IDT-2Br

CAS Number 2042521-91-3

IDT-2Br, NFA with excellent thermal stability and a strong, broad absorption

High purity (≥98%) and able to give device performances of up to 12.1% efficiency

IDT-2Br (CAS number 2042521-91-3), like o-IDTBR, has an electron-donating ladder-type fused five-member-ring indaceno[1,2-b:5,6-b′]dithiophene (IDT) core with 4-hexylphenyl side chains, flanked by two electron withdrawing benzothiadiazole moieties and rhodanine terminated groups.

IDT-2Br is a planar electron acceptor when it is compared with o-IDTBR, exhibiting excellent thermal stability, strong and broad absorption, relatively high electron mobility.

When PTB7-Th was used as the low band-gap donor polymer, mixed acceptors of F8IC and IDT-2Br demonstrated a great device performance with 12.1% efficiency

High efficient non-flullerene acceptor

with highly conjugated core

Planar molecular configuration

Excellent thermal stability, broad absorption and high electron mobility

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High purity

>99% High purity

Device structure: indium tin oxide (ITO)/ zinc oxide (ZnO)/PCE10:IDT-2BR:F8IC/molybdenum oxide (MoO₃)/Ag [2]

Thickness (nm)	V_OC(V)	J_SC (mA cm^-2)	FF (%)	PCE (%)
100 nm	0.687	25.1	69.9	12.1

Chemical Structure

Literature and Reviews

A planar electron acceptor for efficient polymer solar cells, Y. Wu et al., Energy Environ. Sci., 8, 3215-3221 (2015); doi: 10.1039/C5EE02477C.
High-performance ternary organic solar cells with photoresponses beyond 1000 nm, P. Xue et al., J. Mater. Chem. A, 6, 24210-24215 (2018); doi: 10.1039/C8TA09042D.

General Information

CAS Number	2042521-91-3
Chemical Formula	C₈₈H₈₈N₆O₂S₈
Purity	≥98% (¹H NMR)
Full Name	5,5'-[[4,4,9,9-Tetrakis(4-hexylphenyl)-4,9-dihydro-s-indaceno[1,2-b:5,6-b']dithiophene-2,7-diyl]bis(2,1,3-benzothiadiazole-7,4-diylmethylidyne)]bis[3-ethyl-2-thioxo-4-thiazolidinone]
Molecular Weight	1518.20 g/mol
Absorption	λ_max 636 nm (Chloroform); λ_max 658 nm (Film)
HOMO / LUMO	HOMO = -5.52 eV, LUMO = -3.69 eV [1]
Melting Point	TGA 367 °C (5% weight loss) (lit.)
Solubility	Chloroform, chlorobezene
Form	Dark blue powder/crystals
Synonyms	IDT2BR
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.