BJT-CFET Integration Layout With Transition Composite Structure
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Solution Overview
Problem
The challenge of integrating bipolar junction transistors (BJTs) with other devices in integrated circuits, particularly in scaling to smaller nodes, complicates semiconductor processing and requires novel approaches to achieve high performance and high current drive needs.
Innovation Solution
A semiconductor device is fabricated with a BJT region, a complementary FET region, and a transition region, where a composite structure includes a material identical to the gate electrode of the FET, and methods are developed to form a collector, base, and emitter layers with improved photolithography alignment and processing ease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If BJTs are integrated with other devices in an integrated circuit, then high performance and high current drive needs are satisfied, but semiconductor processing becomes complicated
Solution Approach 1:
The semiconductor substrate is divided into distinct regions: a BJT region for bipolar junction transistors, a CFET region for complementary field effect transistors, and a transition region connecting them. This spatial segmentation allows each device type to be optimized independently while maintaining overall integration, thus satisfying high performance requirements without overly complicating the semiconductor processing.
Solution Approach 2:
A composite structure is introduced in the transition region between the BJT region and CFET region. This composite structure acts as an intermediary element that facilitates the integration of the two different device types, enabling smooth transitions and interactions between BJT and FET components while simplifying the overall processing architecture.
2Area of moving object
If devices are scaled to smaller nodes, then integration density increases, but novel semiconductor processing approaches are required
Solution Approach 1:
Different regions of the semiconductor substrate are assigned different structures and materials optimized for their specific functions. The BJT region, CFET region, and transition region each have locally optimized characteristics, allowing high integration density at smaller nodes while maintaining manufacturability through region-specific processing approaches rather than requiring entirely novel processing for the entire device.
Data Source
AI summary
The present disclosure generally relates to semiconductor processing integration for a bipolar junction transistor (BJT). In an example, a semiconductor device includes a semiconductor substrate, a BJT, a field effect transistor (FET), and a composite structure. The semiconductor substrate includes a BJT region, a complementary FET (CFET) region, and a transition region between the BJT region and the CFET region. The BJT is on the semiconductor substrate in the BJT region. The FET is on the semiconductor substrate in the CFET region. The composite structure is on the semiconductor substrate in the transition region. The composite structure includes a material that is the same as a gate electrode of the FET.