Optical Sensor Metal Interlayer for Reduced Interfacial Reflection
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Solution Overview
Problem
Existing optical sensors face issues with interfacial reflection, which reduces the amount of light input to the photosensitive layer, thereby affecting their sensitivity and efficiency.
Innovation Solution
Incorporating a metal layer between the first electrode and the photosensitive layer, using materials like Ti, Ta, Cr, Mo, W, or Pt, to reduce interfacial reflection and enhance light sensitivity across various wavelength ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a metal layer is added between the first electrode and the photosensitive layer, then interfacial reflection decreases and light sensitivity increases, but device complexity increases
Solution Approach 1:
A metal layer is introduced as an intermediary between the first electrode and the photosensitive layer. This intermediate layer serves as a mediator that reduces interfacial reflection of incident light, allowing more light to reach the photosensitive layer and thereby improving light sensitivity without fundamentally changing the core functional components.
Solution Approach 2:
The patent employs composite material structures by combining the metal layer with the electrode and photosensitive layer. The metal layer is specifically selected from materials such as Ti, Ta, Cr, Mo, W, or Pt, creating a composite interface that optimizes optical properties while managing electrical connectivity.
2Quantity of substance
If the metal layer is used to reduce interfacial reflection, then the amount of light reaching the photosensitive layer increases, but manufacturing complexity increases
Solution Approach 1:
The patent optimizes specific parameters of the metal layer including its material composition (selected from Ti, Ta, Cr, Mo, W, Pt), thickness (5 nm to 50 nm), and positioning relative to the electrode and photosensitive layer. These parameter optimizations enable effective reflection reduction while maintaining compatibility with standard manufacturing processes.
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 effectively decreases interfacial reflection, increasing the amount of light applied to the photosensitive layer and enhancing the sensor's light-receiving sensitivity.
Implementation Method 1
When incident light is reflected before reaching a photosensitive layer of the optical sensor, sufficient light cannot be input to the photosensitive layer
Implementation Method 2
Photoelectric converters have been used for various purposes. A photodiode is, for example, a pn junction diode using a pn junction of semiconductor and converts light to an electrical signal
Data Source
AI summary
An optical sensor, a receiver device, a transceiver device, a communication system, a terminal device, and an optical system that can curb interfacial reflection are provided. The optical sensor includes a photosensitive layer that generating a voltage in a case where the photosensitive layer is irradiated with light, a first electrode, a second electrode, and a metal layer. The photosensitive layer is located between the first electrode and the second electrode. The metal layer is located between the first electrode and the photosensitive layer. The metal layer includes one selected from a group consisting of Ti, Ta, Cr, Mo, W, and Pt.