NOVELTY - A thermoelectric power source has a flexible substrate; and a thermocouple having a sputter deposited thin film p-type thermoelement and a sputter deposited thin film n-type thermoelement both positioned on an upper surface of the substrate adjacent to each other, and an electrically conductive member electrically connecting a first end of the p-type thermoelement with a second end of the n-type thermoelement.    USE - For converting a thermal energy to an electric power.    ADVANTAGE - The source is capable of microwatt power output in relatively small packages.    DETAILED DESCRIPTION - A thermoelectric power source comprises:    (a) a flexible substrate (140) having an upper surface; and    (b) a thermocouple comprising a sputter deposited thin film p-type thermoelement (120) positioned on the upper surface of the substrate, a sputter deposited thin film n-type thermoelement (110) positioned on the upper surface of the substrate adjacent the p-type thermoelement, and an electrically conductive member (105) positioned on the substrate and electrically connecting a first end (125) of the p-type thermoelement with a second end (130) of the n-type thermoelement.    An INDEPENDENT CLAIM is also included for a method of fabricating thermoelectric power sources, comprising:    (a) providing a flexible substrate;    (b) sputter depositing thin films of an n-type thermoelectric material onto the flexible substrate;    (c) sputter depositing thin films of a p-type thermoelectric material onto the flexible substrate; and    (d) forming thermocouples on the flexible substrate by electrically connecting the thin films of the p-type thermoelectric material to the thin films of the n-type thermoelectric materials.    DESCRIPTION OF DRAWING(S) - The figure illustrates a portion of n-type/p-type thermoelectric thin film modules.    Electrically conductive member (105)    Sputter deposited thin film n-type thermoelement (110)    Sputter deposited thin film p-type thermoelement (120)    First end (125)    Second end (130)    Flexible substrate (140)