Tailored Near infrared Colloidal Heterostructured Quantum Dots for High Performance Photoelectrochemical Cells
Colloidal heterostructured CuGaS2 (CGS)/CdS core/shell quantum dots (QDs) with a wurtzite (WZ) phase were synthesized via a facile two step technique. As compared to the bare CGS QDs, the optical properties of such heterostructured CGS/CdS core/shell QDs were tailored to show largely enhanced light absorption in the visible range and an emission peak in the near infrared (NIR) region at a wavelength of ~816 nm. As proof of concept, these core/shell QDs were used as light absorbers to fabricate a photoelectrochemical (PEC) cell, which exhibited a maximum saturated photocurrent density of ~6.5 mA cm 2 and outstanding stability under standard one sun illumination (AM 1.5G, 100 mW cm 2) The results indicate that these NIR core/shell QDs are promising candidates for future QD based optoelectronic technologies such as QD sensitized solar cells (QDSCs)