Abstract
Low-dimensional organic materials have attracted intense attention due to their potential applications in low-cost, flexible electronics and optoelectronics. C60 has shown promise for high-performance photodetectors due to its strong light-matter interactions. However, limited by its poor crystallinity on oxide substrates and short exciton diffusion length, the potential of pristine C60 as photodetector channel material has not been fully exploited. Here, we fabricated a graphene-C60-graphene photoconductor, where well-crystallized C60 film is obtained on a hexagonal boron nitride (h-BN) template and the two graphene sheets function as source and drain electrodes. The all-carbon device covers ultraviolet (UV) to near-infrared (200–800 nm), and the photoresponsivity reaches up to 5510 A W−1@360 nm and 2280 A W−1@405 nm, with an operating bandwidth of ∼6 kHz. In addition, the gate-tunable graphene/C60 interface barrier enables an adjustable responsivity. Our results confirm the potential of pristine C60 as highly-sensitive photon sensor and video-frame-rate imaging application for the UV-Visible band.
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