Photocell Optimization Using Dark State Protection

Amir Fruchtman, Rafael Gómez-Bombarelli, Brendon W. Lovett, Erik M. Gauger

Research output: Contribution to journalArticle

14 Citations (Scopus)
93 Downloads (Pure)

Abstract

Photocells based on a simple optical transition suffer a fundamental efficiency threshold imposed by the principle of detailed balance, reflecting the fact that good absorbers must necessarily also be fast emitters. This limitation can be overcome by `parking' the energy of an absorbed photon in a `dark state' which neither absorbs nor emits light. Here we argue that suitable dark-states occur naturally as a consequence of the dipole-dipole interaction between two proximal optical dipoles for a wide range of realistic molecular dimers. We develop an intuitive model of a photocell comprising two light-absorbing molecules coupled to an idealised reaction centre, showing asymmetric dimers are capable of providing a significant enhancement of light-to-current conversion under ambient conditions. We conclude by presenting a host of candidate molecules meeting the requirements for realising such a system.
Original languageEnglish
Article number203603
JournalPhysical Review Letters
Volume117
Issue number20
DOIs
Publication statusPublished - 10 Nov 2016

Keywords

  • quant-ph
  • physics.chem-ph

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