Light trapping is particularly critical for thin-film amorphous Si a-Si: In this thesis we explore the use of designed plasmonic nanostructures to couple incident sunlight into localized resonant modes and propagating waveguide modes of an ultrathin semiconductor for enhanced solar-to-electricity conversion.
Plasmonic-electrical solar cells[ edit ] Having unique features of tunable resonances and unprecedented near-field enhancement, plasmon is an enabling technique for light management.
The second part of this thesis describes the integration of plasmonic nanos- tructures with a-Si: With the use of common and safe materials, third generation solar cells should be able to be Plasmonic solar cells thesis in mass quantities further reducing the costs. Most solar cell systems face a trade-off with decreasing semiconductor thickness: These devices are not as efficient, but the price, size and power combined allow them to be just as cost effective.
These results demonstrate the feasibility and prospect of achieving high-efficiency ultra-thin silicon wafer cells with plasmonic light trapping. The danger in using lines instead of dots would be creating a reflective layer which would reject light from the system.
One material which has a large bandgap of phonons is indium nitride. The improvements are mainly attributed to the plasmonic-optical effects for manipulating light propagation, absorption, and scattering.
This requires a small bandgap. Light trapping in plasmonic solar cells Citation Ferry, Vivian Eleanor Light trapping in plasmonic solar cells.
We then show the potential of this method to result in absorption enhancements beyond the limits for thick film solar cells.
In other words, the transport time of electrons and holes from initial generation sites to corresponding electrodes should be the same. The idea behind the hot carrier cell is to utilize some of that incoming energy which is converted to heat.
If the electrons and holes can be collected while hot, a higher voltage can be obtained from the cell. By controlling and designing the complex dielectric function and nanoscale geometry we can affect the coupling of light into specific active materials and tune macroscale properties such as reflection, transmission, and absorption.
Each thin film solar cell would have a different band gap which means that if part of the solar spectrum was not absorbed by the first cell then the one just below would be able to absorb part of the spectrum.
Recently, performances of thin-film solar cells have been pronouncedly improved by introducing metallic nanostructures. Lower quality materials that use cheaper deposition processes are being researched as well. The shell is metallic and support surface plasmon resonances.
This would help by utilizing a larger area of the surface of the solar cell for light scattering and absorption. They also demonstrated the breaking of space charge limit in plasmonic-electrical organic solar cell.
The way third generation solar cells will be able to improve efficiency is to absorb a wider range of frequencies. Since the processes are simpler and the materials are more readily available, the mass production of these devices is more economical.
Using a selective contact, the lower energy electrons and holes can be collected while allowing the higher energy ones to continue moving through the cell.The scattering from metal nanoparticles near their localized plasmon resonance is a promising way of increasing the light absorption in thin-film solar cells.
Enhancements in photocurrent have been observed for a wide range of semiconductors and solar cell configurations. We review experimental and theoretical progress that has been made in recent years, describe the basic mechanisms at work.
Low-Cost High-Efficiency Solar Cells with Wafer Bonding and Plasmonic Technologies Thesis by Katsuaki Tanabe In Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy California Institute of Technology Pasadena, California PLASMONIC SOLAR CELLS Plasmonic solar cells (SCs) have great potential to drive down the cost of solar power.
To make SC a viable energy source, trapping of light is crucial for thin fi lm SCs. So, plasmonic nanoparticles could be used to increase the effi ciency of thin fi lm SCs.
A comprehensive study of the plasmonic thin-film solar cell with the periodic strip structure is presented in this paper. The finite-difference frequency-domain method is employed to discretize the inhomogeneous wave function for modeling the solar cell. In particular, the hybrid absorbing boundary condition and the one-sided difference scheme are adopted.
A plasmonic-enhanced solar cell is a type of solar cell (including thin-film, crystalline silicon, amorphous silicon, and other types of cells) that convert light into electricity with the assistance of plasmons.
The second part of this thesis describes the integration of plasmonic nanos- tructures with a-Si:H solar cells, showing that designed nanostructures can lead to enhanced photocurrent over randomly textured light trapping surfaces, and develops a computational model to accurately simulate the absorption in these structures.Download