Lossless holographic spectrum splitter in lateral photovoltaic devices

Author

Lin, D. ; Torrey, E. ; Leger, J. ; Cohen, P.

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of Minnesota, Minneapolis, MN, USA

fYear

2011

fDate

19-24 June 2011

Abstract

A lossless holographic spectrum splitter is proposed for partitioning the solar spectrum into two segments in a two-cell lateral photovoltaic (PV) device. The holographic splitter is used to redirect the majority of high energy photons to a high band-gap PV cell. A low band-gap PV cell is positioned to collect any remaining high energy photons along with the low energy photons. The optimal spectral characteristics of the holographic spectrum splitter, implemented using two multiplexed volume phase gratings, and the optimal band-gap energies of the two lateral PV cells are simultaneously obtained through a detailed balance analysis. With arbitrary band-gap energies and a concentration of 100 suns, the overall efficiency of the proposed lateral PV cell architecture can reach as high as 45% under the AM 1.5 direct-plus-circumsolar spectrum.

Keywords

photons; solar cells; band-gap PV cell; direct-plus-circumsolar spectrum; high energy photons; lateral photovoltaic devices; lossless holographic spectrum splitter; multiplexed volume phase gratings; solar spectrum; two-cell lateral PV device; two-cell lateral photovoltaic device; Computer architecture; Diffraction; Diffraction gratings; Gratings; Microprocessors; Multiplexing; Photonic band gap;

fLanguage

English

Publisher

ieee

Conference_Titel

Photovoltaic Specialists Conference (PVSC), 2011 37th IEEE

Conference_Location

Seattle, WA

ISSN

0160-8371

Print_ISBN

978-1-4244-9966-3

Type

conf

DOI

10.1109/PVSC.2011.6186096

Filename

6186096