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다이아몬드 와이어에 의해 절단된 다결정 실리콘 태양전지의 나노텍스쳐링 및 후속 식각 연구
김명현(Myeong-Hyun Kim),송재원(Jae-Won Song),남윤호(Yoon-Ho Nam),김동형(Dong-Hyung Kim),유시영(Si-Young Yu),문환균(Hwan-Gyun Moon),유봉영(Bong-Young Yoo),이정호(Jung-Ho Lee) 한국표면공학회 2016 한국표면공학회지 Vol.49 No.3
The effects of nanotexturing and post-etching on the reflection and quantum efficiency properties of diamond wire sawn (DWS) multicrystalline silicon (mc-Si) solar cell have been investigated. The chemical solutions, which are acidic etching solution (HF-HNO₃), metal assisted chemical etching (MAC etch) solutions (AgNO₃-HF-DI, HF-H₂O₂-DI) and post-etching solution (diluted KOH at 80℃), were used for micro- and nano-texturing at the surface of diamond wire sawn (DWS) mc-Si wafer. Experiments were performed with various post-etching time conditions in order to determine the optimized etching condition for solar cell. The reflectance of mc-Si wafer texturing with acidic etching solution showed a very high reflectance value of about 30% (w/o anti-reflection coating), which indicates the insufficient light absorption for solar cell. The formation of nano-texture on the surface of mc-Si contributed to the enhancement of light absorption. Also, post-etching time condition of 240 s was found adequate to the nano-texturing of mc-Si due to its high external quantum efficiency of about 30% at short wavelengths and high short circuit current density (Jsc) of 35.4 A/cm².
다이아몬드 분말상에 무전해 Ni-B 도금을 위한 계면활성제의 영향
양창열(Changyol Yang),유시영(Si-Young Yu),문환균(Hwan-Gyun Moon),이정호(Jung-Ho Lee),유봉영(Bongyoung Yoo) 한국표면공학회 2017 한국표면공학회지 Vol.50 No.3
The properties of electroless Ni-B thin film on diamond powder with different parameters (temperature, pH, surfactant etc.) were studied. The surface morphology, structure and composition distribution of the Ni-B film were observed by field effect scanning electron microscope (FE-SEM), energy-dispersive spectrometer (EDS), X-ray diffraction (XRD) and Auger electron spectroscopy (AES). The growth rate of Ni-B film was increased with increase of bath temperature. The B content in Ni-B film was reduced with increase of bath pH. As a result the structure of Ni-B film was changed from amorphous to crystalline structure. The PVP in solution plays multi-functional roles as a dispersant and a stabilizer. The Ni-B film deposited with adding 0.1 mM-PVP was strongly introduced an amorphous structure with higher B content (25 at.%). Also the crystallite size of Ni-B film was reduced from 12.7 nm to 5.4 nm.