Multiple exciton generation in quantum dots versus singlet fission in molecular chromophores for solar photon conversion

Author:

Beard Matthew C.1,Johnson Justin C.1,Luther Joseph M.1,Nozik Arthur J.12

Affiliation:

1. National Renewable Energy Laboratory, Golden, CO 80401, USA

2. Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO 80309, USA

Abstract

Both multiple exciton generation (MEG) in semiconductor nanocrystals and singlet fission (SF) in molecular chromophores have the potential to greatly increase the power conversion efficiency of solar cells for the production of solar electricity (photovoltaics) and solar fuels (artificial photosynthesis) when used in solar photoconverters. MEG creates two or more excitons per absorbed photon, and SF produces two triplet states from a single singlet state. In both cases, multiple charge carriers from a single absorbed photon can be extracted from the cell and used to create higher power conversion efficiencies for a photovoltaic cell or a cell that produces solar fuels, like hydrogen from water splitting or reduced carbon fuels from carbon dioxide and water (analogous to biological photosynthesis). The similarities and differences in the mechanisms and photoconversion cell architectures between MEG and SF are discussed.

Publisher

The Royal Society

Subject

General Physics and Astronomy,General Engineering,General Mathematics

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