-oxo-2,3-dihydro-1H-inden-1-ylidene)malononitrile (IC-2Cl). IEICO-4Cl has an ultralow bandgap of 1.23 eV with weak absorption in the visible region, but extends its main absorption into the near-infrared (NIR) region (745-945 nm) with maximum absorption around 880 nm and an absorption onset of ≈1010 nm.

Organic tandem solar cell with PBDB-TF:IT-4F as active layer for the front cell and PTB7-Th:IEICO-4Cl:PC71BM as active layer for the real cell gained a power conversion efficiency (PCE) of 15.26%.

High efficient non-flullerene acceptor

with highly conjugated core

Expanded absorption range to near infrared

Large dipole moment induced by chloride substituents

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High purity

>99% High purity

Device structure: ITO/TIPD/PBDB-TF:IT-4F/m-PEDOT/TIPD/PTB7-Th:IEICO-4Cl:PC71BM/MoO3/Ag

Thickness (nm)	V_OC(V)	J_SC(mA cm^-2)	FF (%)	PCE (%)
105/150 nm	1.58	14.36	67.27	15.26

Our high purity (>99%) IEICO-4Cl is available for priority dispatch (lead times may apply for large quantities) and ships free with qualifying orders.

Chemical Structure

Literature and Reviews

Efficient Semitransparent Organic Solar Cells with Tunable Color enabled by an Ultralow-Bandgap Nonfullerene Acceptor, Y. Cui et al., Adv. Mater., 29 (43), 1703080 (2017); DOI: 10.1002/adma.201703080.
Efficient Organic Tandem Solar Cells Enabled by Solution-Processed Interconnection Layer and Fine-Tuned Active Layer, R. Zeng et al., Adv. Optical Mater., 9 (21), 2101246 (2021); DOI: 10.1002/adom.202101246.
Nonfullerene Acceptors for Semitransparent Organic Solar Cells, S. Dai et al., Adv. Energy Mater., 1800002 (2018); DOI: 10.1002/aenm.20180000.
π-Conjugated Polymers and Molecules Enabling Small Photon Energy Loss Simultaneously with High Efficiency in Organic Photovoltaics, M. Saito et al., J. Mater. Chem. A, 8, 20213-20237 (2020); DOI: 10.1039/D0TA05108J.
Thermodynamic Properties and Molecular Packing Explain Performance and Processing Procedures of Three D18:NFA Organic Solar Cells, Z. Wang et al., Adv. Mater., 32 (49), 2005386 (2020); DOI: 10.1002/adma.202005386.

General Information

CAS Number	2240998-88-1
Chemical Formula	C₁₁₄H₁₁₄Cl₄N₄O₄S₄
Purity	>99% (¹HNMR)
Full Name	2,2′-((2Z,2′Z)-(((4,4,9-tris(4-hexylphenyl)-9-(4-pentylphenyl)-4,9-dihydro-s-indaceno[1,2-b:5,6-b dithiophene-2,7-diyl)bis(4-((2-ethylhexyl)oxy)thiophene 5,2-diyl))bis(methanylylidene))bis(5,6-dichloro-3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile
Molecular Weight	1874.22 g/mol
Absorption	λ_max 802 nm (in chloroform), 887 nm (in film), NIR absorption
HOMO / LUMO	HOMO = -5.56 eV, LUMO = -4.23 eV; E_g = 1.33 eV [1]
Solubility	Chloroform, chlorobenzene
Form	Dark blue powder/crystals
Synonyms	IEICO-Cl
Classification / Family	NFAs, n-type non-fullerene electron acceptors, organic semiconducting materials, low band-gap small molecule, small molecular acceptor, organic photovoltaics, organic photodetectors (OPDs), polymer solar cells, NF-PSCs