Infrared radiators are used for heating semiconductor silicon wafers.

A wafer, also known as a semiconductor wafer or silicon wafer, is one of the fundamental materials widely used in the semiconductor industry. Wafer heating is a crucial step in the semiconductor manufacturing process, aimed at performing necessary thermal treatments on the wafer during the fabrication of integrated circuits and other semiconductor devices. It removes organic matter and bubbles, activates materials, adjusts shapes, enhances material structures, and ensures the surface purity and quality of the silicon wafer. During this process, the wafer typically needs to be uniformly heated to a specific temperature to allow it to perform better in various applications, thereby facilitating or optimizing subsequent process steps.

Heating is one of the most important steps in the process of silicon wafer fabrication, involving many process steps, generally including the following aspects:

1. Crystal growth: In the process of crystal growth, silicon material needs to be melted and heated to a certain temperature. By controlling the temperature and time, the silicon material is crystallized and gradually grown into a crystal.
2. Wafer cutting: In the grown crystal, it needs to be cut into thin slices. During the cutting process, the silicon wafer needs to be heated to ensure the cutting quality and the integrity of the silicon wafer.
3. Semiconductor processing: After the silicon wafer is cut into a wafer, semiconductor processing is required, including multiple process steps such as cleaning, deposition, photolithography, etching, and ion implantation. Different process steps require different heating temperatures and times to complete their respective functions.
4. Annealing: In the semiconductor processing, in order to eliminate lattice defects and improve crystal quality, annealing is required, that is, heating the wafer to a certain temperature and holding it for a certain time, so that the defects in the crystal can be eliminated.

During the wafer heating process, it is required that the temperature distribution on the wafer surface be as uniform as possible to ensure consistent device performance throughout the entire wafer. Uneven temperature distribution may lead to differences in device performance and affect product quality. Using an infrared radiator for heating, the light is focused on the wafer and quickly heated to the desired temperature, which may take only a few seconds to tens of seconds. Quickly respond and adjust heating power to reduce temperature overshoot or insufficiency, effectively preventing temperature fluctuations that may cause process problems, allowing the heated surface to receive average infrared radiation energy, and effectively reducing adverse process quality problems caused by uneven temperature.

Compared to traditional heating methods, infrared radiators have the following significant advantages:

1. High control accuracy: precise temperature control greatly improves the quality of wafer production;
2. Good thermal uniformity: uniform heating temperature distribution, high efficiency, and fast response;
3. Energy saving and environmental protection: The heat generated during the heating process is mainly concentrated on the surface of the object, so there is no need to heat the entire air, reducing energy waste, and also not producing exhaust gas and other pollutants. It is a more environmentally friendly heating method.