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Tunable Transparent Conductors Based on SnO2: Theoretical and Experimental Studies of Codoping
Wenjing Qian1, Xianghui Feng1, Yanxue Wang1
1UCL Institute for Materials Discovery, University College London, Malet Place, London WC1E 7JE, United Kingdom.
ACS Omega
|December 23, 2024
Summary
This study demonstrates codoping tin dioxide (SnO2) with various elements to create advanced transparent conducting oxides (TCOs). Computational design and experimental validation achieved tunable electronic properties for high-performance, indium-free TCO applications.
Area of Science:
- Materials Science
- Solid State Physics
- Computational Materials Science
Background:
- Transparent conducting oxides (TCOs) are essential in electronics, requiring both high transparency and conductivity.
- Tin dioxide (SnO2) is a promising, cost-effective, and stable host material for TCOs.
- Tailoring electronic states for n-type or p-type conductivity is crucial for TCO development.
Purpose of the Study:
- To investigate the codoping of SnO2 with various elements using hybrid-exchange density functional theory (DFT) calculations.
- To experimentally validate the computational predictions for tunable electronic properties.
- To explore the potential of codoped SnO2 as an alternative to indium-based TCOs.
Main Methods:
- Hybrid-exchange density functional theory (DFT) calculations were performed on codoped SnO2 systems.
- Experimental validation involved fabricating and characterizing thin films of codoped SnO2.
- Systematic variation of dopant concentrations (donors like Ta/Nb and acceptors like Al/Ga) was employed.
Main Results:
- First-principles calculations predicted controllable n-type and p-type conductivity in codoped SnO2.
- Experimental results confirmed the tunability of electronic states by adjusting dopant concentrations.
- Fabricated thin films exhibited low sheet resistance (down to ~450 Ω/□) and high optical transparency (>80%).
Conclusions:
- Codoping circumvents charge neutrality issues, enabling efficient processing of integrated circuits with both p-type and n-type transistors.
- Codoped SnO2 demonstrates good lattice matching for p-n junctions, crucial for electronic devices.
- Computational material design combined with experimental validation offers a promising pathway for discovering cost-effective, high-performance, indium-free TCOs.
