研究目的
To improve the light-induced instability of oxide thin film transistors by praseodymium doping, enhancing bias illumination stability.
研究成果
Pr doping in IZO-TFTs significantly enhances light-induced instability resistance by introducing acceptor-like trap states that suppress photo-generated carriers. This provides a new strategy for stable transparent electronics, demonstrated with a functional AMOLED display prototype.
研究不足
The study is limited to specific Pr concentrations and IZO-based materials; other oxide semiconductors may require further investigation. The trade-off between TFT performance (mobility and SS degradation) and light stability needs optimization. The mechanism involves hypothetical models that are not fully validated.
1:Experimental Design and Method Selection:
Bottom-gate staggered structure TFTs were fabricated with Pr-doped indium zinc oxide (PrIZO) as the channel layer using RF magnetron co-sputtering. Various Pr concentrations (0 to 2.98 at%) were tested to analyze effects on performance and stability under illumination.
2:98 at%) were tested to analyze effects on performance and stability under illumination. Sample Selection and Data Sources:
2. Sample Selection and Data Sources: PrIZO thin films were deposited on quartz substrates and patterned for TFT fabrication. Electrical, optical, and chemical characterizations were performed.
3:List of Experimental Equipment and Materials:
Equipment includes RF magnetron co-sputtering system, DC sputtering, PECVD, probe station, Agilent B1500A semiconductor parameter analyzer, XRD (X'Pert-PRO, PANalytical), Hall system (MMR H50), UV-vis spectroscopy (UV-3600, Shimadzu), XPS (ESCALAB 250i), PL spectrometer (Edinburgh FLS 980), micro-PCD system (KOBELCO LTA-1620SP). Materials include Mo, SiO2, Si3N4, IZO and PrIZO ceramic targets (99.99% purity), Ar and O2 gases.
4:99% purity), Ar and O2 gases. Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Fabrication involved depositing gate metal and insulator, co-sputtering PrIZO channel, patterning, depositing source/drain electrodes, passivation, and annealing. Measurements included transfer characteristics, photo-response under LED illumination, NBIS tests, and various spectroscopic analyses.
5:Data Analysis Methods:
Data were analyzed using standard methods for mobility, SS, trap density extraction, XPS peak fitting, Tauc plot for band gap, and micro-PCD for carrier dynamics.
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semiconductor parameter analyzer
B1500A
Agilent
Device characterization and electrical measurements
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X-ray diffractometer
X'Pert-PRO
PANalytical
Investigation of crystal structures of thin films
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UV-vis spectroscopy
UV-3600
Shimadzu
Measurement of transmittances of thin films
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luminescence spectrometer
FLS 980
Edinburgh
Measurement of photoluminescence spectra
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Hall system
H50
MMR
Hall measurements in Van der Pauw configuration
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X-ray photoelectron spectroscopy
ESCALAB 250i
Analysis of chemical compositions and valence band
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micro-PCD measurement system
LTA-1620SP
KOBELCO Research Institute
Investigation of photoconductivity responses
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