Delocalized quantum states enhance photocell efficiency

Author(s): Yiteng Zhang ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Sangchul Oh ¹ ^, ² ^, ³ ^, ⁴ , Fahhad H. Alharbi ¹ ^, ² ^, ³ ^, ⁴ , Gregory S. Engel ⁵ ^, ⁶ ^, ⁷ ^, ⁸ , Sabre Kais ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵

Publication date (Electronic): 2015

Journal: Physical Chemistry Chemical Physics

Publisher: Royal Society of Chemistry (RSC)

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Abstract

The high quantum efficiency of photosynthetic complexes has inspired researchers to explore new routes to utilize this process for photovoltaic devices.

Abstract

The high quantum efficiency of photosynthetic complexes has inspired researchers to explore new routes to utilize this process for photovoltaic devices. Quantum coherence has been demonstrated to play a crucial role in this process. Herein, we propose a three-dipole system as a model of a new photocell type which exploits the coherence among its three dipoles. We have proved that the efficiency of such a photocell is greatly enhanced by quantum coherence. We have also predicted that the photocurrents can be enhanced by about 49.5% in such a coherent coupled dipole system compared with the uncoupled dipoles. These results suggest a promising novel design aspect of photosynthesis-mimicking photovoltaic devices.