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Double Beneficial Role of Fluorinated Fullerene Dopants on Organic Thin-Film Transistors: Structural Stability and Improved Performance

AuthorsBabuji, Adara; Temiño, Inés; Pérez Rodríguez, Ana ; Solomeshch, Olga; Tessler, Nir; Vila, Maria; Li, Jinghai; Mas Torrent, Marta ; Ocal, Carmen ; Barrena, Esther
contact doping
organic semiconductors
Issue Date9-Jun-2020
PublisherAmerican Chemical Society
CitationACS Applied Materials and Interfaces: 10.1021/acsami.0c06418 (2020)
AbstractThe present work assesses improved carrier injection in organic field-effect transistors by contact doping and provides fundamental insight into the multiple impacts that the dopant/semiconductor interface details have on the long-term and thermal stability of devices. We investigate donor [1]benzothieno[3,2-b]-[1]benzothiophene (BTBT) derivatives with one and two octyl side chains attached to the core, therefore constituting asymmetric (BTBT-C8) and symmetric (C8-BTBT-C8) molecules, respectively. Our results reveal that films formed out of the asymmetric BTBT-C8 expose the same alkyl-terminated surface as the C8-BTBT-C8 films do. In both cases, the consequence of depositing fluorinated fullerene (C60F48) as a molecular p-dopant is the formation of C60F48 crystalline islands decorating the step edges of the underlying semiconductor film surface. We demonstrate that local work function changes along with a peculiar nanomorphology lead to the double beneficial effect of lowering the contact resistance and providing long-term and enhanced thermal stability of the devices.
Publisher version (URL)http://dx.doi.org/10.1021/acsami.0c06418
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