Computational study on optical transmittance of carbon nanotube-membrane for solar cell application
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Carbon nanotubes (CNTs) were considered as one of the promising materials in the application of solar cells due to their remarkable optical, electronic and mechanic properties. The optical transmittance of the CNT films was a crucial feature in solar cells, but the transmittance was strongly related to the thickness and porocity of the CNT layers of solar cells. Computational simulation was carried out to understand the optical transmittances and provide guidance for the design and fabrication of solar cells. A typical solar cell was investigated with a lamellar structure composed of CNT layers and ploy 3-octylthiophene (P3OT) layers. The computation results indicated the thickness, porocity and roughness of the CNTs layer have significant effect on optical transmittances in visible region (400nm -800nm). There exist optimized layer thickness and porocity to minimize incident-light loss for desired photovoltaic effect. Layer roughness leads to considerable fluctuation of optical transmittance. The simulation results were also compared with experimental measurements and showed a good consistence.
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