= Solution
One application is a \b[semiconducting nanotube transistor array]. Removing metallic tubes prevents conducting bridges that would bypass gate control; a narrow chirality distribution also narrows the spread of <band gaps> and switching behaviour. High <charge carrier mobility> and thin flexible channels are attractive, but <contact resistance>, tube alignment, residual metallic contamination, <dielectric> traps and the cost/yield of sorting still limit uniform large-area circuits.
A second is a \b[wavelength-selective near-infrared <photodetector> or emitter]. A selected chirality concentrates absorption and emission around its characteristic <nanotube optical transitions>, avoiding the broad mixed-tube response. Optical selectivity can be tailored by choosing the species. Limitations include low absolute emission yield, dark <exciton> states, contact-related recombination, environmental spectral shifts and quenching by bundles or metallic contaminants. Optical and electrical characterization after device processing is needed; the sorting label alone does not guarantee device performance.
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