Abstract
Hybrid Solar Cells (HSC) applying Nb-TiO 2 in direct contact with a conducting organic polymer, MEH-PPV, show higher stability than the bare TiO 2-based HSC when analyzed under inert atmosphere conditions. IPCE analyses revealed that inert atmospheres affect directly the semiconductor oxide in the first stages of the analyses but photovoltaic performance stabilizes after several hours. A 20 wt% Nb-doped TiO 2 presented the highest stability and photovoltaic properties. The behavior has been attributed to the solubility limit of Nb within the TiO 2 beyond 20 wt% doping level where the co-existence of NbO 2 is observed. The HSCs were analyzed under controlled N 2 atmosphere and 1000 W/m 2 (AM 1.5) irradiation.
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