Proceedings of nanoGe Fall Meeting19 (NFM19)
Publication date: 18th July 2019
The hole transporting material (HTM) plays an important role in organic solar cells efficiency and longevity. The demand of new, cheap and more efficient HTM‘s requires to find out the right molecular structure and synthesis procedures. Testing all these HTM‘s in the real device would take a lot of effort and time, however, the evaluation of charge transport properties by the xerographic time-of-flight (XTOF) and ionisation potential by photoelectron emission spectroscopy in air, in bulk layer, are fast and informative methods. These methods allows to determine two important properties of HTM‘s: charge carries mobility and HOMO energy level. All investigated HTM’s were enamines with 9,9`-disubstituted fluorene in the centre of the molecule possessing different aliphatic chains or benzyl radicals. Similar hole mobility was determined for all HTM’s, at electric field of 106Vcm−1: 2.8 – 3.8x10-3 cm2/Vs. Determined mobility values are well compared with well known spiro-OMeTAD HTM, which had hole mobility of 1x10-3 cm2/Vs, at electric field of 106V cm−1. Values of ionisation potential varied from 4.9-5.03 eV and was similar to spiro-OMeTAD – 5.00 eV.
This project has received funding from the Research Council of Lithuania (LMTLT), agreement No MIP17-70 .
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