Since the solar irradiance within a day is varying, the temperature of the photovoltaic–thermoelectric
(PV–TE) system becomes fluctuant with the change of the incident solar irradiance, which exerts a significant
influence on the efficiency of the total system. In this paper, the phase change material (PCM)
is introduced into the PV–TE system to construct a novel PV–PCM–TE hybrid system. The purposes of
applying PCM are to mitigate the temperature fluctuations of the PV cell and the TE modules and keep
the hybrid PV–TE system operating under a fixed operating condition. A theoretical model of evaluating
the efficiency of the concentrating PV–PCM–TE hybrid system is presented. The feasibility of the
PV–PCM–TE system with four types of PV cells, c-Si, CIGS, single-junction GaAs, and GaInP/InGaAs/Ge
(III–V), are investigated. The optimum operating conditions which indicate that the PV–PCM–TE system
has the highest total efficiency are discussed to determine the melting temperatures of PCMs. A series of
structure parameters are designed to obtain the optimized parameters for the PV–PCM–TE system, and
the influences of these parameters on the PV–PCM–TE system are investigated. The results indicate that
the performance of the PV–PCM–TE system is superior to single PV cells and/or PV–TE systems.
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