Resulting materials had an electrical response comparable to counterparts produced using traditional firing. CSP and co-firing of multilayer thermoelectric devices was demonstrated by Funahashi et al[68]; integrated ZnO and Ca3Co4O9 (n-type and p-type) multi-layered thermoelectric oxides were fabricated at a sintering temperature below 300℃,and a PTFE insulator was interposed between the thermoelectric legs.