Oxygen Control in III-V Semiconductor Substrates
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Solution Overview
Problem
Existing methods for controlling oxygen concentration in IIIA-VA compound semiconductor substrates are inadequate, as they fail to precisely manage oxygen levels, leading to variations in device yield and performance.
Innovation Solution
A method involving the use of a sealed container with III-V crystal substrates and a material with high chemical reactivity, such as carbon, aluminum, or titanium, is employed, where the substrates are annealed at a temperature between 1000°C and 1100°C at a controlled heating rate to achieve specific oxygen concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional annealing methods are used to control oxygen concentration in IIIA-VA compound semiconductor substrates, then the substrates undergo thermal treatment, but the oxygen concentration cannot be precisely managed leading to variations in device yield and performance
Solution Approach 1:
A sealed container is introduced as an intermediary system between the substrates and the external environment. The container maintains a controlled atmosphere with specific oxygen partial pressure, enabling precise oxygen concentration management during annealing without direct exposure to variable external conditions
Solution Approach 2:
The annealing process utilizes controlled changes in temperature and oxygen partial pressure parameters. By adjusting these parameters within specific ranges (temperature: 700-1100°C, oxygen partial pressure: 10^-5 to 10^-1 atm), the oxygen concentration in substrates can be precisely managed to achieve desired electrical characteristics
2Quantity of substance
If high temperature annealing is applied to reduce oxygen concentration, then oxygen is removed from substrates, but uncontrolled heating rates cause thermal stress and substrate damage
Solution Approach 1:
The heating rate is dynamically controlled to vary during the annealing process. The rate is adjusted based on the current temperature and substrate condition, allowing gradual oxygen removal while preventing excessive thermal stress that would compromise substrate integrity
Solution Approach 2:
Temperature and heating rate parameters are precisely controlled within specific ranges. The heating rate is maintained between 1-100°C/min, and temperature is held between 700-1100°C, enabling effective oxygen reduction while maintaining substrate structural integrity
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 approach effectively reduces oxygen concentration in III-V compound semiconductor substrates, resulting in lower point defect densities and improved substrate quality, enhancing device performance and yield.
Implementation Method 1
Atoms of predetermined amount of material have high chemical reactivity with oxygen atoms in the container, the material comprising at least one of carbon, aluminum, titanium, and boron
Implementation Method 2
annealing the plurality of III-V crystal substrates to yield an oxygen concentration in the crystal substrates. The annealing further comprises heating the container to a platform temperature between 1000°C and 1100°C at a predetermined heating rate of less than 100°C/hour
Data Source
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AI summary
A method of controlling oxygen concentration in III-V compound semiconductor substrate comprises providing a plurality of III-V crystal substrates in a container, providing a predetermined amount of material in the container. Atoms of the predetermined amount of material having a high chemical reactivity with oxygen atoms. The method further comprises maintaining a predetermined pressure within the container and annealing the plurality of III-V crystal substrates to yield an oxygen concentration in the crystal substrates. The oxygen concentration is associated with the predetermined amount of material.