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Surface Plasmon Enhancement Of Organic Photovoltaic Devices, Megan Holtz
Surface Plasmon Enhancement Of Organic Photovoltaic Devices, Megan Holtz
Physics & Astronomy Honors Theses
Organic photovoltaic (OPV) cells have recently attracted attention due to their low cost and easy fabrication. However, their efficiency remains low compared to silicon-based photovoltaics. OPV cells generate power through the creation of an exciton by light. The diffusion length for the electron-hole pair in most organic photovoltaic material is on the order of 100 nm, which limits the overall thickness of the device. The maximum 100 nm thickness of the cell reduces the absorption of the device, which ultimately lowers its efficiency. The absorption may be boosted at certain wavelengths by the excitation of surface plasmons. Surface plasmons are …
The Elemental Composition And The Spatial Distributions Of Elements In The Crab Nebula, Timothy J. Satterfield
The Elemental Composition And The Spatial Distributions Of Elements In The Crab Nebula, Timothy J. Satterfield
Physics & Astronomy Honors Theses
We present new observations and photoionization calculations for investigating gaseous regions that represent expected nuclear processing in the Crab Nebula supernova remnant. High helium abundance is shown to cause a very efficient [N II] ¸¸6548,6583 emitting zone which can account for some strong nitrogen emission. This high helium abundance causes strong emission of [C I] ¸¸9823,9850. When emission line measurements are compared with model simulations, most of the nebular gas appears to have depleted or solar nitrogen and enhanced carbon. This argues for a precursor star that had a mass greater than 9.5M¯. We also use images of selected emission …