|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||2016 Functional Nanomaterials: Emerging Nanomaterials and Techniques for 3D Architectures
||V-2: Facile Synthesis of Water-soluble Graphene Quantum Dots/Graphene Hybrid Nanoplatelets as Efficient Photodetector
||J. Walden, Sanju Gupta
|On-Site Speaker (Planned)
Graphene quantum dots (GQDs) are a kind of 0D material with characteristics derived from both graphene and carbon dots (CDs). Intense research activity in GQDs is attributed to their novel phenomena of charge transport and light absorption/ emission over a large spectral window up to 6 eV, applicable for photonics and biomedical technologies. We present a facile hydrothermal method for synthesizing uniform sized GQDs with a strong green and blue emission at ~10-14% quantum yield. The structure and emission mechanism of the GQDs have been studied by combining extensive characterization techniques and rigorous control experiments. Here, we demonstrate high-efficient photocurrent (PC) behaviors of photodetectors (PDs) consisting of multiple-layer GQDs sandwiched between graphene sheets. The observed unique PD characteristics prove to be dominated by the tunneling of charge carriers through the energy states in GQDs, based on bias-dependent variations of the band profiles, resulting in novel dark current and PC behaviors.