Raised-Base BJT Structure for Smaller-Node Semiconductor Scaling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Scaling of bipolar junction transistors (BJTs) in integrated circuits to smaller nodes requires novel semiconductor processing approaches, and integrating BJTs with other devices complicates this processing.
Innovation Solution
A semiconductor device is described, featuring a bipolar junction transistor with a collector layer, a base layer, a raised base layer, a dielectric spacer, and an emitter layer, where the raised base layer has a substantially continuous upper surface from a distance away from the emitter layer to the dielectric spacer underlying it. This structure enables vertical and horizontal scaling of the BJT and simplifies processing by reducing the number of steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional semiconductor processing is used for BJT fabrication, then existing device integration is maintained, but scaling to smaller nodes is limited and processing complexity increases
Solution Approach 1:
The patent inverts the conventional sequence by forming the raised base layer before the emitter layer, rather than after. This inversion enables the base layer to define the emitter footprint naturally, simplifying subsequent processing steps and enabling better scaling to smaller nodes while reducing overall processing complexity
Solution Approach 2:
The raised base layer is formed in advance before emitter deposition. This preliminary action establishes the geometric template for the emitter layer, allowing the emitter to be formed with proper alignment and dimensions automatically, thereby reducing the number of subsequent alignment and patterning steps required
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 described semiconductor processing allows for improved characteristics and characteristics of BJTs, including vertical and horizontal scaling, while reducing processing complexity and costs.
Implementation Method 1
epitaxially growing a raised base layer on the base layer
Data Source
AI summary
The present disclosure generally relates to semiconductor processing for a bipolar junction transistor (BJT). In an example, a semiconductor device includes a semiconductor substrate and a bipolar junction transistor on the semiconductor substrate. The bipolar junction transistor includes a collector layer on the semiconductor substrate, a base layer on the collector layer, a raised base layer on the base layer, a dielectric spacer on the base layer and along a sidewall of the raised base layer, and an emitter layer on the base layer. The dielectric spacer is laterally between the raised base layer and the emitter layer. The emitter layer extends over the dielectric spacer and at least partially over the raised base layer. The raised base layer has a substantially continuous upper surface from a distance away from the emitter layer to the dielectric spacer underlying the emitter layer.