[20a-136-1~10] 13.9 Compound solar cells

[20a-136-7] Temperature characteristics and thermoelectric effect in heat recovery (HERC) solar cell

〇Kenji KAMIDE¹, Toshimitsu Mochizuki¹, Hidefumi Akiyama^2,3, Hidetaka Takato¹ (1.AIST, 2.ISSP, Univ. of Tokyo, 3.OPERANDO-OIL)

Keywords:solar cell, new concept, nonequilibrium

Recently, we proposed a concept of nonequilibrium solar cell "heat recovery (HERC) solar cell" whose theoretical efficiency limit can exceed the detailed-balance limit. HERC solar cell requires an absorber with the lattice temperature higher than those in the electrodes. As a result, it does not require fast carrier extraction within the thermalization time and thus can be realized in Si solar cell. This is a great advantage over conventional hot-carrier solar cells. In this presentation, we present our newly developed understanding of the energy-coversion mechanisms and give a clear answer to a question of why HERC solar cell exhibits positive temperature characteristics in contrast with conventional solar cells.