20 April 2010 New PV conversion phenomena on very high efficiency silicon devices for small footprint cells (automotive)
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Abstract
Progress in PV conversion efficiency requires optoelectronic breakthroughs. Completing one-step PV conversion by additional new low-energy mechanisms is one of the most important challenges of modern photovoltaics. Si is a basic PV material which cannot be efficient enough in its bulk or thin-film form because of its indirect bandgap. One way has been indicated by multi-interface solar cell on single-crystal Si combining nanostructured Si materials and device improvements leading to a PV metamaterial conditioned simultaneously both electrically and mechanically by the built-in electrical and local stress fields. This allows a two membrane-like conversion cycle where a nanoscale Si-layered system plays a specific role due to an active interface and crystalline defects. We demonstrate a step-like collection efficiency curve proving new low-energy (0.3 eV) carrier generation and multiplication has been measured under solar intensities on dedicated test structures.
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Zbigniew T. Kuznicki, Patrick Meyrueis, "New PV conversion phenomena on very high efficiency silicon devices for small footprint cells (automotive)", Proc. SPIE 7675, Photonics in the Transportation Industry: Auto to Aerospace III, 76750R (20 April 2010); doi: 10.1117/12.852687; https://doi.org/10.1117/12.852687
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