Abstract
We report enhanced photonic effects on InP nanowires (NWs) upon conformal coating with parylene-C polymer. The InP NWs were grown and measured on transparent glass substrates, which allows the study of light transmission, reflectance and absorption. The conformal coating strongly affected the interaction between the nanowires and light. The photoluminescence (PL) intensity was increased by a factor of ~7 with 50–200 nm thick parylene-C coating on nominally 40 nm thick NWs. Similar carrier lifetimes were obtained for coated and uncoated NWs in time-resolved PL measurements, which points towards absent surface passivation. Therefore, the PL intensity enhancement is likely due to photonic effects. Investigation on reflectance, transmission and absorption revealed that the conformal polymer coating greatly increased diffuse reflection and decreased transmission. The presented results expand the knowledge and available tools for light management in NW ensembles, and thus pave way for advances in NW-based photonic and optoelectronic components.
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