FREE shipping to on qualifying orders when you spend or more, processed by Ossila BV. All prices ex. VAT. Qualifying orders ship free worldwide! Fast, secure, and backed by the Ossila guarantee. It looks like you are visiting from , click to shop in or change country. Orders to the EU are processed by our EU subsidiary.

It looks like you are using an unsupported browser. You can still place orders by emailing us on info@ossila.com, but you may experience issues browsing our website. Please consider upgrading to a modern browser for better security and an improved browsing experience.


Product Code M531-50g
Price $238 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
Synonyms
  • 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 LiTFSI
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.
Return to the top