TAILIEUCHUNG - báo cáo hóa học:" Structural and optical properties of a radio frequency magnetron-sputtered ZnO thin film with different growth angles"

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: Structural and optical properties of a radio frequency magnetron-sputtered ZnO thin film with different growth angles | Ko et al. Nanoscale Research Letters 2012 7 55 http content 7 1 55 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Structural and optical properties of a radio frequency magnetron-sputtered ZnO thin film with different growth angles 1 1 1 2 3 4 Ki-Han Ko Yeun-Ho Joung Won Seok Choi Mungi Park Jaehyung Lee and Hyun-Suk Hwang Abstract This study introduces optical properties of a columnar structured zinc oxide ZnO antireflection coating for solar cells. We obtained ZnO films of columnar structure on glass substrates using a specially designed radio frequency magnetron sputtering system with different growth angles. Field-emission scanning electron microscopy was utilized to check the growth angles of the ZnO films which were controlled at 0 15 and 30 . The film thickness was fixed at 100 nm to get a constant experiment condition. Grain sizes of the ZnO films were measured by X-ray diffraction. A UV-visible spectrometer was used to measure the transmittance and reflectance of the ZnO film columnar structures as a function of the growth angles. Keywords ZnO film growth angle antireflection coating RF magnetron sputtering solar cell Introduction To achieve a high efficient solar cell one of the most important processes is antireflection coating ARC which also has a function of passivation 1 . ARCs generally reduce the reflection of sunlight and increase the intensity of radiation on the inside of solar cells. With the antireflection layer Choi et al. 2 demonstrated that solar cell efficiency can be increased by around 10 . In general the refractive index of a thin film is variable according to the kind of material and thickness of the films. It is addressed that a medium refractive index material between air n 1 and Si n is optimal for the ARC 1 . However with glass-based solar cells such as dye-sensitized and thin film solar cells it is hard to get a good antireflection effect due to a low refractive index of .

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