Integrated Light-Receiving Emitting Device Leakage Current Suppression
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Solution Overview
Problem
Integrated light-receiving and emitting elements on the same substrate face accuracy issues due to leakage current generated by the light-emitting element, which interferes with the light-receiving element's detection accuracy, especially when the elements are positioned close to each other.
Innovation Solution
A light-receiving and emitting device with a semiconductor substrate where the light-receiving element has a first conductivity type semiconductor layer, anode, and cathode, connected to an operational amplifier with the electrode layer at the same potential, suppressing leakage current by grounding the cathode and using an electrode layer on the substrate to discharge excess carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the light-emitting element and light-receiving element are disposed closer to each other on the same substrate, then the detection accuracy of reflected light is improved, but leakage current generated by the light-emitting element increases and flows into the light-receiving element
Solution Approach 1:
The invention divides the substrate into distinct functional regions: a light-emitting element region and a light-receiving element region. By spatially segmenting these elements and providing separate electrode layers for each region, the patent prevents leakage current generated by the light-emitting element from interfering with the light-receiving element, while still maintaining close proximity for accurate reflected light detection.
Solution Approach 2:
The invention introduces an intermediary electrode layer structure that acts as a mediator between the light-emitting element and light-receiving element. This electrode layer is disposed on the substrate and connected to the light-receiving element, serving as an intermediate conductive path that prevents direct leakage current flow from the light-emitting element while allowing proper electrical connection for light reception.
2Adaptability or versatility
If the light-emitting element and light-receiving element are integrally disposed on the same substrate, then device integration is improved, but leakage current from the light-emitting element admixes with the output current from the light-receiving element
Solution Approach 1:
The invention segments the integrated device into distinct functional zones with separate electrode layers. The light-emitting element has its own electrode structure, and the light-receiving element has its own electrode layer connected to the substrate. This segmentation within integration allows close proximity for functionality while preventing electrical interference between the two elements.
Solution Approach 2:
The invention applies local quality by providing specific electrode layer configurations in different regions of the substrate. The electrode layer is strategically disposed in regions corresponding to the light-receiving element and connected to the substrate in a manner that creates localized electrical isolation, ensuring that each element operates with optimal electrical characteristics without interference from the other.
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
This configuration enhances the detection accuracy of reflected light by minimizing the impact of leakage current, allowing for precise light detection even when the light-emitting and receiving elements are closely integrated on the same substrate.
Implementation Method 1
a light-receiving element and a light-emitting element are integrally disposed close to each other on the same substrate
Implementation Method 2
an operational amplifier in which an inverting input terminal is connected to the first anode and a non-inverting input terminal is connected to the first cathode and the electrode layer is further included, and the electrode layer, the first anode, and the first cathode are at the same potential
Data Source
AI summary
The light receiving/emitting device uses an integrated light receiving/emitting element wherein a light receiving element and a light emitting element are provided on one main surface of a substrate. The substrate comprises a first-conductivity-type semiconductor. At least one electrode layer is placed in an area corresponding to at least the light receiving element and the light emitting element on the other main surface of the substrate. The light receiving element comprises: a first second-conductivity-type semiconductor layer formed on the one main surface of the substrate; a first anode electrode formed on the top surface of the first second-conductivity-type semiconductor layer; and a first cathode electrode formed on the top surface of the one main surface of the substrate. The electrode layer, the first anode electrode and the first cathode electrode have the same electric potential.