LiTFSI
Lithium bis(trifluoromethylsulphonyl)imide (LiTFSI) 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
| 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)
Literature and Reviews
- 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.
- 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.
- 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.
- Sequential deposition as a route to high-performance perovskite-sensitized solar cells, J. Burschka et al., Nature, 499, 316-319 (2013). doi:10.1038/nature12340.
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