Hybrid Silicon Drift Detector With Flip-Chip Preamplifier Integration
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Solution Overview
Problem
Conventional silicon drift detectors (SDDs) face challenges with external preamplifiers due to increased electrical capacitance and mechanical instability from wire bond connections, leading to higher noise and reduced detection bandwidth.
Innovation Solution
A hybrid integrated silicon drift detector (HiSDD) integrates a silicon drift detector with a low-noise preamplifier module using flip chip bonding, minimizing electrical capacitance and mechanical instability by replacing wire bonds with stable flip chip connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wire bond connections are used to connect external preamplifier to SDD sensor chip, then the detector assembly can be manufactured with separate preamplifier module, but the electrical capacitance increases and mechanical instability occurs leading to higher noise
Solution Approach 1:
The patent merges the SDD sensor chip and preamplifier module into a hybrid integrated detector by directly bonding the preamplifier to the sensor chip substrate. This eliminates the wire bond connection between the separate components, thereby reducing electrical capacitance and mechanical instability that cause noise, while still allowing the preamplifier to be manufactured as a separate module before integration.
Solution Approach 2:
The patent replaces the mechanical wire bond connection system with a direct chip-to-substrate bonding system. The preamplifier module is bonded directly to the SDD sensor chip substrate, eliminating the mechanical wire bonds that cause instability and noise, while maintaining the functional separation of the preamplifier module.
2Ease of manufacture
If wire bond connections are used to connect preamplifier to SDD sensor chip, then external preamplifier can be used, but the detection bandwidth is reduced due to increased capacitance
Solution Approach 1:
The patent combines the preamplifier module with the SDD sensor chip through direct bonding, eliminating the wire bond capacitance that limits detection bandwidth. This merging approach maintains the external preamplifier configuration while removing the capacitive bottleneck imposed by wire bonds.
Solution Approach 2:
The patent changes the electrical connection parameter from wire bond (higher capacitance) to direct chip bonding (lower capacitance). This parameter change in the connection method reduces the total capacitance in the signal path, thereby increasing the detection bandwidth while still allowing external preamplifier usage.
3Reliability
If flip chip bonding is used to integrate preamplifier module with SDD sensor chip, then electrical capacitance is minimized and response time is reduced, but fabrication complexity increases
Solution Approach 1:
The patent segments the detector system into two separately manufactured components (SDD sensor chip and preamplifier module) that are later bonded together using flip chip bonding. This segmentation allows each component to be optimized and manufactured independently, while the flip chip bonding provides low capacitance connection. The fabrication complexity is managed by performing the bonding after individual component fabrication.
Solution Approach 2:
The patent uses flip chip bonding as an intermediary connection method between the preamplifier module and SDD sensor chip. This intermediary bonding technique provides the desired low capacitance and fast response time while managing fabrication complexity by serving as a bridge between the separately manufactured components.
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 HiSDD achieves low electric capacitance, fast response times, and improved detection bandwidth with reduced noise, simplifying the fabrication process and enhancing the stability of the detector assembly.
Implementation Method 1
a contact is formed above the contact region, is electrically conductively connected to the contact region and is configured for flip chip bonding
Implementation Method 2
the energy of an incoming X-ray photon can be measured by the amount of charge carriers caused by pair generation when it is absorbed inside the sensitive region of the detector material
Implementation Method 3
By superimposing a second voltage on the space charge zone, the charge carriers can drift in a controlled manner to a corresponding contact region
Data Source
AI summary
The present invention refers to a hybrid integrated silicon drift detector (HiSDD) for X-ray detection, particularly to a HiSDD combining a silicon drift detector (SDD) with a low-noise preamplifier on a SDD sensor chip to improve the electrical and structural properties of the detector assembly. The invention further refers to a corresponding method for the fabrication of a HiSDD. A HiSDD according to the invention hybridly integrates a silicon drift detector, SDD, sensor chip and a preamplifier module; wherein electrically conductive paths are formed on a surface of the SDD sensor chip, having first ends configured for flip chip bonding and second ends configured for wire bonding; wherein the preamplifier module having contacts disposed on a surface of the preamplifier module, and wherein the first ends of the electrically conductive paths are flip chip bonded to the contacts of the preamplifier module.