Amplification in Light Energy Conversion at Q-CdTe Sensitized TiO2 Photonic Crystal, Photoelectrochemical Stability in Se2– Electrolyte, and Size-Dependent Type II Q-CdTe/CdSe Formation
| Autor: | Ali S. Nehme, Lara I. Halaoui, Fatima Haydous |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Chemistry
Nanotechnology 02 engineering and technology Electrolyte Photoelectrochemical cell 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Binding constant Cadmium telluride photovoltaics 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Absorbance General Energy Quantum dot law Solar cell Physical and Theoretical Chemistry 0210 nano-technology Photonic crystal |
| Zdroj: | The Journal of Physical Chemistry C. 120:4766-4778 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.5b11478 |
| Popis: | This study investigates the ability of Se2– redox electrolyte to separate the photoholes and stabilize Q-CdTe quantum dot solar cell with a liquid junction. We examined the photophysical and photoelectrochemical behaviors of Q-CdTe in two sizes, green-emitting dots of 2.3–2.7 nm diameter and red-emitting dots of 4 nm diameter, in the presence of alkaline Se2– electrolyte prepared under inert atmosphere. Photoelectrochemical, absorbance, emission and emission quenching measurements revealed the presence of size dependence in Se2– surface binding to Q-CdTe, growth of type II Q-CdTe/CdSe, and stability in the photoelectrochemical cell. Emission quenching measurements show that Se2– scavenges the Q-CdTe photohole, with mechanisms that depended on size and quencher concentration. Binding of Se2– to green-emitting Q-CdTe occurred with a greater binding constant compared to the red-emitting dots, resulting in formation of type II Q-CdTe/CdSe at the smaller core indicated in red-shifted absorbance and emission sp... |
| Databáze: | OpenAIRE |
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