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Plasmonic multiple exciton generation
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DOI：10.1103/PhysRevMaterials.3.065201.png)
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We show that biexciton formation can be highly efficient in a solar cell whose semiconductor absorber is filled with an array of metallic nanoparticles having plasmonic resonances tuned to the semiconductor gap energy. This process can be viewed as a plasmon-enhanced multiple exciton generation, with the resulting cell efficiency exceeding the Shockley-Queisser limit. We demonstrate via theory and simulations that the efficiency of the process increases with decreasing semiconductor gap size, and illustrate such by considering in detail three systems with gradually decreasing gap size: GaAs, Si, and Ge.
Keyword:
ELECTRON
SILICON
NANOPARTICLES
EFFICIENCY
TRANSPORT
INJECTION
DYNAMICS
CARRIER
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