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This paper reports the recent results of improving the radiation hardness of silicon solar cells, which is SHARP and NASDA's project since 1998 (Tonomura et al., Second World Conference on Photovoltaic Solar Energy, 1998, pp. 3511-3514). Newly developed 2x2cm 2 Si solar cells with ultrathin substrates and both-side junction (BJ) structure showed 72.0mW (13.3% efficiency) maximum output power...
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