Abstract
An efficient inverted polymer solar cell (PSC)-based on bulk heterojunction composites of poly(3-hexylthiophene) (P3HT) and phenyl C61-butryricacid methyl ester (PCBM) has been demonstrated by incorporating facile low-temperature solution-processed Mg-doped SnO2 (Mg:SnO2) nanoparticles as the cathode interfacial layer. Compared to the pure SnO2, the PSCs based on Mg:SnO2 interfacial layer exhibits excellent properties with a power conversion efficiency (PCE) of up to 4.08%, increased from 2.77%, corresponding to a significant 47.29% PCE enhancement. The improved photovoltaic performance is ascribed to the increased electron mobility, elevated electrical conductivity and optimized surface morphology, which makes it an excellent growth platform for a flat and high quality photoactive layer. Furthermore, we show the Mg:SnO2 interfacial layers to dramatically improve the electron extraction and effectively suppress the photogenerated carrier recombination. The low-temperature solution-processed SnO2 with Mg d...
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