Electrolyte-gated field effect transistor to probe the surface defects and morphology in films of thick CdSe colloidal nanoplatelets.

摘要: The optical and optoelectronic properties of colloidal quantum dots strongly depend on the passivation their surface. Surface states are however difficult to quantify using spectroscopy techniques based back gated field effect transistors limited in range carrier density that can be probed, usually significantly below one charge per particle. Here we show electrolyte gating used quantitatively analyze increase defects a population nanoparticles with increasing surface irregularities. We illustrate this method CdSe nanoplatelets grown thickness low temperature layer-by-layer method. Spectroscopic analysis samples confirm nanoplatelet is controlled, average, atomic precision, but structural transmission electron microscopy shows number increases thickness. amount probed el...