Enhanced Absorption by SPR for Solar Cell Application
Date Issued
2007
Date
2007
Author(s)
Su, Chien Wei
DOI
en-US
Abstract
Surface plasmon resonance (SPR) is a unique light-matter hybrid interaction that will transfer absorbed incident light energy into local enhanced electric field at the interface of metal and dielectric materials. It is of great interest for a variety of applications in metallic nanoparticles such as artwork [1], biosensor [2], data storage, SERS [3], nanolithography [4], therapy [5], NIR-blocked window [6], solar cell, and other researches on subwavelength optics [7]-[8]. The SPR in metallic nanoparticles (say, particle plasmon) can be analyzed by Mie theory [9]. The peak absorption wavelength of particle plasmon can be controlled by nanoparticles’ size, shape, spacing, and local dielectric environment [10].
In this thesis, we will describe an engineered enhancement of optical absorption in an organic photovoltaic cell via the excitation of SPR in spherical Au nanoparticles deposited on a device surface. We deposited gold nanoparticles with 5 nm in diameter on ITO (indium tin oxide) glass substrates and then coated poly (styrenesulfonate) / poly(2,3-dihydro-thieno-1,4-dioxin) (PEDOT) which can reduce the work function of metal atoms and poly [2-methoxy-5-(2-ethylhexyloxy)-1, 4-phenylenevinylene] (MEHPPV) with Fullerene(C60) mixtures that work as p-type and n-type organic semiconductors, respectively.
We work on both Mie theory simulation and experimental confirmation. Simulation results will help us know more about SPR phenomenon in our case that we can predict its resonance peak and how large enhancement it is over visible range. In experiment part, we do the I-V curve measurement and spectrum response. The enhancement in electromagnetic field absorption within a device results in increased photocurrent response in organic p-n junction diodes with gold nanoparticles over wavelength ranges. Compared with the same organic photovoltaic structures without gold nanoparticles, the proposed device shows about 40% power efficiency improvement under halogen light illumination. Furthermore, the enhancement peak occurs near 335nm. This result answers well to the prediction of simulation, which convince us SPR really works in organic solar cell.
Finally, we introduce enhancement mechanism of electric field effect and heating effect. Because the mechanism has not been revealed clearly, we will investigate more about this topic in the future.
Subjects
表面電漿
有機太陽能電池
surface plasmon
organic solar cell
SDGs
Type
thesis
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