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Nanoparticle-induced enhancement and suppression of photocurrent in a silicon photodiode

机译:纳米粒子诱导的硅光电二极管中光电流的增强和抑制

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摘要

Nanoparticles are capable of both enhancing and suppressing the photocurrent in a silicon diode when deposited on the active face of the device. Photocurrent imaging of the individual nanoparticles and nanoparticle aggregates responsible for this effect reveals that Au nanospheres, nanoshells, and nanoshell dimers each exhibit unique wavelength-dependent suppression-enhancement characteristics. In contrast, silica nanospheres provide a sizable and relatively uniform photocurrent enhancement across the same spectral range, (532-980 nm). Unusual light-harvesting behavior observed correlates with a highly complex energy flow (optical "vortexing") for the forward scattered light, of plasmon resonant nanoparticles into the device.
机译:当纳米颗粒沉积在器件的有源面上时,它们能够增强和抑制硅二极管中的光电流。负责此作用的单个纳米颗粒和纳米颗粒聚集体的光电流成像显示,Au纳米球,纳米壳和纳米壳二聚体均表现出独特的依赖于波长的抑制增强特性。相反,二氧化硅纳米球在相同光谱范围(532-980 nm)范围内提供了相当大且相对均匀的光电流增强。观察到的不寻常的光收集行为与等离振子共振纳米粒子进入器件的前向散射光的高度复杂的能量流(光学“涡旋”)相关。

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