Low-efficiency solar cells for educational purposes can be simply made in school or home environments using wet-chemistry techniques and readily available chemicals of generally low toxicity. Instructions are given for making solar cells based on the heterojunctions Cu/Cu 2 O, Cu 2 O/ZnO and Cu 2 S/ZnO, together with a modified Grätzel cell.
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Steve Appleyard (2006) studied this question.
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