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Product Code M2257A1-100mg
Price $650 ex. VAT

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BTR-Cl, highly crystalline small molecular donor

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Like its BTR derivative, BTR-Cl has a backbone consisting of a benzodithiophene (BDT) unit in conjugation with two terthiophenes and two rhodanine periphera end groups forming a coplanar structure showing nematic liquid crystal behaviour.

BTR-Cl is a highly crystalline small molecular donor with even stronger intermolecular interaction, low-lying molecular energy levels, and a strong tendency for edge-on orientation.

Multi-functional molecule

Multi-functional molecule

Nematic liquid crystal behaviour

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Small molecule donor in OPVs

Small molecule donor in OPVs

Achieving PCE over 15%

Highly crystalline molecule

Highly crystalline molecule

Low-lying molecular energy levels.

A record-high power conversion efficiency (PCE) of 13.6% for ASM OSCs was achieved using BTR-Cl as electron donor and Y6 as electron acceptor [1]. Later on, 14.7% efficiency of the same donor acceptor BTR-Cl:Y6 system was obtained with a FF of 74.7%, and JSC of 23.66 mA cm-2 at the concentration of 18 mg/ml BTR-Cl:Y6 solution [2]. Further improvement leading to a record PCE of 15.34% was gained when 5 wt% of PC71BM was added in the active layer [3]

Device structure 1: ITO/PEDOT:PSS/BTR-Cl:Y6 (1.6:1)/Phen-NaDPO/Ag

Thickness (nm) VOC (V) JSC (mA cm-2) FF (%) PCE (%)
110 0.86 24.0 64.6 13.61

Device structure 2: ITO/PEDOT:PSS/BTR-Cl:Y6 (1.6:1)/Phen-NaDPO/Ag

Thickness (nm) VOC (V) JSC (mA cm-2) FF (%) PCE (%)
110 0.83 23.66 74.7 14.70

Total concentration of the active layer is 18 mg/ml

Device structure 3: ITO/PEDOT:PSS/BTR-Cl:Y6:5 wt% PC71BM (1.8:1:0.1)/Phen-NaDPO/Ag

Thickness (nm) VOC (V) JSC (mA cm-2) FF (%) PCE (%)
110 0.838 23.75 77.11 15.34

General Information

Full name 5,5'- [[4,8-bis[5-(2-ethylhexyl)-4-chloro-2-thienyl]benzo[1,2-b:4,5-b']dithiophene-2,6-diyl]bis[(3',3''-dihexyl[2,2':5',2''-terthiophene]-5'',5-diyl)methylidyne ]]bis[3-hexyl-2-thioxo-4-thiazolidinone]
Purity 98% (1H NMR)
Synonyms BTR-Cl
Chemical formula C102H126Cl2N2O2S14
Molecular weight 1931.97 g/mol
CAS number 2410661-17-3
HOMO / LUMO HOMO = -5.46 eV LUMO = -3.70 eV [1]
Melting point (DSC) 226°C, 195°C (Tg)
Absorption λmax 580 nm, 624 nm in film
Color/form Dark purple powder/crystals
Solubility/processing solvents Chloroform, chlorobenzene
Classification / Family Benzodithiophene (BDT) derivatives, Heterocyclic five-membered ring, Organic semiconducting materials, Organic Photovoltaics, Small molecule donor, SM-OPVs, Liquid crystal

Chemical Structure

BTR-Cl, OPV small molecule donor
Chemical structure of BTR-Cl, OPV small molecule donor, CAS# 2410661-17-3.

MSDS Documentation

BTR-Cl MSDSBTR-Cl MSDS sheet

Pricing

Batch Quantity Price
M2257A1 100 mg £520
M2257A1 250 mg £1050
M2257A1 500 mg £2000
M2257A1 1 g £3500
M2257A1 5 - 10 g* Please enquire
*For order quantities of 5 - 10 grams, the lead time is 4-6 weeks.

Literature and Reviews

  1. All-Small-Molecule Organic Solar Cells with an Ordered Liquid Crystalline Donor, H. Chen et al., Joule 3, 3034–3047 (2019); DOI: 10.1016/j.joule.2019.09.009.
  2. Delicate Morphology Control Triggers 14.7% Efficiency All-Small-Molecule Organic Solar Cells, H Tang et al., Adv. Energy Mater., 2001076 (2020); DOI: 10.1002/aenm.202001076.
  3. 15.34% Efficiency All-Small-Molecule Organic Solar Cells with Improved Fill Factor Enabled by a Fullerene Additive, D. Hu et al., Energy Environ. Sci., 13, 2134-2141 (2020); DOI: 10.1039/D0EE00714E.
  4. A molecular nematic liquid crystalline material for high-performance organic photovoltaics, K. Sun et al., Nat. Commun., 6:6013 (2014); DOI: 10.1038/ncomms7013.

To the best of our knowledge the information provided here is accurate. The values provided are typical at the time of manufacture and may vary over time and from batch to batch. Products may have minor cosmetic differences (e.g. to the branding) compared to the photos on our website. All products are for laboratory and research and development use only.

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