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The interfacial structure in “giant” PbS/CdS quantum dots (QDs) was engineered by modulating the Cd:S molar ratio during in situ growth. The control of the gradient interfacial layer could facilitate hole transfer, regulate the transition from double- to single-color emission, as a consequence. These QDs are optically active close-to-the near-infrared (NIR) spectral region and are candidates as absorber materials in solar energy conversion. Photoinduced charge transfer from “giant” QDs to electron scavenger can still take place despite the ultra-thick (~5 nm) shell. The hybrid architecture based on a TiO2 mesoporous framework sensitized by the “giant” QDs with alloyed interface can produce a saturated photocurrent density as high as ~5.3 mA/cm2 in a photoelectrochemical (PEC) cell under 1 Sun illumination, which is around 2 times higher than that of bare PbS and core/thin-shell PbS/CdS QDs sensitizer. The as …
Publication date: 
1 Dec 2016

Lei Jin, Gianluca Sirigu, Xin Tong, Andrea Camellini, Andrea Parisini, Giuseppe Nicotra, Corrado Spinella, Haiguang Zhao, Shuhui Sun, Vittorio Morandi, Margherita Zavelani-Rossi, Federico Rosei, Alberto Vomiero

Biblio References: 
Volume: 30 Pages: 531-541
Nano Energy