Nonlinear transport in carbon quantum dot electronicd evices: Experiment and theory
Copeland,S.; Ryu, S.; Imai, K.; Krasco, N.; Lu, Z.; Sánchez, D.; Czubarow, P.
Applied Physics Letters 126, 232104 (1-5) (2025)
Applied Physics Letters 126, 232104 (1-5) (2025)
Carbon quantum dots (CQDs) are a promising material for electronic applications due to their easy fabrication and interesting
semiconductor properties. Further, CQDs exhibit quantum confinement and charging effects, which may lead not only to improved
performances but also to devices with novel functionalities. Here, we investigate the electronic transport of CQDs embedded on epoxy
polymer. Our samples are coupled to interdigitated electrodes with individually addressable microelectrodes. Remarkably, the current–
voltage characteristics show strongly nonlinear regimes at room temperature, ranging from Schottky diode to Coulomb blockade and even
negative differential conductance (NDC) behavior. We propose a master equation theoretical framework which allows us to compute current
curves that agree well with the observations. This model emphasizes the importance of interacting dots and electron traps in generating a
cohesive picture that encompasses all transport regimes. Overall, our results suggest that CQDs constitute a versatile materials platform for
3D integrated electronic purposes.
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