Titanyl phthalocyanine ambipolar thin film transistors making use of carbon nanotube electrodes.
The capability of efficiently injecting charge carriers into organic films and finely tuning their morphology and structure is crucial to improve the performance of organic thin film transistors (OTFTs). In this work, we investigate OTFTs employing carbon nanotubes (CNTs) as the source-drain electrodes and, as the organic semiconductor, thin films of titanyl phthalocyanine (TiOPc) grown by supersonic molecular beam deposition (SuMBD). While CNT electrodes have shown an unprecedented ability to improve charge injection in OTFTs, SuMBD is an effective technique to tune film morphology and structure. Varying the substrate temperature during deposition, we were able to grow both amorphous (low substrate temperature) and polycrystalline (high substrate temperature) films of TiOPc. Regardless of the film morphology and structure, CNT electrodes led to superior charge injection and transport performance with respect to benchmark Au electrodes. Vacuum annealing of polycrystalline TiOPc films with CNT electrodes yielded ambipolar OTFTs.
IMEM CNR Institute of Materials for Electronics and Magnetism, Parco Area delle Scienze 37/A, 43124, Parma, Italy.
Nicola
N
Coppedè
Irina
I
Valitova
Farzaneh
F
Mahvash
Giuseppe
G
Tarabella
Paolo
P
Ranzieri
Salvatore
S
Iannotta
Clara
C
Santato
Richard
R
Martel
Fabio
F
Cicoira
D004566:Electrodes; D007211:Indoles / Q000737:chemistry*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D009942:Organometallic Compounds / Q000737:chemistry*; D012666:Semiconductors; D013696:Temperature; D014173:Transistors, Electronic
D007211:Indoles; D037742:Nanotubes, Carbon; D009942:Organometallic Compounds; C545058:titanyl phthalocyanin