Prosiectau fesul blwyddyn
Crynodeb
This study describes the utilization of near edge X‐ray absorption fine structure (NEXAFS) to investigate the hole transporting material (HTM) 2,2ʹ,7,7ʹ‐tetrakis(N, N‐di‐p‐methoxyphenylamine)‐ 9,9ʹ‐spirobifluorene (Spiro‐OMeTAD) and its most common dopants, lithium bis‐(trifluoromethylsulfonyl) imide (LiTFSI), 4‐tert‐butylpiridine (tBP), and 2,3,5,6‐tetrafluoro‐7,7,8,8‐tetracyanoquinodimethane (F4‐TCNQ). By changing the angle of the sample with respect to the beam, the orientation of the molecules on the surface can be observed. The data suggest that it is difficult to determine any orientational preference for Spiro‐OMeTAD deposited on a surface due to the 3D propeller‐like geometry of this molecule. Both doped and undoped samples show thermal stability beyond the glass transition temperature of the molecules. Significant changes to the Spiro‐OMeTAD spectra are observed with the addition of the dopants, in particular the C K‐edge. Differences are also observed in the valence band spectra when dopants are added. It is also demonstrated how the doping combination of LiFTSI with tBP and, F4‐TCNQ act as p‐type dopants by altering the position of the HOMO levels. The F4‐TCNQ induces a larger change in the HOMO levels when compared to the LiTFSI and tBP. These results are important to increase the understanding of Spiro‐OMeTAD and the effect dopants have on this material for next generation solar cells.
Iaith wreiddiol | Saesneg |
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Rhif yr erthygl | 2200045 |
Nifer y tudalennau | 7 |
Cyfnodolyn | Advanced Physics Research |
Dyddiad ar-lein cynnar | 22 Ebr 2023 |
Dynodwyr Gwrthrych Digidol (DOIs) | |
Statws | E-gyhoeddi cyn argraffu - 22 Ebr 2023 |
Ôl bys
Gweld gwybodaeth am bynciau ymchwil 'Investigating the Molecular Orientation and Thermal Stability of Spiro‐OMeTAD and its Dopants by Near Edge X‐Ray Absorption Fine Structure'. Gyda’i gilydd, maen nhw’n ffurfio ôl bys unigryw.Prosiectau
- 1 Wedi Gorffen
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SPARC II - Solar Photovoltaic Academic Research
Evans, A. (Prif Ymchwilydd)
01 Ion 2016 → 31 Maw 2023
Prosiect: Ymchwil a ariannwyd yn allanol