Single Molecule Quantum-Confined Stark Effect Measurements of Semiconductor Nanoparticles at Room Temperature

• DOI: 10.1021/nn303719m
• Publication Date: 2012-10-17T20:38:58Z
• Authors: KyoungWon Park; Zvicka Deutsch; J. Jack Li; Dan Oron; Shimon Weiss
• Keywords: Quantum-confined Stark effect; Nanorod

We measured the quantum-confined Stark effect (QCSE) of several types fluorescent colloidal semiconductor quantum dots and nanorods at single molecule level room temperature. These measurements demonstrate possible utility these nanoparticles for local electric field (voltage) sensing on nanoscale. Here we show that charge separation across one (or more) heterostructure interface(s) with type-II band alignment (and associated induced dipole) is crucial an enhanced QCSE. To further gain insight into experimental results, numerically solved Schrödinger Poisson equations under self-consistent approximation, including dielectric inhomogeneities. Both calculations experiments suggest degree initial exciton binding energy) determines magnitude QCSE in structures.