Photodetector Diffractive Element Resonance Quantum Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional semiconductor photodetectors face limitations in quantum efficiency due to the absorption of photons with energies lower than the bandgap, leading to reduced current and voltage trade-offs, and existing techniques for improving colloidal quantum dot detectors have shown limited effectiveness in enhancing quantum efficiency across a broad wavelength range.
Innovation Solution
A photodetection device with a contact layer, an absorbing region, and at least one diffractive element that operates to diffract light into the absorbing region, with the configuration optimized by computer simulation to achieve constructive interference and resonance, enhancing quantum efficiency for specific wavelength detection ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional semiconductor photodetectors are used, then the device structure is simple, but quantum efficiency is limited due to photon absorption constraints
Solution Approach 1:
The photodetector is divided into multiple functional layers including a contact layer, absorbing region, and diffractive elements. This segmentation allows each layer to perform its specific function optimally, with the diffractive elements handling light manipulation and the absorbing region handling photon detection, thereby improving quantum efficiency without creating an unmanageably complex structure
Solution Approach 2:
The invention introduces diffractive elements that manipulate light in additional spatial dimensions through diffraction and interference patterns. By adding this optical dimension to the conventional planar structure, the device can trap and absorb photons more effectively across a broader wavelength range, improving quantum efficiency while maintaining a relatively compact form factor
2Reliability
If diffractive elements are added to create resonance, then quantum efficiency increases, but device complexity increases
Solution Approach 1:
The diffractive elements are designed and positioned in advance to pre-establish the resonant cavity structure and diffraction patterns before light enters the device. This preliminary configuration ensures that light is immediately directed into resonant modes upon entry, maximizing quantum efficiency from the first interaction without requiring complex real-time adjustments or additional control mechanisms
Solution Approach 2:
The diffractive elements act as intermediary structures between the incident light and the absorbing region. They mediate the light's path by creating diffraction patterns and resonant cavities that enhance absorption, allowing the light to interact more effectively with the absorbing material without requiring direct optimization of every interface between light and absorber
3Reliability
If computer simulation optimization is used, then quantum efficiency for specific wavelengths is enhanced, but manufacturing complexity increases
Solution Approach 1:
The invention utilizes computer simulation to optimize key parameters such as diffractive element geometry, spacing, and material properties to achieve desired resonant frequencies and diffraction patterns. By systematically varying these parameters in simulation, the design achieves maximum quantum efficiency for target wavelengths, and then these optimized parameters are transferred to manufacturing, reducing the need for complex iterative adjustments during production
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 solution significantly increases quantum efficiency by creating a resonant cavity within the photodetection device, allowing for improved absorption of incident light across a broader wavelength range, thereby enhancing the detection capabilities of the device.
Implementation Method 1
at least one diffractive element operatively associated with the absorbing region operating to diffract light into the absorbing region
Implementation Method 2
phases of diffracted waves from locations within the photo detection device or waves reflected by sidewalls and waves reflected by the at least one diffractive element form a constructive interference pattern inside the absorbing region
Implementation Method 3
The solution significantly increases quantum efficiency by creating a resonant cavity within the photodetection device, allowing for improved absorption of incident light across a broader wavelength range
Implementation Method 4
in a conventional solar cell or a photodiode, light is absorbed by a semiconductor, producing an electron-hole (e-h) pair
Data Source
AI summary
A photo detection device comprising a contact layer through which light enters; an absorbing region positioned such that light admitted through the contact layer passes into the absorbing region; at least one diffractive element operatively associated with the absorbing region operating to diffract light into the absorbing region; the configuration of the at least one diffractive element being determined by computer simulation to determine an optimal diffractive element (or elements) and absorbing region configuration for optimal quantum efficiency for at least one predetermined wavelength detection range, the at least one diffractive element operating to diffract light entering through the contact layer such that phases of diffracted waves from locations within the photo detection device or waves reflected by sidewalls and waves reflected by the at least one diffractive element form a constructive interference pattern inside the absorbing region. A method of designing a photodetector comprises using a computer simulation to determine an optimal configuration for at least one wavelength range occurring when waves reflected by the diffractive element form a constructive interference pattern inside the absorbing region.