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Semiconductor chips form the foundation of modern technologies. They are found in smartphones, electric cars, medical devices and industrial equipment. Their manufacture combines high-precision production processes, complex automation and a precisely coordinated flow of materials.
But how does a piece of high-purity silicon become a functional semiconductor chip? The journey from wafer to finished chip involves numerous coordinated process steps – from the fabrication of the electronic structures in the wafer fab to die separation and subsequent IC packaging.
A semiconductor chip is produced in several successive manufacturing stages. In the wafer fab, the chip’s electronic structures are built up on a silicon wafer through repeated processes such as layer deposition, lithography, etching and doping. The wafer is then tested and separated into individual ‘dies’.
In IC packaging, these dies are electrically connected, mechanically protected and prepared for their subsequent use.
Silicon → Wafer → Wafer fab → finished chip structures → Die separation → Die → IC packaging → finished chip
The actual electronic structures are manufactured in the wafer fab, known as the ‘front-end’ of semiconductor production. There, the wafers are processed in numerous steps under extremely controlled conditions.
Production begins with high-purity silicon. Thin slices are cut from a silicon crystal, ground and polished with high precision. These wafers form the basis for further chip manufacturing.
Many identical chip structures are fabricated simultaneously on a single wafer. Once fabrication is complete, these structures are separated from one another and processed further as individual dies. The number of dies produced on a wafer depends, amongst other things, on the wafer size and the area of the respective chip structure.
Manufacturing in the wafer fab consists of numerous sequential and repetitive process steps. These include, amongst others, the deposition of material layers, photolithography, etching and doping.
These processes are used to build up the various structures and layers of a chip step by step. In the process, the individual layers must be aligned with the utmost precision.
These steps are not carried out just once. Layer deposition, lithography, etching, doping and other process steps are repeated over and over again to build up the chip’s various layers and structures.
This is how, layer by layer, the complex architecture of a modern semiconductor is created. In the process, the individual structures must be aligned with one another with the utmost precision during each cycle. It is only through the interplay and repeated execution of these processes that the silicon wafer is transformed into a highly complex chip structure containing a large number of transistors and electrical connections.
Once production is complete, the wafer contains many individual chip structures. Before these are processed further, the finished structures are inspected and then separated from one another.
During the separation process, also known as dicing, the wafer is divided into individual chip structures along the designated cutting lines. These individual, as yet unpackaged chip structures are referred to as dies.
This marks the completion of the manufacture of the electronic structures.
The next step is packaging.
Following wafer fabrication and die separation, the individual die undergoes IC packaging. IC packaging stands for ‘Integrated Circuit Packaging’ and refers to the processes by which the chip is electrically connected, mechanically protected and prepared for its subsequent use.
An unpackaged die is delicate and cannot easily be integrated into an electronic system. Packaging therefore fulfils several important functions.
Among other things, it provides:
Depending on the application, different packaging technologies are used. These include, for example, bond wires, flip-chip connections, microbumps and other interconnect technologies.
IC packaging connects the finished die to the outside world. To achieve this, electrical connections are made to the chip and it is integrated into a suitable housing or package structure.
At the same time, the packaging protects the die from mechanical stress and external influences. Heat dissipation also plays an important role, as modern chips can generate considerable amounts of heat during operation.
The result is a component that can be integrated into an electronic system and used reliably within it.
The manufacture of semiconductors places high demands not only on the manufacturing processes themselves. The environment in which these processes take place and the transport of materials are also crucial.
During their manufacture, wafers must pass through numerous pieces of equipment and process steps. At the same time, their quality must not be compromised by particles, vibrations or other external influences.
Semiconductor production can only take place when both areas work together.
Together, they determine:
As modern chips become increasingly complex, these two areas are becoming ever more intertwined.
The material flow links all the process steps in semiconductor production.
Wafers and dies pass through testing processes, transitions between production stages and transport between production lines.
Any disruption has a direct impact on the entire value chain.
A stable, continuous material flow is crucial to production reliability, efficiency and the quality of the end product.
The manufacture of semiconductors is one of the most technically demanding industrial production processes. Numerous process steps must be precisely coordinated with one another. At the same time, there are high standards regarding cleanliness, precision, automation and availability.
The semiconductor industry is constantly evolving. Increasing demands for computing power, energy efficiency and integration density are driving the development of new manufacturing and packaging technologies.
Key developments include:
3D integration and advanced packaging
In 3D integration, multiple chip structures or dies are connected vertically or in a particularly compact configuration. This makes it possible to shorten signal paths, increase data transfer rates and improve the energy efficiency of the overall system. In addition, advanced packaging enables the highly integrated combination of different chips or chiplets within a single package. This technology allows different functions – such as computing power, memory and communication units – to be combined in a particularly high-performance and space-saving manner.
Chiplet architectures
In chiplet architectures, a complex system is not necessarily implemented as a single large chip. Instead, several smaller, functionally specialised dies can be combined with one another.
This enables a flexible combination of different functions and can offer advantages in terms of development, manufacturing and system integration.
Co-packaging of electronics and photonics
Electronic and optical components can increasingly be integrated together within a single package. Particularly in applications with high demands on data transmission and bandwidth, this close integration can open up new possibilities for high-performance and energy-efficient systems.
AI-supported process optimisation
The increasing digitalisation of manufacturing enables the analysis of large volumes of production and process data. Artificial intelligence and data-driven methods can help to monitor processes, detect deviations at an early stage and further optimise production workflows.
Greater automation and intelligent material flows
As manufacturing becomes increasingly complex, so too do the demands placed on automation. Wafers and dies must be moved reliably and at the right time between an ever-increasing number of process steps and pieces of equipment.
Consequently, the importance of intelligent and highly available material flow systems is also growing.
The more complex semiconductor production becomes, the more important a stable and automated material flow becomes. OHT systems handle the transport of wafers and materials within the production environment.
To ensure these systems can operate continuously, they require a reliable power supply. In cleanrooms in particular, there are specific requirements regarding availability, maintenance requirements and environmental conditions.
Reliable power transmission systems support this:
reliable operating conditions
The power supply thus becomes a key component of the infrastructure that enables the automated flow of materials in semiconductor production.
VAHLE supports semiconductor manufacturers worldwide with solutions for safe and reliable power transmission in highly automated production and cleanroom environments.
VAHLE’s systems are designed to reliably supply power to overhead transfer systems (OHT) and other material-handling systems. In this way, they help ensure that automated transport systems can operate continuously under the demanding conditions of semiconductor production.
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