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Electronic states and molecular orientation of ITIC film

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arxiv 1805.02866 v1 pith:Q2BDC7Y4 submitted 2018-05-08 physics.app-ph cond-mat.other

Electronic states and molecular orientation of ITIC film

classification physics.app-ph cond-mat.other
keywords iticorientationcellselectronicfilmlevelminusmolecular
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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