Oxide TFT Interface Engineering for Stable PBTS Under Thermal Processing
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Solution Overview
Problem
Metal oxide thin-film transistors in electronic devices face poor positive-bias-temperature stress (PBTS) performance due to multiple heating and annealing processes during manufacturing, affecting the reliability of these devices.
Innovation Solution
An electronic device structure is developed with a substrate, buffer layer, oxide semiconductor layer, and specific insulating layers, where the intensity of SiN- at certain interfaces is optimized using TOF-SIMS analysis to enhance the stability of the PBTS performance, including N2 plasma treatment and layered structures to improve conductivity and reduce defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple heating and annealing processes are applied to metal oxide thin-film transistors during manufacturing, then the transistor structure is formed, but the positive-bias-temperature stress (PBTS) performance deteriorates
Solution Approach 1:
The patent applies preliminary action by performing N2 plasma treatment on the oxide semiconductor layer surface before subsequent manufacturing steps. This pre-treatment passivates surface states and reduces defects that would otherwise deteriorate during heating and annealing processes, thereby maintaining PBTS performance throughout the manufacturing sequence.
Solution Approach 2:
The patent changes the chemical state of the oxide semiconductor layer by introducing SiN- species through plasma treatment. This parameter change modifies the surface chemistry to reduce oxygen vacancies and improve interface quality, which stabilizes the transistor against PBTS degradation during subsequent thermal processing.
2Reliability
If N2 plasma treatment is applied to the oxide semiconductor layer surface, then the PBTS performance stability is improved, but the manufacturing process complexity increases
Solution Approach 1:
The patent merges the N2 plasma treatment step with the existing manufacturing process sequence by integrating it between the oxide semiconductor layer formation and the gate electrode fabrication. This consolidation approach incorporates the reliability-improving treatment without requiring separate dedicated process equipment or additional process modules.
3Reliability
If the intensity of SiN- at the interface between the oxide semiconductor layer and insulating layer is increased, then the PBTS performance is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent uses N2 plasma as an intermediary treatment to introduce SiN- species at the oxide semiconductor layer interface. This intermediary process achieves controlled modification of the interface chemistry without requiring direct deposition or complex in-situ control mechanisms, thereby improving PBTS performance while maintaining manageable manufacturing precision requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution significantly improves the stability and reliability of the PBTS performance of thin-film transistors, enhancing the overall performance and reliability of electronic devices by optimizing SiN- bonding and conductivity.
Implementation Method 1
performing an N2 plasma treatment on a surface of the oxide semiconductor layer
Data Source
AI summary
An electronic device is provided. The electronic device includes a substrate, a buffer layer, an oxide semiconductor layer, a first insulating layer, and a gate electrode. The buffer layer is disposed on the substrate. The oxide semiconductor layer is disposed on the buffer layer and has a first part and a second part adjacent to the first part. The first insulating layer is disposed on the oxide semiconductor layer. The gate electrode is disposed on the first insulating layer and overlapped with the first part of the oxide semiconductor layer. Moreover, an intensity of SiN— at an interface between the first part and the first insulating layer is greater than an intensity of SiN— at an interface between the first part and the buffer layer in a spectrum measured by TOF-SIMS. A method of manufacturing an electronic device is also provided.