Light Sensor with Light-Sensitive Molecule for Narrowband Detection
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Solution Overview
Problem
Conventional approaches fail to achieve spectrally tunable narrowband responses with full width at half-maxima (FWHM) less than 100 nm for light detection, which is essential for precise spectral discrimination in photodetection applications.
Innovation Solution
A light sensor system integrating a light-sensitive molecule with a wavelength-specific absorbance spectrum and a semiconductor structure, where the light-sensitive molecule provides optical selectivity and the semiconductor structure provides electronic functionality, allowing for precise control of electrical conductance through electron transfer upon light exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional broadband photodetectors are combined with dichroic mirrors or optical filters for spectral discrimination, then spectral detection capability is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple functional components (light-sensitive molecules with specific absorbance spectra, semiconductor nanostructures for electron transfer, and protective layers) into a single integrated sensor system. This merging eliminates the need for separate dichroic mirrors and optical filters, achieving spectral discrimination while reducing overall device complexity.
Solution Approach 2:
The patent employs composite material structures where light-sensitive molecules are integrated with semiconductor nanostructures (such as silicon nanowires). This composite approach enables the system to achieve both optical selectivity through molecular absorbance and electronic functionality through semiconductor properties, resolving the contradiction between spectral precision and device simplicity.
2Measurement precision
If light-sensitive molecules with specific absorbance spectra are used for narrowband detection, then measurement precision is improved, but manufacturing complexity increases
Solution Approach 1:
The patent utilizes parameter changes in the light-sensitive molecules, specifically their absorbance spectra characteristics, to achieve narrowband detection. By selecting molecules with defined spectral properties (full width at half maximum less than 100 nm), the system achieves high measurement precision while the standardized molecular selection process helps manage manufacturing complexity.
3Measurement precision
If electron transfer between light-sensitive molecule and nanostructure is utilized for signal generation, then detection sensitivity is improved, but stability of electron transfer process worsens
Solution Approach 1:
The patent introduces a protective layer as an intermediary between the light-sensitive molecule and the semiconductor nanostructure. This intermediary component stabilizes the electron transfer process by providing a controlled interface, preventing direct but potentially unstable interactions while maintaining the sensitivity enhancement benefits of electron transfer.
Solution Approach 2:
The composite structure of light-sensitive molecules integrated with semiconductor nanostructures creates a stable system where the molecular and nanomaterial components work synergistically. The composite material approach ensures both high detection sensitivity through electron transfer and long-term stability, as demonstrated by the retention of ON and OFF states for several days.
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 system achieves spectrally specific detection with narrowband responses of less than 100 nm FWHM, enabling precise spectral discrimination and long-term nonvolatile memory effects, as demonstrated by the retention of ON and OFF states for several days at ambient conditions.
Implementation Method 1
the light sensitive molecule being selected such that upon irradiation of the light sensor by light having a central wavelength within the absorbance spectrum
Implementation Method 2
the sensitive molecule transfers or extracts an electron to or from the surface of the nanostructure
Data Source
AI summary
A light sensor comprises a nanostructure connectable to a source electrode and a drain electrode, and light sensitive moiety covalently attached to a surface of the nanostructure. The light sensitive moiety comprises a light sensitive molecule having an absorbance spectrum in a visible range. The light sensitive molecule is selected such that upon irradiation of the light sensor by light having a central wavelength within the absorbance spectrum, the sensitive molecule transfers or extracts an electron to or from the surface of the nanostructure.