Assertion: solar cell's efficiency | /r/HasProperty | 1.5 irradiation
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text: They demonstrated efficiency of 7–10% under AM 1.5 irradiation using nanocrystalline (nc) TiO 2 thin-film electrode with nanoporous structure and large surface area, and used a novel Ru bipyridyl complex as a sensitizer and an ionic redox electrolyte at EPFL .