Unconventional Heterointerface Doping for SRH Recombination Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In semiconductor devices, non-radiative recombination and generation, particularly Shockley-Read-Hall (SRH) recombination, are undesirable parasitic effects that reduce efficiency and performance, as they are often not accounted for in device designs, leading to losses in energy conversion and light emission.
Innovation Solution
Unconventional doping at or near the heterointerface of semiconductor devices shifts SRH generation and recombination into the wider band gap material, reducing the intrinsic carrier concentration and thereby decreasing SRH recombination rates, which is achieved by modifying the doping profile in specific layers near the heterojunction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional doping profiles are used in heterojunction devices, then device structure is simple and manufacturing is easier, but SRH generation and recombination losses are high
Solution Approach 1:
The patent applies local quality by implementing unconventional doping specifically at or near the heterointerface region, creating localized doping layers with different doping types and concentrations than the bulk materials. This targeted approach reduces SRH recombination at the critical interface region without requiring complex doping throughout the entire device structure.
Solution Approach 2:
The patent changes doping parameters (type, concentration, spatial distribution) in the heterointerface region to shift SRH generation and recombination into the wider band gap material. This involves modifying doping profiles to create specific charge distributions that manipulate carrier concentrations and reduce recombination rates at the interface.
2Loss of energy
If doping is increased to reduce intrinsic carrier concentration, then SRH recombination is reduced, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent segments the doping structure into distinct regions: conventional bulk doping and unconventional interface doping layers. This segmentation allows standard manufacturing techniques to be used for the bulk regions while applying specialized doping only where needed at the interface, simplifying overall fabrication.
Solution Approach 2:
The patent applies partial action by implementing unconventional doping only in thin layers (e.g., about 20 nm thick) at the heterointerface rather than throughout the entire device. This localized application achieves the desired reduction in SRH recombination with minimal additional manufacturing complexity.
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 approach enhances the performance of semiconductor devices by reducing SRH generation and recombination, leading to improved efficiency in solar cells, light-emitting diodes, and photodetectors, especially under low illumination or thermal conditions, and enables more effective thermal management in electronic devices.
Implementation Method 1
Shockley-Read-Hall (SRH) generation and/or recombination in heterojunction devices is suppressed by unconventional doping at or near the heterointerface
Data Source
AI summary
Shockley-Read-Hall (SRH) generation and/or recombination in heterojunction devices is suppressed by unconventional doping at or near the heterointerface. The effect of this doping is to shift SRH generation and/or recombination preferentially into the wider band gap material of the heterojunction. This reduces total SRH generation and/or recombination in the device by decreasing the intrinsic carrier concentration ni at locations where most of the SRH generation and/or recombination occurs. The physical basis for this effect is that the SRH generation and/or recombination rate tends to decrease as ni around the depletion region decreases, so decreasing the effective ni in this manner is a way to decrease SRH recombination.