Minimized electrical loss and maximized absorption for efficiency enhancement, advanced structure is desired. Surface photonic nano structure as transition layer or higher band gap active layer with higher surface absorption trend, which one is more efficient in all respect
Please specify your question "which is best option?" -- "best" with respect to what criterion / issue / goal / ...?
OK; so probably by "SPV" (in your question) you mean "silicon photovoltaics" (as in http://ijiset.com/vol3/v3s2/IJISET_V3_I2_42.pdf) and not "surface photovoltage" (as in http://isc-konstanz.de/fileadmin/doc/24EU-PVSEC/KPeter.pdf), right?
Further questions: Are you more interested in practical aspects, so that questions like "How much money could be spend: rather limited . . . arbitrarily much?" or "Would be clean room equipment and chemicals at hand?" are of relevance for you as constraints, or are you more interested in the fundamental theoretical aspect of how to achieve higher efficiency in principle?
yes let me know first about fundamental theoretical aspect of how to achieve higher efficiency in principle?
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