Electronic properties of semiconducting naphthalene bisimide derivatives – ultraviolet photoelectron spectroscopy versus electrochemistry
PBN-AR
Instytucja
Wydział Chemiczny (Politechnika Warszawska)
Informacje podstawowe
Główny język publikacji
en
Czasopismo
Electrochimica Acta
ISSN
0013-4686
EISSN
Wydawca
Pergamon
DOI
Rok publikacji
2013
Numer zeszytu
Strony od-do
13-17
Numer tomu
96
Liczba arkuszy
0.5
Autorzy
Pozostali autorzy
+ 3
Słowa kluczowe
en
Ultra-violet Photoelectron Spectroscopy, Cyclic voltammetry, Naphthalene bisimides
Streszczenia
Język
en
Treść
Key parameters for organic semiconductors used as active layers in organic electronic devices are: solution processability, charge carriers mobility as well as the electron affinity (EA) and the ionization potential (IP) which determine their redox properties and by consequence their air stability. The purpose of the present work was to investigate the influence of different substituents at imide nitrogen atom (alkylaryl, thienylene and triarylamine) and at naphthalene core (triarylamine) on the IP and EA values in recently synthesized naphthalene bisimide derivatives, tested as promising semiconductors for flexible n-channel or ambipolar organic field effect transistors (OFETs). The ionization potentials were determined by Ultra-violet Photoelectron Spectroscopy (UPS) for thin semiconductor films evaporated in ultra-high vacuum. The values obtained by photoelectron spectroscopy were compared with the ones determined from electrochemical investigations of the semiconductors dissolved in an electrolyte solution. Using cyclic voltammetry the IPs was estimated from the onset of the first oxidation peak whereas EAs from the onset of the first reduction peak. In cases where it was not possible to record the oxidation wave in the electrolyte electrochemical window, the IPs values were calculated by subtracting the energy of the spectroscopically (UV–vis–NIR) determined band gap from the EA values and changing the sign. A good correlation between the spectroscopic (UPS) and electrochemical data was found. © 2013 Elsevier Ltd.
Inne
System-identifier
WUT403010
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