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High performance blue light detector based on ZnO nanowire arrays.

Organic-inorganic hybrid heterojunctions are ever so promising for low-cost and high-efficient photoelectric devices. We report a p-n junction diode composed of inorganic ZnO nanowire arrays (ZNAs) and organic 2, 2', 7, 7'-tetrakis-(N, N-di-p-methoxyphenylamine)- 9, 9'-spirobifluorene (spiro-MeOTAD). A maximum photoresponsivity of 1.32 mA/W is observed under illumination at zero bias. We also demonstrate that the photocurrent time response is observed to be rapid, consistent, as well as repeatable. On blue light weak irradiance (410 nm, 75  μW/cm2), the rise time constant and decay time constant were found to be 0.12 and 0.06 s, respectively. These results suggest ZNAs/spiro-MeOTAD heterojunction as a candidate for an efficient self-powered blue light detector.