UM File # 5098

Background
Plasmonic structures consisting of metallic nanoparticles (MNPs) have been shown to increase the external quantum efficiency of thin-film photovoltaics (PVs). However, in most designs, the plasmonic structures are placed within the optical or electrical paths of PV devices. Non-radiative recombination around the MNPs can cause additional metal absorption and reduced open-circuit voltage, thereby negating the positive effects of the plasmonics.

Technology Description
Researchers at the University of Michigan have developed a technology that places plasmonic structures outside the optical and electrical paths. The new technology enables enhanced light harvesting, and results in a two-fold increase in photocurrent and a higher open-circuit voltage. Further, using an optical spacer, the plasmonic backscattering can be spectrally controlled, thereby modulating the external quantum efficiency and photocurrent.

Applications
• Higher efficiency solar cells
• Semi-transparent and multi-junction PV applications

Advantages
• 2x increase in photocurrent
• Higher open-circuit voltage
• Spectral control of plasmonic backscattering

File Number: 5098