Study of Sub-Wavelength Metallic Hole-Arrays on Electrode Layouts of Solar Cells
Date Issued
2011
Date
2011
Author(s)
Chi, Yi-Min
Abstract
The area of the metal electrode on a solar cell is an opaque region, and that causes the efficiency lost. In this study, we applied the surface plasmon resonance (SPR) phenomenon on electrodes of solar cells to improve the incident light collection. We designed the layout of metal electrodes to find the enhancement of efficiency on the solar cells. Utilizing the sub-wavelength metallic hole arrays to induced SPR phenomenon, the carrier could generate just below the electrode region, and via adjust the depth of P-N junction in device, the efficiency enhancement could be achieve.
We designed the devices with different contact window types, the arrangement of metallic hole arrays was simulated by Rigorous Coupled Wave Analysis (RCWA) and Three Dimensional Finite-Difference Time-Domain (3D-FDTD) methods. According to the simulation, we fabricated the device and found that the hexagonal hole array structure possesses better efficiency than other structures. Furthermore, the depth of P-N junction also affects the carrier generated ability. We measured and analyzed the device with different metal electrode area ration, and found that had an optimum condition between the ration of metal electrode and the ration of hole arrays. The normalized external quantum efficiency (EQE) also demonstrated the similar relation between ration of metal electrode area and efficiency. The efficiency enhancement in this study might come from the “effective cross section” increased for the SPR phenomenon.
Subjects
Solar cell
Electrode
Sub-wavelength hole arrays
Surface plasmon
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