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Where are you seeing 20-25% effi PV modules? The physics of silicon's bandgap prevents getting much above 18% without (expensive) multiple junction layers (of d
by obvious_throw 12y ago
Where are you seeing 20-25% effi PV modules? The physics of silicon's bandgap prevents getting much above 18% without (expensive) multiple junction layers (of different material) or concentrators, which tend to reduce module lifecycle time.