  We theoretically investigate the Seebeck and Peltier effect across an
interacting quantum dot(QD) coupled between a normal metal and a
Bardeen-Cooper-Schrieffer superconductor within the Coulomb blockade regime.
Our results demonstrate that the thermoelectric conversion efficiency at
optimal power output (optimized with respect to QD energy level and external
serial load) in NQDS nanodevice can reach up to $58\%\eta_C$, where $\eta_C$ is
Carnot efficiency, with output power $P_{max}\approx 35fW$ for temperature
below the superconducting transition temperature. Further, the Peltier cooling
effect is observed for a wide range of parameter regimes, which can be
optimized by varying the background thermal energy, QD level energy,
QD-reservoir tunneling strength, and bias voltage. The results presented in
this study are within the scope of existing experimental capabilities for
designing miniature hybrid devices that operate at cryogenic temperatures.
