Abstract
To realize substantial performance enhancement in the poly (3-hexylthiophene)/[6, 6]-pheny-C71-butyric acid methyl ester (P3HT/PC71BM)-based organic optoelectronic devices, a discontinuous layer consisting of nickel nanoparticles (Ni NPs) was introduced to embellish the indium tin oxide electrode. When the Ni layer with a thickness of 3 nm was introduced, photocurrent gain was enhanced nearly 300% at low bias without sacrificing any response speed in the obtained organic photodetectors, and power conversion efficiency of organic solar cells increased nearly by 30%. The improved performance of the polymer photodetectors was mainly attributed to the injection of secondary electrons due to hole trap states introduced by the poor interfacial contact between the active layer and the Ni layer. On the other hand, the incident light was scattered over a longer propagation path by Ni NPs in the active layer, and therefore, the performance of polymer solar cells was enhanced.
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