Abstract
Organic p–i–n solar cells comprising metal-free phthalocyanine and fullerene, which was covered with an aluminum doped zinc oxide protection layer, were successfully operated for 42 days under white light (100 mW cm-2) irradiation. Decreases in the short-circuit photocurrent density and conversion efficiency during this period were just 3 and 5%, respectively. These results suggest that organic solar cells possess sufficient potential for practical long-term durability.