Tin Halide Thin-Film Transistor for Low-Temperature High Mobility
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Solution Overview
Problem
Current thin-film transistors exhibit low charge mobility and are not suitable for high-resolution displays due to their low mobility and the high-temperature processing requirements of inorganic materials, which limits their application in flexible devices on plastic substrates. Additionally, there is a need for environmentally friendly semiconductor materials that do not contain lead.
Innovation Solution
A thin-film transistor using a semiconductor layer composed of cesium tin triiodide (CsSnI3) or methylammonium tin triiodide (MASnI3) with specific additives such as SnF2, SnBr2, SnI2, PbI2, and SbI2, which are added in varying proportions to enhance charge mobility and reduce Sn vacancies, allowing for low-temperature processing and lead-free manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If inorganic thin-film transistors are used to achieve high charge mobility, then charge mobility is improved, but manufacturing complexity increases due to high-temperature processes
Solution Approach 1:
The patent changes the processing temperature parameter from high-temperature (300°C) to low-temperature processes, enabling the formation of inorganic thin-film transistors on plastic substrates while maintaining high charge mobility characteristics
Solution Approach 2:
The patent employs composite material structures including gate insulating films, semiconductor layers, and electrode layers with specific material combinations that enable both high mobility and low-temperature processing compatibility
2Speed
If inorganic thin-film transistors are used to achieve high charge mobility, then charge mobility is improved, but adaptability worsens due to incompatibility with plastic substrates
Solution Approach 1:
The patent modifies the temperature parameter to enable processing on temperature-sensitive plastic substrates, achieving adaptability while preserving high charge mobility through optimized low-temperature fabrication processes
Solution Approach 2:
The patent develops a universal transistor structure that can be fabricated on both rigid and flexible substrates using low-temperature processes, making the device adaptable to various application scenarios including flexible displays
3Device complexity
If organic semiconductors are used to enable low-temperature processing, then manufacturing complexity is reduced, but charge mobility deteriorates
Solution Approach 1:
The patent uses composite material structures with gate insulating films, semiconductor layers, and electrode layers that collectively achieve both low-temperature processing capability and high charge mobility, overcoming the limitations of individual material types
Data Source
AI summary
Disclosed is a thin-film transistor including a substrate including a gate electrode formed thereon, a gate insulating film disposed on an entire face of the substrate, a semiconductor layer disposed on an entire face of the gate insulating film, and source and drain electrodes disposed on the semiconductor layer so as to be spaced apart from each other, wherein the semiconductor layer includes cesium tin triiodide (CsSnI3) or methylammonium tin triiodide (MASnI3), wherein the semiconductor layer further contains an additive.