We present new microTEGs based on doped Bi 2 Te 3 thin films deposited on polyimide membrane able to operate under a temperature difference as high as 280 K. We developed two microTEGs with different designs to obtain the lowest internal resistance possible. The thermoelectrical properties coupled to the low contact resistance lead to an open circuit voltage of 64 mV and a maximum output power of 36 µW under a temperature difference of 206 K. Such high temperature difference cannot be obtain in bulk commercial TEG systems; it is maintained without heat sink but only using a copper ring supporting a thin polyimide membrane. These thermoelectric devices deposited on suspended polyimide membranes open new ways for waste heat applications, in particular by direct mechanical and thermal contact with hot sources. • We present new microTEGs based on doped Bi 2 Te 3 thin films deposited on polyimide membrane. • An open circuit voltage of 64 mV and a maximum output power of 36 µW under a temperature difference of 206 K is obtained. • The temperature difference up to 206 K is obtained without heat sink but only using a copper ring.