Two-step photon up-conversion solar cell using quantum dots embedded beneath the hetero-interface

Abstract

Herein, we present the basic idea of a two-step photon up-conversion solar cell, along with the theoretically calculated conversion efficiency and experimental results of a high-efficiency solar cell, proposed by us based on the above concept. The experimental results have demonstrated that the insertion of a quantum-dots layer beneath a semiconductor hetero-interface improves the efficiency of intraband transition (photon up-conversion) occurring at the hetero-interface. Finally, our ongoing efforts to realize low-cost, high-efficiency two-step up-conversion solar cells are presented.