SYNTHESIS OF BISMUTH TELLURIDE (BI-TE) PASTE AND THERMOELECTRIC MATERIAL FORMING METHOD USING PASTE

摘要

PURPOSE: A bismuth-tellurium-based paste synthesizing method and a thermoelectric material forming method using a paste are provided to improve thermoelectric characteristics by using a screen printing technique. CONSTITUTION: A thermoelectric material forming method using a paste includes the following steps: a step of synthesizing a bismuth-tellurium-based paste by mixing bismuth-tellurium powder, a solvent, a binder, and glass powder (S10); a step of printing the bismuth-tellurium-based paste on a substrate (S20); a step of drying the printed substrate in order to evaporate the solvent from the printed substrate (S30); and a step of annealing the dried substrate at a higher temperature than the temperature of the drying step in order to evaporate the binder from the dried substrate (S40). [Reference numerals] (AA) Bi-Te Powder(75wt%) + solvent(20.3wt%) + Binder(2.3wt%) + Glass Powder(2.44wt%); (BB) Dry for 10-20 minutes in an oven with 100-200°C of temperature; (CC) Proceed all the thermal treatment steps by putting bismuth-tellurium powder with specimens; (DD) First step - thermal treatment at 200°C for 5 minutes in an N_2 atmosphere; (EE) Second step - thermal treatment at 500°C for 30 minutes in the N_2 atmosphere; (FF) Third step - thermal treatment at 500°C for 15 or more minutes in the N_2 atmosphere; (S10) Paste synthesizing step; (S20) Screen printing step; (S30) Drying step; (S40) Thermal treatment step