Impact of Defects on the Electronic Properties of (8,3) and (7,5) Carbon Nanotube Heterojunction

Carbon Nanotubes (CNTs) exhibit versatile electronic properties influenced by variations in their dimensions, chirality, and the number of CNTs. When CNTs of different chiralities form a heterojunction, the interface significantly affects their electronic properties. The circumferential, grouped, and distributed defects at the interface of (8,3) and (7,5) chiralities are simulated and the corresponding Density of States (DOS) and Zero-bias Transmission with respect to energy are analyzed. The comparison between the individual DOS and transmission of (8,3) and (7,5) chiralities and those of the defects generated on the interface reveals the impact of defects on energy states and transport properties. Notably at −0.3 eV, the grouped defect introduces a new energy state facilitating electron transmission at this lower energy level, which improves performance but also affects conductivity. This paper provides a detailed analysis of interface defects between (8,3) and (7,5) chiralities, highlighting their impact on energy levels and electronic properties, with results showing certain consistencies across different defects.