Optimization of plasmonic cavity-resonant multijunction cells

Shih-Chun Lin, Sze Ming Fu, Yan Kai Zhong, Chi Wei Tseng, Shih Yun Lai, Timothy Ching Kwok Lau

Research output: Contribution to journalArticlepeer-review


Improving spectral photon harvesting is important for thin-film multijunction cells. We show that efficient spectral flux management can be achieved using genetic algorithm-optimized surface plasmon (SP) cavity- resonant type multijunction cells. We also observe that the excitation of the SP quasi-guided mode, Fabry-Perot mode, and SP polariton significantly enhance the photocurrent of multijunction cells. Two types of cavity structures are investigated. For the optimized SP intermediate reflector and bottom-grating cavity, the resonant cavity mode efficiently increases the long-wavelength absorption in the bottom cell by 63.27%, resulting in reduced absorbance asymmetry between the top and the bottom cells. Accordingly, the matched integrated absorbance is increased by 14.92%. For the optimized SP top- and bottom-grating (TBG) cavity, the integrated absorbance and current matching are improved due to the higher transmission through the solar cell front surface and the excitation of the quasi-guided mode with a more localized field in the bottom cell. The matched integrated absorbance is improved by 85.68% for the TBG cavity.

Original languageEnglish
Article number121326
JournalOptical Engineering
Issue number6
StatePublished - 23 Jul 2013

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