Exciton-polaron quenching in organic thin-film transistors studied by fluorescence lifetime imaging microscopy

Per Baunegaard With Jensen, Till Leißner, Andreas Osadnik, Arne Lützen, Jonathan R. Brewer, Jakob Kjelstrup-Hansen

Publikation: Konferencebidrag uden forlag/tidsskriftPosterForskning


Organic semiconductors show great potential in electronic and optical applications. However, a major challenge is the degradation of the semiconductor materials that cause a reduction in device performance. Here, we present our investigations of Organic Thin Film Transistors (OTFT) based on the material 5,5-bis(naphthyl)-2,20-bithiophene (NaT2). These types of OTFT have previously been shown to have light emitting properties. Fluorescence Lifetime Imaging Microscopy (FLIM) has been used to investigate the exciton-polaron quenching in biased OTFTs. A clear reduction in fluorescence lifetime that correlates with the local charge density indicates a pronounced exciton quenching by the injected charges. Subsequent FLIM measurements on previously biased OTFT devices show a general decrease in fluorescence lifetime suggesting degradation of the organic semiconductor. This is correlated with the results from electrical transport measurements that yielded the hole mobility and threshold voltage.
Publikationsdato29. sep. 2015
StatusUdgivet - 29. sep. 2015
BegivenhedXIV Brazil Materials Research Society Meeting - Rio de Janeiro, Brasilien
Varighed: 27. sep. 20151. okt. 2015


KonferenceXIV Brazil Materials Research Society Meeting
ByRio de Janeiro