Exciton Lifetime Paradoxically Enhanced by Dissipation and Decoherence: Toward Efficient Energy Conversion of a Solar Cell

Yasuhiro Yamada, Youhei Yamaji, Masatoshi Imada

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6 Citations (Scopus)

Abstract

Energy dissipation and decoherence are at first glance harmful to acquiring the long exciton lifetime desired for efficient photovoltaics. In the presence of both optically forbidden (namely, dark) and allowed (bright) excitons, however, they can be instrumental, as suggested in photosynthesis. By simulating the quantum dynamics of exciton relaxations, we show that the optimized decoherence that imposes a quantum-to-classical crossover with the dissipation realizes a dramatically longer lifetime. In an example of a carbon nanotube, the exciton lifetime increases by nearly 2 orders of magnitude when the crossover triggers a stable high population in the dark excitons.

Original languageEnglish
Article number197701
JournalPhysical Review Letters
Volume115
Issue number19
DOIs
Publication statusPublished - 2015 Nov 6
Externally publishedYes

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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