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Tunable Work Function and Surface Energy in Titanium Nitride (TiN) Thin Films through Quantum Well States
Angus Huang1,2,3, Yee-Heng Teh1, Chin-Hsuan Chen1
1Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan.
ACS Materials Au
|March 17, 2025
Summary
High work function metals like titanium nitride (TiN) are vital for semiconductor devices. This study reveals TiN
Area of Science:
- Materials Science
- Condensed Matter Physics
- Computational Materials Science
Background:
- High work function metals are essential for advanced semiconductor devices, particularly in metal gate structures.
- Titanium nitride (TiN) is a key material for enhancing transistor performance and reliability.
Purpose of the Study:
- To investigate the thickness-dependent work function oscillations in TiN using first-principles calculations.
- To explore the influence of termination and crystallographic orientation on the TiN work function.
Main Methods:
- First-principles calculations (e.g., Density Functional Theory).
- Analysis of quantum well state effects on material properties.
- Surface and interface characterization of TiN.
Main Results:
- The work function of TiN oscillates with film thickness due to quantum well state effects.
- Significant enhancement of the work function up to 8.04 eV was observed for N-terminated TiN(111) at 5 ML thickness.
- Work function is dependent on surface termination and crystallographic orientation.
Conclusions:
- Quantum well states significantly impact the work function of thin TiN films.
- Tailoring surface termination and orientation offers a pathway to achieve ultra-high work functions in TiN.
- Findings provide critical data for designing next-generation semiconductor devices with improved performance.
