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Product Code M531-50g
Price £190 ex. VAT

LiTFSI, high purity p-dopant

Used to enhance conductivity and hole mobility of Spiro-OMeTAD for PSCs

Overview | Specifications  | Literature and Reviews

Lithium bis(trifluoromethylsulphonyl)imide (LiTFSI), CAS number 90076-65-6, is normally used as a p-dopant to enhance the conductivity and hole mobility of the Spiro-OMeTAD for perovskite solar cells. It is believed that the function of LiTFSI in PSCs is similar to that in solid-state dye-sensitised solar cells [2].

Some of the lithium ions can intercalate into TiO2 to downshift its conduction band, resulting in a higher photocurrent. The rest of the lithium ions can react with oxygen and Spiro-OMeTAD to facilitate the generation of oxidised Spiro-OMeTAD, while the large anionTFSI¯, can stabilise the oxidized Spiro-OMeTAD as the counterion [1, 2].

It is also essential to add Lithium bis(trifluoromethanesulfonyl)imide to the hole transport materials (HTM) to get a higher conductivity.

General Information

CAS number 90076-65-6
Chemical formula C2F6LiNO4S2
Molecular weight 287.09 g/mol
  • Lithium bis(trifluoromethanesulfonyl)imide
  • Bis(trifluoromethane)sulfonimide lithium salt
Classification / Family Dye Sensitised Solar Cells (DSSC) ,  Light-emitting Diodes, Perovskite HTL Materials, Electrolyte materials.
Storage Product is hygroscopic. Store under inert atmosphere or in a dessicator.

Product Details

Purity 99.99%
Boiling point 234-238 °C (lit.)
Colour White powder/crystals

Chemical Structure

chemical structure of LiTFSI
Chemical structure of Lithium bis(trifluoromethanesulfonyl)imide (LiTFSI)
Device structure FTO/c-TiO2/mp-Al2O3/CH3NH3PbBr3−xClx/CBP/Au [3] FTO/c-TiO2/mp-Al2O3/CH3NH3PbBr3−xClx/ CBP:(TBP:LiTFSI, 10% wt)/Au
Jsc (mA cm-2) 1.3 4.0
Voc (V) 1.4 1.5
FF (%) 24 46
PCE (best) 0.44 2.7

Characterisation (NMR)

19F NMR of Lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) in d6-DMSO (see full version)

Literature and Reviews

  1. Spectrum-Dependent Spiro-OMeTAD Oxidization Mechanism in Perovskite Solar Cells, S Wang et al., ACS Appl. Mater. Interfaces 7, 24791-24798 (2015). DOI: 10.1021/acsami.5b07703.
  2. Lithium salts as “redox active” p-type dopants for organic semiconductors and their impact in solid-state dye-sensitized solar cells, A. Abate et al., Phys. Chem. Chem. Phys., 15, 2572-2579 (2013). DOI: 10.1039/C2CP44397J.
  3. Chloride Inclusion and Hole Transport Material Doping to Improve Methyl Ammonium Lead Bromide Perovskite-Based High Open-Circuit Voltage Solar Cells, E. Edri et al., J. Phys. Chem. Lett., 5 (3), 429–433 (2014), DOI: 10.1021/jz402706q.
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