BLSO Transparent Conductive Thin Films With Lower-Cost Sputter Deposition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for producing high-mobility transparent conductive oxide thin films, such as Ba1-xLaxSnO3, are costly, complex, and not suitable for large-scale production due to the need for expensive deposition equipment and techniques like molecular beam epitaxy, which limits their widespread application in devices like transparent displays and photovoltaic cells.
Innovation Solution
A method using magnetron sputtering technology to fabricate Ba1-xLaxSnO3 thin films with reduced dislocation density by growing a BSO buffer layer or annealing in an anoxic atmosphere, employing ultrapure argon and specific substrate materials, to achieve high room-temperature mobility and transparency, making the process more economical and scalable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If molecular beam epitaxy or pulsed laser deposition is used to grow BLSO thin film, then room-temperature carrier mobility is improved (reaching 183 cm2/V·s), but equipment cost and manufacturing complexity increase significantly
Solution Approach 1:
The patent replaces expensive molecular beam epitaxy equipment with a simpler magnetron sputtering system, using a consumable BLSO target that can be directly sputtered to form high-quality thin films. This substitution of expensive equipment with a more economical alternative achieves comparable mobility (115 cm2/V·s) without the complexity of ultra-high vacuum systems and molecular beam sources
Solution Approach 2:
The patent optimizes sputtering parameters including using 99.999% pure argon gas, controlling deposition pressure at 25-77 Pa, and maintaining substrate temperature at 750-950°C to achieve low dislocation density and high carrier mobility. These parameter optimizations compensate for the simpler equipment by creating ideal deposition conditions that maximize film quality
2Manufacturing precision
If molecular beam epitaxy technique is used to obtain high-quality single crystal epitaxial thin film, then room-temperature carrier mobility is improved, but raw material cost and equipment cost increase
Solution Approach 1:
The patent uses a consumable BLSO sputtering target made from readily available oxides (BaO, La2O3, SnO2) rather than requiring expensive indium tin oxide or complex precursor materials. The target is directly sputtered to form the thin film, eliminating the need for costly molecular beam epitaxy materials and ultra-pure precursors while achieving comparable crystal quality
Solution Approach 2:
The patent creates a composite target material by combining BaO, La2O3, and SnO2 in specific ratios to form a BLSO sputtering target. This composite approach allows direct sputtering of the desired BLSO stoichiometry, eliminating the need for complex in-situ doping processes required by other methods and reducing overall material costs
3Ease of manufacture
If magnetron sputtering technology is used to fabricate BLSO thin film, then production cost and complexity are reduced, but dislocation density increases and room-temperature mobility decreases
Solution Approach 1:
The patent performs preliminary optimization of the sputtering process parameters before actual film deposition, including pre-conditioning the target surface, establishing stable plasma conditions, and pre-heating the substrate to the optimal temperature range. This preliminary preparation ensures that the film grows with minimal dislocations from the outset, compensating for the inherently higher defect density risk of sputtering compared to epitaxial methods
Solution Approach 2:
The patent systematically optimizes multiple sputtering parameters: using 99.999% pure argon gas to reduce contamination, controlling deposition pressure at 25-77 Pa to balance film density and growth rate, and maintaining substrate temperature at 750-950°C to promote atomic rearrangement and reduce dislocations. These parameter changes transform magnetron sputtering from a high-defect method into one that produces low-dislocation films with mobility reaching 115 cm2/V·s
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 method achieves room-temperature mobility of up to 115 cm2/V·s and carrier concentration of 1.2×1021 cm−3, enabling the production of high-quality transparent conductive oxide thin films suitable for various devices while reducing production costs and complexity.
Implementation Method 1
directly depositing and preparing a BLSO thin film by means of a magnetron sputtering method
Implementation Method 2
annealing at an anoxic atmosphere is beneficial to a reduction of dislocation density in the BLSO thin film
Data Source
AI summary
A method for fabricating a transparent conductive oxide thin film, the method comprising the following steps: fabricating Ba1-xLaxSnO3 using a solid-phase reaction method to obtain a BLSO magnetron sputtering target material; and fabricating a BLSO thin film by means of direct deposition with argon as a sputtering gas by using a SrTiO3, MgO, LaAlO3, (La,Sr)(Al,Ta)O3(LSAT), MgAl2O4 or Al2O3 single crystal substrate and the BLSO magnetron sputtering target material, such that the transparent conductive oxide thin film is fabricate is provided. During sputtering, the temperature of the substrate is 750° C.-950° C., and the deposition pressure of the Ar gas is 25-77 Pa. The room-temperature mobility of the transparent conductive oxide thin film can reach 115 cm2/V·s, the room-temperature carrier concentration can reach 1.2×1021 cm−3, and the room-temperature conductivity can reach 14,000 S/cm.