Alternate monolayers of CdSe nanocrystals and perylene tetracarboxylate: quantum dot hypersensitization for dye-sensitized solar cells.
Mono- and multilayers from CdSe nanocrystal dispersion and perylene tetracarboxylate solution are reported for the first time. The layers were investigated by UV-visible spectroscopy, cyclic voltammetry, photoconductivity, and photoelectrochemical techniques. The n-type organic semiconductor gives enhanced photoconductivity to the CdSe-NC multilayer structure. The photoactive perylene monolayer acts also as hypersensitizer of CdSe-NC structures. The perylene-modified CdSe-NC monolayer on indium tin oxide (ITO) electrode in a three-electrode photoelectrochemical cell upon illumination in the presence of oxygen generates an intense steady photocurrent as high as 10-20 times that expected from the individual contributions of perylene and CdSe-NCs. The hypersensitization mechanism is discussed on the basis of the energy level diagram of the components.
Istituto CNR per l' Energetica e le Interfasi , C.o Stati Uniti 4, 35127 Padova, Italy.
B
B
Vercelli
G
G
Zotti
A
A
Berlin
D019187:Cadmium Compounds / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D004566:Electrodes; D053768:Metal Nanoparticles / Q000737:chemistry*; D010569:Perylene / Q000737:chemistry*; D018036:Selenium Compounds / Q000737:chemistry*; D012993:Solar Energy; D017971:Tin Compounds / Q000737:chemistry
D019187:Cadmium Compounds; D004396:Coloring Agents; D018036:Selenium Compounds; D017971:Tin Compounds; D010569:Perylene; C109984:indium tin oxide; C058667:cadmium selenide