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Polymer based organic solar cell offers a relatively inexpensive option for the future solar cell technology, provided its efficiency increases beyond the current limit of 4-6%. In this paper, we use the process and device models to explore the possibility of the efficiency improvement of the solar cell by ordered active layer morphology, obtained through template based fabrication technique. Our...
Intermediate band solar cell (IBSC) has a structure that absorbs the subbandgap photons by the help of the intermediate band (IB) located inside its base region and increases the photocurrent without decreasing the output voltage. In this study, detailed balance equations are used to investigate the current density (total, electron and hole currents) variations of IBSC with IB energy level, under...
We demonstrate the use of chirped porous-silicon broadband optical reflectors for thin-film epitaxial silicon solar cells. The benefits of chirped multilayer structures over conventional Bragg reflectors on the cell level are presented. By combining these chirped reflectors with shallow emitters, we show that both low- and high-energy photons are more effectively absorbed in the thin (20-mum ) epitaxial...
Solar cells represent a clean source of renewable energy. However, in order to make them competitive with traditional energy sources, the efficiency-to-cost ratio must be increased appreciably. Increases in power conversion efficiency have typically relied on iterative improvements in material quality (for both Si and non-Si systems) and/or device engineering aspects including, e.g., the use of tandem...
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