Homogeneous Compound Semiconductor Thin-Films via Reacted Target Deposition
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Solution Overview
Problem
Conventional methods for manufacturing compound semiconductor thin-films, such as those used in photovoltaic devices, face challenges in achieving compositional and structural homogeneity, leading to inefficiencies and reliability issues due to inhomogeneities and defects in the light absorbing layers, which limits the conversion efficiency and cost-effectiveness of solar cells.
Innovation Solution
The Reacted Target Physical Deposition (RTPD) method involves pre-reacting raw semiconductor materials above the liquidus temperature to form a homogeneous compound semiconductor target, which is then deposited using physical vapor deposition techniques like magnetron sputtering, ensuring uniform composition and molecular structure in the thin-films, reducing the need for extensive post-deposition processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional PVD methods are used to deposit multi-component compound semiconductor materials, then deposition can be achieved, but compositional and structural homogeneity deteriorates due to preferential transport of subcomponents and non-uniform target consumption
Solution Approach 1:
The patent applies preliminary action by pre-reacting the multi-component compound semiconductor materials above the liquidus temperature to form a homogeneous compound semiconductor target before deposition. This pre-reaction ensures uniform composition and molecular structure in the target, which is then replicated in the deposited thin-film, eliminating the need for post-deposition processing to achieve homogeneity.
Solution Approach 2:
The patent changes the physical state and temperature parameters of the target material by heating it above the liquidus temperature during pre-reaction. This parameter change enables complete mixing and reaction of film components in-situ, creating a homogeneous target that deposits uniformly without preferential transport of subcomponents.
2Manufacturing precision
If heating of substrates is employed during deposition and post-deposition processing to promote mixing and reaction, then compositional uniformity improves, but processing time and energy consumption increase
Solution Approach 1:
The patent performs the mixing and reaction of film components in-situ during target preparation above the liquidus temperature before deposition. This preliminary action achieves complete compositional uniformity in the target, eliminating the need for extended post-deposition heating and processing time.
Solution Approach 2:
The patent extracts the mixing and reaction process from the post-deposition stage and moves it to the target preparation stage. By completing the compositional homogenization before deposition, the lengthy post-deposition heating process is eliminated or significantly reduced.
3Manufacturing precision
If post-deposition processing is used to remove inhomogeneity, then compositional uniformity improves slightly, but device reliability deteriorates due to generation of detrimental effects
Solution Approach 1:
The patent applies preliminary anti-action by pre-reacting the materials above the liquidus temperature to achieve complete compositional homogeneity in the target before deposition. This prevents inhomogeneity from forming in the first place, eliminating the need for corrective post-deposition processing that could introduce detrimental effects.
Solution Approach 2:
The patent performs the compositional homogenization action during target preparation rather than after deposition. This preliminary achievement of uniformity prevents the formation of defects and inhomogeneities that would otherwise require problematic post-processing to correct.
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
RTPD method produces thin-films with improved compositional and structural uniformity, enhancing performance and manufacturability, allowing for higher conversion efficiencies and lower production costs by minimizing defects and post-processing requirements.
Implementation Method 1
The compound semiconductor target material is deposited onto a substrate to form a thin-film having a composition substantially the same as a composition of the compound semiconductor target material
Implementation Method 2
Physical Vapor Deposition (PVD) processing in which films of the constituent elements are simultaneously or sequentially transferred from a source and deposited onto a substrate
Data Source
AI summary
A method is provided for fabricating a thin film semiconductor device. The method includes providing a plurality of raw semiconductor materials. The raw semiconductor materials undergo a pre-reacting process to form a homogeneous compound semiconductor target material. The compound semiconductor target material is deposited onto a substrate to form a thin film having a composition substantially the same as a composition of the compound semiconductor target material.