Journal
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
Volume 218, Issue 19, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssa.202100330
Keywords
carrier mobilities; organic amorphous semiconductors; temperature dependence; time of flight method
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The hole mobility of an organic semiconductor film changes with different film formation processes, with activation energies varying for vacuum-deposited film, slowly cooled-melted film, and rapidly cooled-melted film. This indicates that organic semiconductor thin films formed by different methods have different molecular aggregation states.
The hole mobility of an organic semiconductor film that consists of N,N'-di (1-naphthyl)-N,N'-diphenyl-benzidine (alpha-NPD) is evaluated at various film formation processes, such as vacuum deposition and capillary injection. The mobility varies with the film formation process. From the temperature dependence of mobility, the Poole-Frenkel model and disorder model are discussed. From the analysis based on the Poole-Frenkel model, activation energies of the vacuum-deposited film, the slowly cooled-melted film, and the rapidly cooled-melted film are 0.28, 0.20, and 0.40 eV, respectively. This result suggests that organic semiconductor thin films formed by different film formation methods have different molecular aggregation states.
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