Abstract
The rectifying behavior and performance parameters of a hybrid organic/inorganic poly(3,4-ethylenedioxythiophene) polystyrene sulfonate/Si-doped GaN layer (PEDOT:PSS/Si:GaN) are studied. The characteristics of both organic and inorganic layers have been individually examined, and a heterojunction between the same has been realized. AFM studies on optimized samples reveal low surface roughness (~ 3.7 nm), and cross-sectional scanning electron microscopy images reveal uniform deposition of PEDOT:PSS layer over Si:GaN. The optimized heterojunction (thickness ~ 600 nm) presents a threshold voltage ~ 0.4 V with a rectifying behavior and a low ideality factor (n ~ 1.6) as compared to most of the related hybrid heterojunctions reported. The low ideality factor also points toward reduced trap-assisted tunneling and current leakage. A detailed comparison of heterojunction parameters including barrier height (ΦB) of the samples and ideality factor is also presented.
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