Semiconductor Cleavage Layout to Keep the Active Region Debris-Free
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Solution Overview
Problem
During substrate cleavage for semiconductor device production, foreign substrate scraps from the brittle rear surface can adhere to the active emission region, degrading device characteristics due to the lack of electrodes in the cleavage crack area, which affects separability and device performance.
Innovation Solution
A semiconductor device production method involving the placement of a less brittle laminated object or groove part directly above the active region on the rear surface, between electrodes, to prevent substrate scraps from adhering to the active area while ensuring cleavage separability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the substrate rear surface is left exposed without electrodes in the cleavage region, then cleavage separability is improved, but substrate scraps fall and adhere to the active region degrading device characteristics
Solution Approach 1:
A support structure (tray or frame) is introduced as an intermediary component between the substrate and the cleavage surface. This mediator receives and holds the substrate during cleavage, preventing scraps from falling onto the active region while maintaining easy separability. The support structure acts as a buffer that catches debris without interfering with the cleavage process.
Solution Approach 2:
A disposable substrate holder or tray is used during the cleavage process. This single-use component is designed to catch and contain substrate scraps, preventing them from contaminating the active region. After use, the holder is discarded along with the accumulated debris, eliminating the need for complex cleaning or reuse procedures.
2Ease of operation
If a thick substrate is used, then handling is easier, but cleavage becomes difficult
Solution Approach 1:
The substrate processing is segmented into two distinct phases: handling/transport phase and cleavage phase. During handling, the complete thick substrate is used for stability. During cleavage, the substrate is positioned on a specialized support structure that facilitates crack propagation. This segmentation allows each phase to be optimized independently without compromise.
Solution Approach 2:
The cleavage process is approached by adding a vertical dimension through the use of a support tray or frame structure. Instead of attempting to cleave the thick substrate directly on a flat surface, the substrate is elevated and supported from below, allowing the cleavage crack to propagate through the thickness dimension while maintaining ease of operation at the surface level.
Data Source
AI summary
A semiconductor device production method includes providing a first electrode and a second electrode on a rear surface of a substrate where an active region emitting light is formed and providing a laminated object formed of a material less brittle than the substrate at part of a region between the first electrode and the second electrode so as to position directly below the active region; and exposing a plane on which the active region appears by cleavage of the substrate together with the laminated object in a state where the laminated object is located directly above the active region.