Conductive Coated Dielectric Handle for Electrostatic Chucking
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Solution Overview
Problem
Existing methods for electrostatically chucking semiconductor structures face challenges due to the accumulation of electrical charges on insulator handle substrates, leading to arcing and structural damage during processing.
Innovation Solution
A dielectric handle substrate coated with a conductive material layer is used, allowing for electrostatic chucking by providing a conductive path that prevents charge accumulation, and an adhesive layer is employed for bonding and deactivation to facilitate handling and detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a dielectric handle substrate is used for mechanical handling and bonding, then ease of operation and bonding capability are improved, but electrical charge accumulation occurs leading to arcing and structural damage
Solution Approach 1:
The handle substrate is segmented into two functional layers: a dielectric layer for mechanical handling and bonding, and a conductive layer for charge dissipation. This segmentation allows each layer to perform its specific function without interfering with the other, resolving the contradiction between ease of operation and prevention of harmful effects.
Solution Approach 2:
The handle substrate uses a composite structure combining dielectric and conductive materials. The dielectric portion provides mechanical strength and bonding capability, while the conductive portion provides charge dissipation path. This composite approach allows simultaneous achievement of ease of operation and protection against arcing.
2Reliability
If a conductive material layer is added to the dielectric handle substrate, then charge accumulation is prevented and arcing is eliminated, but device complexity increases
Solution Approach 1:
The conductive layer is implemented as a thin film deposited on the dielectric handle substrate. This thin film approach provides the necessary charge dissipation function while minimizing the increase in device complexity and maintaining compatibility with existing manufacturing processes.
Solution Approach 2:
The conductive layer serves multiple functions: it provides a charge dissipation path to prevent arcing, maintains electrical neutrality during processing, and does not interfere with the bonding functionality of the dielectric layer. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device 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 prevents arcing and structural damage by ensuring a conductive path for electrostatic chucking, enabling stable processing and efficient handling of semiconductor interposers and chips.
Implementation Method 1
electrostatically chucking the bonded semiconductor structure directly on an electrostatic chuck of a processing tool
Implementation Method 2
providing a conductive path that prevents charge accumulation
Implementation Method 3
bonding a front surface of the dielectric handle substrate to a semiconductor interposer structure employing an adhesive layer
Implementation Method 4
an adhesive layer, which may be deactivated by ultraviolet (UV) radiation
Data Source
AI summary
A back of a dielectric transparent handle substrate is coated with a blanket conductive film or a mesh of conductive wires. A semiconductor substrate is attached to the transparent handle substrate employing an adhesive layer. The semiconductor substrate is thinned in the bonded structure to form a stack of the transparent handle substrate and the semiconductor interposer. The thinned bonded structure may be loaded into a processing chamber and electrostatically chucked employing the blanket conductive film or the mesh of conductive wires. The semiconductor interposer may be bonded to a semiconductor chip or a packaging substrate employing C4 bonding or intermetallic alloy bonding. Illumination of ultraviolet radiation to the adhesive layer is enabled, for example, by removal of the blanket conductive film or through the mesh so that the transparent handle substrate may be detached. The semiconductor interposer may then be bonded to a packaging substrate or a semiconductor chip.