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Maximized Optical Absorption in Ultrathin Films and Its Application to Plasmon-Based Two-Dimensional Photovoltaics

Carl Hägglund (Institutionen för teknisk fysik, Kemisk fysik) ; S. Peter Apell (Institutionen för teknisk fysik, Kondenserade materiens teori) ; Bengt Kasemo (Institutionen för teknisk fysik, Kemisk fysik)
Nano Letters (1530-6984). Vol. 10 (2010), 8, p. 3135-3141.
[Artikel, refereegranskad vetenskaplig]

For ultrathin films of a given material, light absorption is proportional to the film thickness. However, if the optical constants of the film are chosen in an optimal way, light absorption can be high even for extremely thin films and optical path length. We derive the optimal conditions and show how the maximized absorptance depends on film thickness. It is then shown that the optimal situation can be emulated by tuning of the geometric parameters in feasible nanocomposites combining plasmonic materials with semiconductors. Useful design criteria and estimates for the spatial absorption-distribution over the composite materials are provided. On the basis of efficient exchange of oscillator strength between the plasmonic and semiconductor constituents, a high quantum yield for semiconductor absorption can be achieved. The results are far-reaching with particularly promising opportunities for plasmonic solar cells.

Nyckelord: Absorption limit, ultrathin films, effective medium, localized surface plasmon resonances, solar cells, plasmon enhancement, light absorption

Denna post skapades 2010-08-27. Senast ändrad 2014-03-24.
CPL Pubid: 125307


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Institutioner (Chalmers)

Institutionen för teknisk fysik, Kemisk fysik (1900-2015)
Institutionen för teknisk fysik, Kondenserade materiens teori (1900-2015)



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