What is a thermoelectric cooler?
A thermoelectric cooler is a solid-state heat pump that operates based on the Peltier effect. It has no moving parts and requires no refrigerant; instead, it uses direct current to actively transfer heat from one end of the device to the other, thereby achieving active cooling or heating. A typical thermoelectric cooler consists of numerous pairs of N-type and P-type semiconductor thermocouples—usually made of bismuth telluride-based materials—electrically connected via metallic interconnects (typically copper) and sandwiched between two ceramic substrates, forming a modular device.
Ceramic substrate:
It is typically made from aluminum oxide (Al₂O₃) or aluminum nitride (AlN).
Function: Provides electrical insulation, structural support, and an excellent thermal conduction path. Heat is transferred from the cooled object to the cold end via the ceramic plate, or dissipated from the hot end to the heat sink.
Semiconductor thermocouple pairs (N-P pairs):
This is the core of TEC. A single TEC module contains dozens to hundreds of such thermocouple pairs inside.
N-type semiconductor: Rich in electrons; electrons are the majority charge carriers.
P-type semiconductor: Rich in holes (which can be regarded as positively charged particles); holes are the majority carriers.
These thermocouple pairs are typically electrically connected in series.
Metal deflector/electrode:
By connecting individual semiconductor particles to form a series circuit and providing channels for charge carriers (electrons and holes) to enter and exit the semiconductors, the Peltier effect occurs precisely here.
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