Deep-ultraviolet transparent conducting SrSnO3 via heterostructure design
Fengdeng Liu1, Zhifei Yang1,2, David Abramovitch3
1Department of Chemical Engineering and Materials Science, University of Minnesota-Twin Cities, Minneapolis, MN 55455, USA.
Science Advances
|November 1, 2024
Summary
Advancements in ultrawide bandgap (UWBG) semiconductors are crucial for high-power electronics. This study demonstrates a thin heterostructure achieving high conductivity and transparency for deep-ultraviolet (DUV) applications.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Semiconductor Physics
Background:
- Ultrawide bandgap (UWBG) semiconductors are essential for next-generation high-power electronics and deep-ultraviolet (DUV) optoelectronics.
- Achieving high conductivity and transparency simultaneously in UWBG materials presents a significant challenge.
Purpose of the Study:
- To explore the potential of thin heterostructure design for enhancing conductivity and transparency in UWBG semiconductors.
- To investigate phonon-limited transport behavior and carrier modulation in a SrSnO3-based heterostructure.
Main Methods:
- Fabrication of a SrSnO3/La:SrSnO3/GdScO3 (110) heterostructure.
- Application of electrostatic gating to modulate carrier density and separate charge carriers.
- Characterization of electrical transport properties and optical transparency.
Main Results:
- Achieved carrier density modulation from 10^18 to 10^20 cm^-3.
- Observed room temperature mobilities ranging from 40 to 140 cm^2 V^-1 s^-1.
- Demonstrated 85% optical transparency at 300 nm wavelength.
Conclusions:
- Thin heterostructure design effectively facilitates high conductivity and transparency in UWBG semiconductors.
- Electrostatic gating enables phonon-limited transport and significant carrier modulation.
- The developed material shows great promise for transparent UWBG semiconductor applications in the DUV regime.
