The effects of a Si-rich silicon oxide (SRO) layer containing silicon nanocrystals as photoluminescence down-shifter layer on a conventional Si solar cell were investigated. Two SRO layers with different thicknesses but same composition were deposited on top of Si solar cells by plasma-enhanced chemical vapor deposition and followed by high temperature annealing to precipitate silicon nanocrystals. The SRO layers absorb efficiently high energy photons (especially higher than twice Si bandgap) and emit photons at longer wavelength, which are in turn absorbed by Si. A relative increase of about 14% to the internal quantum efficiency has been observed.
Silicon nanocrystals as a photoluminescence down shifter for solar cells / Zhizhong Yuan;Georg Pucker;Alessandro Marconi;Fabrizio Sgrignuoli;Aleksei Anopchenko;Yoann Jestin;Lorenza Ferrario;Pierluigi Bellutti;Lorenzo Pavesi. - In: SOLAR ENERGY MATERIALS AND SOLAR CELLS. - ISSN 0927-0248. - ELETTRONICO. - 95:(2011), pp. 1224-1227. [10.1016/j.solmat.2010.10.035]
Silicon nanocrystals as a photoluminescence down shifter for solar cells
SGRIGNUOLI, FABRIZIO;
2011
Abstract
The effects of a Si-rich silicon oxide (SRO) layer containing silicon nanocrystals as photoluminescence down-shifter layer on a conventional Si solar cell were investigated. Two SRO layers with different thicknesses but same composition were deposited on top of Si solar cells by plasma-enhanced chemical vapor deposition and followed by high temperature annealing to precipitate silicon nanocrystals. The SRO layers absorb efficiently high energy photons (especially higher than twice Si bandgap) and emit photons at longer wavelength, which are in turn absorbed by Si. A relative increase of about 14% to the internal quantum efficiency has been observed.
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