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Enhancement of optical absorption in thin-film solar cells through the excitation of higher-order nanoparticle plasmon modes. Opt Express

Advanced Photonics and Plasmonics Group, Institute of High Performance Computing, Singapore.
Optics Express (Impact Factor: 3.49). 07/2009; 17(12):10195-205. DOI: 10.1364/OE.17.010195
Source: PubMed

ABSTRACT Recent research in the rapidly emerging field of plasmonics has shown the potential to significantly enhance light trapping inside thin-film solar cells by using metallic nanoparticles. In this article it is demonstrated the plasmon enhancement of optical absorption in amorphous silicon solar cells by using silver nanoparticles. Based on the analysis of the higher-order surface plasmon modes, it is shown how spectral positions of the surface plasmons affect the plasmonic enhancement of thin-film solar cells. By using the predictive 3D modeling, we investigate the effect of the higher-order modes on that enhancement. Finally, we suggest how to maximize the light trapping and optical absorption in the thin-film cell by optimizing the nanoparticle array parameters, which in turn can be used to fine tune the corresponding surface plasmon modes.

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Available from: Wee Shing Koh, Aug 26, 2015
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    • "Wu et al. [21] proposed a MTMbased integrated plasmonic absorber/emitter for solar thermophotovoltaic systems. Akimov et al. [22] studied enhancement of optical absorption in thin-film solar cells through the excitation of higher-order nanoparticle Plasmon modes. Hashmi et al. [3] developed a theoretical model for MTM based solar cells, while, Liu et al. [23], also made a study of energy absorption on solar cells by using a MTM absorber. "
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    • "But if the immersion time is too long, the efficiency of the device decreases, although the increasing absorbs of light increases (Figure 5b). Larger particles along with larger surface coverage lead to increased parasitic absorption and reflection, reducing the desired optical absorption in SCNT film layer [48]. In addition, the particles embedded between SCNT and Si substrate will reduce the density of p-n junction and lead to a significantly decrease shunt resistance; therefore, the JSC and PCE decrease. "
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    • "Similar results were reported for Ag-NPs, deposited by thermal evaporation followed by annealing, on polished silicon with a 30 nm oxide layer, being a strong absorption observed for wavelengths above 1000 nm. There, it is shown the increase of absorption with increasing particle diameter1. Akimov et al.9 has also shown an enhancement of light absorption up to 59% when Al-NPs were deposited on the top of the TCO layer of a-Si:H solar cells. Nevertheless, our Au-NPs are embedded in a-Si:H film and the prove is the coincidence of TT and TSp spectra obtained by irradiating the samples from the glass side or from a-Si:H film side (reflectance was not shown also because no difference was observed). "
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