tailieunhanh - Báo cáo hóa học: " Nanostructured hybrid ZnO thin films for energy conversion"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Nanostructured hybrid ZnO thin films for energy conversion | Moya et al. Nanoscale Research Letters 2011 6 384 http content 6 1 384 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Nanostructured hybrid ZnO thin films for energy conversion Mónica Moya1 Anura Priyajith Samantilleke2 Miquel Mollar1 and Bernabé Marí1 Abstract We report on hybrid films based on ZnO organic dye prepared by electrodeposition using tetrasulfonated copper phthalocyanines TS-CuPc and Eosin-Y EoY . Both the morphology and porosity of hybrid ZnO films are highly dependent on the type of dyes used in the synthesis. High photosensitivity was observed for ZnO EoY films while a very weak photoresponse was obtained for ZnO TS-CuPc films. Despite a higher absorption coefficient of TS-CuPc than EoY in ZnO EoY hybrid films the excited photoelectrons between the EoY levels can be extracted through ZnO and the porosity of ZnO EoY can also be controlled. Introduction Replacing the conventional TiO2 nanocrystalline nc electrode with organic inorganic hybrid nanostructures will undoubtedly improve overall performance of dye-sensitized solar cells DSSC . Inorganic nc-ZnO is a promising candidate for such hybrid structures due to its unique properties such as high conductivity wide bandgap eV and high excitonic binding energy 60 mV 1 . In addition the conduction band edge position of ZnO eV is similar to that of TiO2 eV . Furthermore ZnO can easily be electrochemically deposited ECD at low temperature and hybrid nanostructures with ZnO can also be co-deposited with dyes such as Eosin-Y EoY . It has been reported that the dye molecules are strongly attached to the ZnO matrix filling the voids by means of sulfonic or carboxyl groups 2 . In this article we report on a study of different hybrids of ZnO nanostructures obtained by changing the dye in the deposition electrolyte. While different aspects of pure ZnO have been reported extensively by the other authors 3 4 this article focuses on the growth of .