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CAS Number 2077945-91-4

Materials, Non-Fullerene Acceptors

Product Code M2238A1-100mg
Price £380 ex. VAT

o-IDTBR, widely used as an n-type NFA in organic polymer photovoltaics

Available to buy online with free shipping on qualifying orders

Specifications | Pricing and Options | MSDS | Literature and Reviews

o-IDTBR, CAS number 2077945-91-4, is a small molecule acceptor which demonstrates an acceptor-acceptor–donor–acceptor-acceptor (A-A'–D–A'-A) structure. This consists of an electron-donating ladder-type fused five-member-ring indaceno[1,2-b:5,6-b′]dithiophene (IDT) core with aliphatic n-octyl side chains flanked by two electron withdrawing benzothiadiazole moieties and rhodanine terminated groups.

With a maximum absorption at around 600 – 730 nm and reduced charge recombination losses, o-IDTBR has been widely used as an n-type non-fullerene acceptor (NFA) in polymer organic photovoltaics. Among its useful properties, it shows promising stability under ambient conditions and exhibits outstanding photovoltaic performance.

Using PTB7-Th as the low band-gap donor polymer, mixed acceptors of o-IDTBR and o-IDFBR have demonstrated impressive device performance. An efficiency of 11.0 ± 0.4% and a high open-circuit voltage of 1.03 ± 0.01 has been reported.

High efficient non-flullerene acceptor

High efficient non-flullerene acceptor

with highly conjugated core

Low Cost o-IDTBR

Low Cost

Low Cost o-IDTBR

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High purity

High purity

>98% High purity

Device structure: indium tin oxide (ITO)/ zinc oxide (ZnO)/PCE10:IDTBR:IDFBR (85 ± 5 nm) /molybdenum oxide (MoO3)/Ag [2]

Thickness (nm) VOC (V) JSC (mA cm-2) FF (%) PCE (%)
85 ± 5 1.03 ± 0.01 17.2 ± 0.1 60 ± 1 11.0 ± 0.4

o-IDTBR is available to buy online in quantities from 100 mg to 1 g (please contact us for larger orders). Larger quantities offer the best value, while smaller quantities may be more suitable for some applications. Eligible orders ship free.

General Information

CAS Number 2077945-91-4
Chemical Formula C72H88N6O2S8
Purity >98% (1HNMR)
Full Name (5Z,5'Z)-5,5'-((7,7'-(4,4,9,9-tetraoctyl-4,9-dihydro-s-indaceno[1,2-b:5,6-b']dithiophene-2,7-diyl)bis(benzo[c][1,2,5]thiadiazole-7,4-diyl))bis(methanylylidene))bis(3-ethyl-2-thioxothiazolidin-4-one)
Molecular Weight 1326.03 g/mol
Absorption λmax 600 – 730 nm (Film)

HOMO = -5.56 eV

LUMO = -3.93 eV [1]

Melting Point 219 – 221 °C (lit.)
Solubility Chloroform, chlorobezene
Form Dark blue powder/crystals
Synonyms IDTBR
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

Chemical Structure

EH-IDTBR chemical structure, CAS 2077945-91-4
Chemical structure of o-IDTBR, CAS 2077945-91-4

MSDS Documentation



Batch Quantity Price
M2238A1 100 mg £380
M2238A1 250 mg £760
M2238A1 500 mg £1250
M2238A1 1 g £2300

Literature and Reviews

  1. Carrier Transport and Recombination in Efficient “All-Small-Molecule” Solar Cells with the Nonfullerene Acceptor IDTBR, R. Liang et al., Adv. Energ. Mater., 8 (19), 1800264 (2018); doi: 10.1002/aenm.201800264.
  2. Reducing the efficiency–stability–cost gap of organic photovoltaics with highly efficient and stable small molecule acceptor ternary solar cells, D. Baran et al., Nat. Nater., 16, 363–369(2017); doi: org/10.1038/nmat4797.
  3. A Wide-Bandgap Donor Polymer for Highly Efficient Non-fullerene Organic Solar Cells with a Small Voltage Loss, S. Chen et al., J. Am. Chem. Soc., 139, 18, 6298–6301 (2017); doi: 10.1021/jacs.7b01606.
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