Speedy photoelectric exchange of CdSe quantum dots/mesoporous titania composite system

Two classes of important nano-materials, mesoporous titania ( MT) and CdSe quantum dots, are prepared via chemical methods. Rapid immobilization of CdSe quantum dots into mesoporous titania has been achieved and the composite system is characterized by high-resolution transmission electron microscopy and photoluminescence. The band-to-band photoluminescence emission of CdSe quantum dots is blue-shifted for 20 nm after the dots are immobilized into mesoporous titania. Loading CdSe quantum dots into mesoporous titania leads to speedy photoelectric exchange process of the system and a significant rise in photoconductivity ( for a factor of 8), which would attract great deal of attention in quantum dots solar cell. (C) 2008 Elsevier B.V. All rights reserved.