Ultrahigh performance C60 nanorod large area flexible photoconductor devices via ultralow organic and inorganic photodoping

Abstract

One dimensional single-crystal nanorods of C 60 possess unique optoelectronic properties including high electron mobility, high photosensitivity and an excellent electron accepting nature. In addition, their rapid large scale synthesis at room temperature makes these organic semiconducting nanorods highly attractive for advanced optoelectronic device applications. Here, we report low-cost large-area flexible photoconductor devices fabricated using C 60 nanorods. We demonstrate that the photosensitivity of the C 60 nanorods can be enhanced ∼400-fold via an ultralow photodoping mechanism. The photodoped devices offer broadband UV-vis-NIR spectral tuneability, exhibit a detectivitiy >10 9 Jones, an external quantum efficiency of ∼100%, a linear dynamic range of 80 €...dB, a rise time 60 €...μs and the ability to measure ac signals up to ∼250 €...kHz. These figures of merit combined are among the highest reported for one dimensional organic and inorganic large-area planar photoconductors and are competitive with commercially available inorganic photoconductors and photoconductive cells. With the additional processing benefits providing compatibility with large-area flexible platforms, these devices represent significant advances and make C 60 nanorods a promising candidate for advanced photodetector technologies.