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: Facile solution growth of vertically aligned ZnO nanorods sensitized with aqueous CdS and CdSe quantum dots for photovoltaic applications | Luan et al. Nanoscale Research Letters 2011 6 340 http content 6 1 340 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Facile solution growth of vertically aligned ZnO nanorods sensitized with aqueous CdS and CdSe quantum dots for photovoltaic applications z Z-I Chunyan Luan Aleksandar Vaneski Andrei S Susha Xueqing Xu Hong-En Wang Xue Chen Jun Xu Wenjun Zhang1 2 Chun-Sing Lee1 2 Andrey L Rogach1 3 and Juan Antonio Zapien1 2 Abstract Vertically aligned single crystalline ZnO nanorod arrays approximately 3 pm in length and 50-450 nm in diameter are grown by a simple solution approach on a Zn foil substrate. CdS and CdSe colloidal quantum dots are assembled onto ZnO nanorods array using water-soluble nanocrystals capped as-synthesized with a short-chain bifuncional linker thioglycolic acid. The solar cells co-sensitized with both CdS and CdSe quantum dots demonstrate superior efficiency compared with the cells using only one type of quantum dots. A thin Al2O3 layer deposited prior to quantum dot anchoring successfully acts as a barrier inhibiting electron recombination at the Zn ZnO electrolyte interface resulting in power conversion efficiency of approximately 1 with an improved fill factor of . The in situ growth of ZnO nanorod arrays in a solution containing CdSe quantum dots provides better contact between two materials resulting in enhanced open circuit voltage. Introduction As an n-type semiconductor with a direct and wide bandgap of eV ZnO is an attractive material for a variety of applications ranging from ultraviolet lasers 1 and sensors 2 to field-emission devices 3 . In recent years vertically aligned one-dimensional ZnO nanostructures have gained great interest for dye-synthesized solar cells 4 5 as a promising alternative to mesoporous TiO2 films 6 . Both ZnO and TiO2 have similar bandgaps while the higher electron mobility and direct electrical pathways provided by
