Monolayer Quantum-Dot Based Light-Sensor by a Photo-Electrochemical Mechanism

Micromachines

SungJong Yoo¹  Minjik Kim²  SitansuSekhar Nanda²  DongKee Yi²  GeorgiaC. Papaefthymiou³ 

[1] Center for Hydrogen·Fuel Cell Research, Korea Institute of Science and Technology, Hwarang-ro, 14-gil, Seoul 02792, Korea;Department of Chemistry, Myongji University, Yongin-si 17058, Korea;Department of Physics, Villanova University, Villanova, PA 19085, USA;

关键词: CdSe;    quantum dots;    capacitor;    semiconductor electrode;    photo-sensor;   

DOI  :  10.3390/mi11090817

来源: DOAJ

【 摘 要 】

Monolayer nanocrystal-based light sensors with cadmium-selenium thin film electrodes have been investigated using electrochemical cyclic voltammetry tests. An indium tin oxide electrode system, with a monolayer of homogeneously deposited cadmium-selenium quantum dots was proven to work as a photo-sensor via an electrochemical cell mechanism; it was possible to tune current densities under light illumination. Electrochemical tests on a quantum dot capacitor, using different sized (red, yellow and green) cadmium-selenium quantum dots on indium tin oxide substrates, showed typical capacitive behavior of cyclic voltammetry curves in 2M H₂SO₄ aqueous solutions. This arrangement provides a beneficial effect in, both, charge separation and light sensory characteristics. Importantly, the photocurrent density depended on quantum yield rendering tunable photo-sensing properties.

【 授权许可】

Unknown