Abstract
Electric conductivity and ultraviolet photoelectron spectra (UPS) of potassium doped 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) were measured. The conductivity of potassium doped PTCDA film jumps up to 0.1 Scm -1 from around 10 -6 Scm -1 of pristine one. Potassium doping to PTCDA also brings change in the upper valence band UPS; spectral onset moves closer to the Fermi level (E F ). These phenomena can be attributed to electron transfer from potassium to PTCDA, which is confirmed by MNDO molecular orbital calculation.
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