What question did this study set out to answer?

The main aim is to develop high-performance 2D dielectrics using γ-Bi2O3 with unidirectional orientation.

February 8, 2026Nano Letters

Step-Edge-Guided Growth of Single-Crystalline γ-Bi 2 O 3 with Unidirectional Orientation as a High-κ Dielectric for 2D Transistors

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Research demonstrates improved dielectric properties in γ-Bi2O3 films, suggesting suitability for 2D transistors.

The main aim is to develop high-performance 2D dielectrics using γ-Bi2O3 with unidirectional orientation.
Used chemical vapor deposition to grow γ-Bi2O3 films on C/M sapphire substrate
Controlled growth with a miscut angle of 0.2 ± 0.05°
Characterized dielectric properties including dielectric constant and leakage current density
Achieved a high dielectric constant of 39.38
Demonstrated an ultralow leakage current density of 2.5 × 10^-5 A cm^-2
Integrated γ-Bi2O3 into transistors showed an on/off ratio exceeding 10^6
Obtained a subthreshold swing of 80 mV dec^-1 and small hysteresis of 19 mV
Exhibited excellent thermal stability from 300-450 K and environmental stability over 4 months

Hu et al. (2026) studied this question.

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