Charge injection in metal/organic/metal structures with ZnO:Al/organic interface modified by Zn1-xMgxO:Al layer
PBN-AR
Instytucja
Instytut Chemii Fizycznej Polskiej Akademii Nauk
Źródłowe zdarzenia ewaluacyjne
Informacje podstawowe
Główny język publikacji
en
Czasopismo
ORGANIC ELECTRONICS
ISSN
1566-1199
EISSN
Wydawca
ELSEVIER SCIENCE BV
DOI
URL
Rok publikacji
2015
Numer zeszytu
Strony od-do
135-142
Numer tomu
25
Identyfikator DOI
Liczba arkuszy
Słowa kluczowe
en
Charge injection
Zinc oxide
Atomic layer deposition
Streszczenia
Język
en
Treść
Aluminum-doped zinc oxide (ZnO:Al, AZO) electrodes were covered with very thin (similar to 6 nm) Zn1-xMgxO:Al (AMZO) layers grown by atomic layer deposition. They were tested as hole blocking/electron injecting contacts to organic semiconductors. Depending on the ALD growth conditions, the magnesium content at the film surface varied from x = 0 to x = 0.6. Magnesium was present only at the ZnO:Al surface and subsurface regions and did not diffuse into deeper parts of the layer. The work function of the AZO/AMZO (x = 0.3) film was 3.4 eV (based on the ultraviolet photoelectron spectroscopy). To investigate carrier injection properties of such contacts, single layer organic structures with either pentacene or 2, 4-bis[4-(N,N-diisobutylamino)-2,6-dihydroxyphenyl] squaraine layers were prepared. Deposition of the AMZO layers with x = 0.3 resulted in a decrease of the reverse currents by 1-2 orders of magnitude and an improvement of the diode rectification. The AMZO layer improved hole blocking/electron injecting properties of the AZO electrodes. The analysis of the current-voltage characteristics by a differential approach revealed a richer injection and recombination mechanisms in the structures containing the additional AMZO layer. Among those mechanisms, monomolecular, bimolecular and superhigh injection were identified.
Cechy publikacji
ORIGINAL_ARTICLE
Inne
System-identifier
698756
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