Thin-Film Transistor Blue Laser Annealing for Silicon Crystallization
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Solution Overview
Problem
Current manufacturing methods for thin film transistors are complex and costly, and they struggle to maintain high performance due to limitations in semiconductor layer crystallization and dehydrogenation processes.
Innovation Solution
A manufacturing method involving blue laser annealing is used to form a semiconductor layer by dehydrogenating and crystallizing a hydrogenated amorphous silicon layer simultaneously, with specific conditions such as a blue laser power of 7 W or higher, a wavelength range of 400-500 nm, and a scan speed of 200-500 mm/s, resulting in a semiconductor layer with an average grain size of 50-200 nm and thickness of 50-800 nm, which simplifies the process and enhances performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional manufacturing methods are used for thin film transistors, then the process is complex and costly, but the semiconductor layer crystallization and dehydrogenation performance is limited
Solution Approach 1:
The patent combines the dehydrogenation and crystallization processes into a single blue laser annealing step. The blue laser simultaneously removes hydrogen from the amorphous silicon layer and crystallizes it into polysilicon, eliminating the need for separate dehydrogenation and crystallization furnace processes. This merging of processes reduces manufacturing complexity while achieving high-performance semiconductor layers with grain sizes of 50-200 nm.
Solution Approach 2:
The patent replaces traditional thermal furnace-based dehydrogenation and crystallization processes with blue laser annealing. The blue laser (wavelength 400-500 nm) directly excites the silicon atoms, enabling simultaneous dehydrogenation and crystallization without requiring high-temperature furnace environments. This substitution reduces process complexity and manufacturing cost while improving semiconductor layer quality.
2Reliability
If blue laser annealing is used with high power (7 W or higher), then dehydrogenation and crystallization are performed simultaneously improving performance, but energy consumption increases
Solution Approach 1:
The patent optimizes blue laser parameters including power (7 W or higher), wavelength (400-500 nm), and scan speed (200-500 mm/s) to achieve simultaneous dehydrogenation and crystallization. By carefully controlling these parameters, the process achieves high-performance semiconductor layers with controlled grain sizes (50-200 nm) while managing energy consumption efficiently. The specific parameter range ensures adequate energy delivery for process completion without excessive energy waste.
3Productivity
If the blue laser scan speed is increased to 200-500 mm/s, then productivity improves, but the energy delivery time to each point is reduced
Solution Approach 1:
The patent employs dynamic control of the blue laser scanning process, adjusting scan speed (200-500 mm/s) based on process requirements. The system dynamically balances scan speed against energy delivery by maintaining laser power at 7 W or higher, ensuring that even at high scan speeds, sufficient energy is delivered to achieve complete dehydrogenation and crystallization. This dynamic approach maximizes productivity while maintaining semiconductor layer quality.
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
This method simplifies the manufacturing process, reduces costs, and achieves high performance by improving the semiconductor layer's grain size and electron mobility, thereby enhancing the overall characteristics of the thin film transistor.
Implementation Method 1
In the step of performing blue laser annealing, dehydrogenation and crystallization are performed in the hydrogenated amorphous silicon layer
Implementation Method 2
In the step of performing blue laser annealing, dehydrogenation and crystallization are performed in the hydrogenated amorphous silicon layer
Implementation Method 3
a blue laser may scan the semiconductor layer one time to three times... The power of a blue laser which is used in the step of performing blue laser annealing may be 7 W or higher
Data Source
AI summary
A manufacturing method for a thin film transistor according to an exemplary embodiment includes a step of forming a buffer layer on a substrate, a step of forming a hydrogenated amorphous silicon layer on the buffer layer, a step of performing blue laser annealing on the hydrogenated amorphous silicon layer, and a step of forming a semiconductor layer by doping parts of the hydrogenated amorphous silicon layer with impurities, and in the step of performing blue laser annealing, dehydrogenation and crystallization are performed in the hydrogenated amorphous silicon layer.