Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/15299
Title: Improved performance of bottom-contact organic thin-film transistor using Al doped HfO2 gate dielectric
Authors: Tang, WM 
Aboudi, U
Provine, J
Howe, RT
Wong, HSP
Keywords: Bottom-contact
Copper phthalocyanine (CuPc)
Gate dielectric
High-k
Organic thin-film transistor (OTFT)
Issue Date: 2014
Publisher: Institute of Electrical and Electronics Engineers
Source: IEEE transactions on electron devices, 2014, v. 61, no. 7, 6824766, p. 2398-2403 How to cite?
Journal: IEEE transactions on electron devices 
Abstract: Aluminum doped HfO2 (HfAlO) prepared by atomic layer deposition is investigated as gate dielectric for low-voltage organic thin-film transistors (OTFTs). The HfAlO film exhibits a low leakage current density of 4.92×10?8 A/cm2 at-3 MV/cm, which is 70% smaller than its HfO2 counterpart. In addition, copper phthalocyanine (CuPc) OTFT with HfAlO dielectric has an average mobility μ (2.58±0.32×10?3 cm2/Vs) increased by 58%, sub-threshold slope SS (0.9 ±0.11 V/decade) decreased by 11%, and ON/OFF ratio ION/IOFF (3.1 ±1.3 ±103) increased by 86% as compared with those with HfO2 as gate dielectric (μ = 1.63 ±0.27 ±10?3 cm2/Vs; SS = 1.01 ±0.1 V/decade; ION/IOFF = 1.7 ±0.77 ±103). All these could be ascribed to the inclusion of Al in the HfO2 film, which increases the conduction band offset and the bandgap and improves the dielectric and interface quality. The temperature effect on the performance of OTFTs is also investigated..
URI: http://hdl.handle.net/10397/15299
ISSN: 0018-9383
EISSN: 1557-9646
DOI: 10.1109/TED.2014.2325042
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