| Summary: | 碩士 === 國立交通大學 === 光電工程研究所 === 104 === Hybrid organic-silicon solar cells, which combine the advantages of both inorganic and organic solar cells, are promising candidates for next-generation photovoltaics due to their low cost, simple fabrication processes and potential for high power conversion efficiency. Nanoscale surface texture is important for Hybrid organic-silicon solar cells in order to enhance optical absorption for thin-silicon substrates, as well as to increase the junction area for collection of charge carriers. In this study, we employee nanosphere lithography and metal assisted chemical etching (MACE) techniques to fabricate pencil-shaped nanorod structures. By using different kinds of oxidants and tuning the relative concentration ratios, we successfully fabricate pencil rod structure which shows a low weighted reflectance of 7.4% due to the graded-refractive-index effect. The reflectance is largely suppressed due to the modulation of the tapered top surface morphology, which helps to elongate the light absorption path. Moreover, the tapered tips of the pencil rods can boost the organic coverage ratio for carrier separation and collection, thereby effectively increasing the short-circuit-current, Jsc. Moreover, by passivating the rear and front nanorod surfaces with an ultra-thin aluminum oxide, 15Å and 3Å respectively, using atomic layer deposition (ALD) technique to produce as a passivation layer on substrate front and back side. B, We successfully boost the open-circuit voltage and achieve a power conversion efficiency (PCE) of 13.61%. We expect that the device performance can be further enhanced by full organic surface coverage on pencil rod structures to benefit from superior optical absorption and carrier collection with the enlarged junction area. Finally, we hope to fabricate pencil rod structure on thin substrates to reduce the material cost.
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