Thermoelectric refrigeration uses the Peltier effect to cool or heat the junction between two dissimilar conducting materials when electric current is passed through. Thermoelectric modules made of doped semiconductors like bismuth telluride are commercially available and have applications like mini-bar refrigerators and beverage coolers due to their compact size, reliability, and lack of moving parts. However, thermoelectric refrigeration has lower efficiency than vapor compression and requires improved materials and heat exchangers to approach vapor compression system efficiencies and see broader food sector applications.