Controlling energy level positions in hole conducting molecular films by additives

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Controlling energy level positions in hole conducting molecular films by additives. / Lindblad, Rebecka; Oscarsson, Johan; Fredin, Kristofer; Eriksson, Susanna K.; Siegbahn, Hans; Johansson, Erik M.J.; Rensmo, Håkan.

I: Journal of Electron Spectroscopy and Related Phenomena, Vol. 224, 01.04.2018, s. 100-106.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Harvard

Lindblad, R, Oscarsson, J, Fredin, K, Eriksson, SK, Siegbahn, H, Johansson, EMJ & Rensmo, H 2018, 'Controlling energy level positions in hole conducting molecular films by additives', Journal of Electron Spectroscopy and Related Phenomena, vol. 224, s. 100-106. https://doi.org/10.1016/j.elspec.2017.03.009

APA

Lindblad, R., Oscarsson, J., Fredin, K., Eriksson, S. K., Siegbahn, H., Johansson, E. M. J., & Rensmo, H. (2018). Controlling energy level positions in hole conducting molecular films by additives. Journal of Electron Spectroscopy and Related Phenomena, 224, 100-106. https://doi.org/10.1016/j.elspec.2017.03.009

CBE

MLA

Vancouver

Author

Lindblad, Rebecka ; Oscarsson, Johan ; Fredin, Kristofer ; Eriksson, Susanna K. ; Siegbahn, Hans ; Johansson, Erik M.J. ; Rensmo, Håkan. / Controlling energy level positions in hole conducting molecular films by additives. I: Journal of Electron Spectroscopy and Related Phenomena. 2018 ; Vol. 224. s. 100-106.

RIS

TY - JOUR

T1 - Controlling energy level positions in hole conducting molecular films by additives

AU - Lindblad, Rebecka

AU - Oscarsson, Johan

AU - Fredin, Kristofer

AU - Eriksson, Susanna K.

AU - Siegbahn, Hans

AU - Johansson, Erik M.J.

AU - Rensmo, Håkan

PY - 2018/4/1

Y1 - 2018/4/1

N2 - Hard X-ray photoelectron spectroscopy (HAXPES) has been used to study the bulk electronic structure of thin molecular films of the organic compounds 2,2′,7,7′-tetrakis (N,N’-di-p-methoxyphenyl-amine)-9,9’-spiro-bifluorene (spiro-OMeTAD), 4-(diethylamino)-benzaldehyde-1,1)-diphenyl-hydrazone (DEH) and poly(3-hexylthiophene) (P3HT). Molecular layers of these compounds are hole conducting, a property that for example has been used in different solar cell configurations. The function of such a device benefits from the inclusion of additives such as Li-TFSI, or dopants such as Co-complexes, into the molecular layer. Here we report on effects of adding Li-TFSI to DEH and P3HT as observed by photoelectron spectroscopy and we compare with results on the spiro-OMeTAD hole conductor. It can be concluded that the Li-salt causes a shift of the Fermi level in DEH and P3HT towards the HOMO resulting in a p-doping of the molecular material. Similar shifts of the Fermi level could also be observed when adding different Co(+III) complexes to the Spiro-OMeTAD hole conductor, indicating means for more controlled doping.

AB - Hard X-ray photoelectron spectroscopy (HAXPES) has been used to study the bulk electronic structure of thin molecular films of the organic compounds 2,2′,7,7′-tetrakis (N,N’-di-p-methoxyphenyl-amine)-9,9’-spiro-bifluorene (spiro-OMeTAD), 4-(diethylamino)-benzaldehyde-1,1)-diphenyl-hydrazone (DEH) and poly(3-hexylthiophene) (P3HT). Molecular layers of these compounds are hole conducting, a property that for example has been used in different solar cell configurations. The function of such a device benefits from the inclusion of additives such as Li-TFSI, or dopants such as Co-complexes, into the molecular layer. Here we report on effects of adding Li-TFSI to DEH and P3HT as observed by photoelectron spectroscopy and we compare with results on the spiro-OMeTAD hole conductor. It can be concluded that the Li-salt causes a shift of the Fermi level in DEH and P3HT towards the HOMO resulting in a p-doping of the molecular material. Similar shifts of the Fermi level could also be observed when adding different Co(+III) complexes to the Spiro-OMeTAD hole conductor, indicating means for more controlled doping.

KW - HAXPES

KW - Mesoscopic solar cells

KW - P3HT

KW - Spiro-OMeTAD

U2 - 10.1016/j.elspec.2017.03.009

DO - 10.1016/j.elspec.2017.03.009

M3 - Article

VL - 224

SP - 100

EP - 106

JO - Journal of Electron Spectroscopy and Related Phenomena

JF - Journal of Electron Spectroscopy and Related Phenomena

SN - 0368-2048

ER -