Electronic states and molecular orientation of ITIC film

Ying-Ying Du; De-Qu Lin; Guang-Hua Chen; Xin-Yuan Bai; Long-Xi Wang; Rui Wu; Jia-Ou Wang; Hai-Jie Qian; Hong-Nian Li

doi:10.1088/1674-1056/27/8/088801

Electronic states and molecular orientation of ITIC film

Applied Physics 2018-08-29 v1 Other Condensed Matter

Authors: Ying-Ying Du , De-Qu Lin , Guang-Hua Chen , Xin-Yuan Bai , Long-Xi Wang , Rui Wu , Jia-Ou Wang , Hai-Jie Qian , Hong-Nian Li

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Abstract

ITIC is the milestone of non-fullerene small molecule acceptors used in organic solar cells. We have studied the electronic states and molecular orientation of ITIC film using photoelectron spectroscopy and X-ray absorption spectroscopy. The negative integer charge transfer energy level is determined to be 4.00 plus or minus 0.05 eV below the vacuum level, and the ionization potential is 5.75 plus or minus 0.10 eV. The molecules predominantly adopt the face-on orientation on inert substrates as long as the surfaces of the substrates are not too rough. These results provide physical understanding of the high performance of ITIC-based solar cells, also afford implications to design more advanced photovoltaic small molecules.

Keywords

itic organic solar cells electronic states molecular orientation photoelectron spectroscopy x-ray absorption spectroscopy

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@article{arxiv.1805.02866,
  title  = {Electronic states and molecular orientation of ITIC film},
  author = {Ying-Ying Du and De-Qu Lin and Guang-Hua Chen and Xin-Yuan Bai and Long-Xi Wang and Rui Wu and Jia-Ou Wang and Hai-Jie Qian and Hong-Nian Li},
  journal= {arXiv preprint arXiv:1805.02866},
  year   = {2018}
}

Electronic states and molecular orientation of ITIC film

Abstract

Keywords

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