  Thermoelectric energy harvesters can have a much higher conversion efficiency
by implementing quantum dots/wells between the high temperature region and the
low temperature region. However they still suffer a limitation of the maximum
output power, represented by the maximum $\Delta E$ (maximum energy gap of two
quantum dots/wells layers). In this work, we use the piezoelectric material in
the high temperature region, which has conceptually addressed the problem of
the maximum power limitation. Full analysis of device physics including
comparison with the existing technology and quantum simulation has been
conducted to validate this concept. Results show that with the new concept, the
maximum output power has been increased by at least an order of magnitude with
the same power input and identical device dimensions.
