TITLE

Cavity-controlled radiative recombination of excitons in thin-film solar cells

AUTHOR(S)
Vuong, Luat T.; Kozyreff, Gregory; Betancur, Rafael; Martorell, Jordi
PUB. DATE
December 2009
SOURCE
Applied Physics Letters;12/7/2009, Vol. 95 Issue 23, p233106
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We study the performance of photovoltaic devices when controlling the exciton radiative recombination time. We demonstrate that when high-quantum-yield fluorescent photovoltaic materials are placed within an optical cavity, the spontaneous emission of the radiative exciton is partially inhibited. The corresponding increase of the exciton lifetime results in an increase of the effective diffusion length and diffusion current. This performance maximizes when the thickness of the cell is comparable to the absorption length. We show that when typical parameter values of thin solar-cell devices are used, the efficiency may improve by as much as three times.
ACCESSION #
46708411

 

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