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High‐performance inverted solar cells using various low‐bandgap polymers are achieved by using excellent metal oxide nanoparticles including ZnO and TiO2:Cs nanoparticles as an electron‐transport layer (ETL). Power conversion efficiencies (PCE) as high as 7.3% are achieved with inverted single cells based on PTB7:PC71BM. The results give a guideline for high‐efficiency and stable inverted single‐junction...
An MoO3 film spin‐coated from a solution prepared by an extremely facile and cost‐effective synthetic method is introduced as an anode buffer layer of bulk‐heterojunction polymer photovoltaic devices. The device efficiency using the MoO3 anode buffer layer is comparable to that using a conventional PEDOT:PSS layer without annealing at an elevated temperature.
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