Optically Gated Transistor Chemical Sensing for Real-Time Field Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for detecting chemical substances like PFAS are not fast, reliable, and field-deployable, requiring significant sample preparation and are not suitable for real-time detection.
Innovation Solution
An optically gated transistor device comprising a semi-conductive substrate, insulative layer, photo-active layer, and electrodes, which uses light to excite electron-hole pairs and measure electrical current changes for real-time chemical detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If liquid chromatography tandem mass spectroscopy is used for chemical detection, then measurement precision is improved, but speed and field deployability deteriorate
Solution Approach 1:
The patent replaces complex mechanical chromatography systems with an optoelectronic sensor that uses light absorption and electron-hole pair generation to directly detect chemicals. This substitution of mechanical separation methods with optical detection enables real-time measurement while maintaining detection capability, resolving the contradiction between precision and speed.
Solution Approach 2:
The invention changes the detection parameter from indirect chromatographic separation to direct optical absorption measurement. By measuring light absorption characteristics and electrical current changes in the photo-active layer, the system achieves both high-speed real-time detection and sufficient measurement precision without requiring complex sample preparation or lengthy analysis procedures.
2Measurement precision
If liquid chromatography tandem mass spectroscopy is used for chemical detection, then measurement precision is improved, but device complexity and sample preparation requirements increase
Solution Approach 1:
The patent extracts and eliminates the complex chromatography column, mobile phase delivery system, and extensive sample preparation requirements from the detection system. By focusing on direct optical detection of chemical substances in their native state, the system achieves simplified device architecture while maintaining detection precision through optical property measurement.
Solution Approach 2:
The optoelectronic sensor performs self-detection by utilizing the inherent optical absorption properties of chemical substances. The photo-active layer automatically generates electrical signals in response to light absorption by target chemicals, eliminating the need for external complex analytical systems or extensive sample preparation protocols.
3Speed
If real-time detection is implemented, then speed is improved, but reliability may deteriorate due to environmental interference
Solution Approach 1:
The patent implements feedback through measurement of electrical current changes in the optoelectronic device that result from light absorption by chemical substances. This electrical signal feedback provides a reliable, quantifiable measure of chemical presence and concentration in real-time, enabling both fast detection and reliable measurement through continuous electrical signal monitoring.
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
Enables rapid, real-time identification and quantification of chemicals in the field, overcoming the limitations of existing methods by providing a portable and efficient detection system.
Implementation Method 1
The light excites electron-hole pairs within the substrate and the photo-active layer enabling an electrical current to pass between the source electrode and the drain electrode
Implementation Method 2
The presence of a chemical substance in proximity to the surface of the photo-active layer alters the electrical current in the presence of the light
Data Source
AI summary
A system may include an optoelectronic semiconductor device including a semi-conductive substrate, an insulative layer, a photo-active layer, a source electrode, and a drain electrode. The system may further include a light source configured to selectively apply light to a surface of the photo-active layer, where the light excites electron-hole pairs within the substrate and the photo-active layer enabling an electrical current to pass between the source electrode and the drain electrode, where the presence of a chemical substance in proximity to the surface of the photo-active layer alters the electrical current in the presence of the light, and where measurement of the electrical current during application of the light enables the chemical substance to be identified.