KOSEN 한인과학기술자네트워크

>안녕하십니까? > >저는 저반사 multi-layer coating 실험을 하고 있는 > >대학원생입니다.. > >그런데.. 논문을 보니까 simulation한 두께와 실제 측정한 두께가 > >있던데.. 어떤 simulation program이 있는지 궁금하네요... > >그럼 아시는 분이 계시면 알려주시면 고맙겠습니다.. ======================================================== You can find a similar approach in this paper: Solar Energy Materials and Solar Cells Volume 71, Issue 1 31 January 2002 Pages 73-83 Optical properties of higher and lower refractive index composites in solar selective coatings M. Farooq, , a and M. G. Hutchinsb a National Institute of Silicon Technology, No. 25, H-9, Islamabad, Pakistan b Solar Energy Materials Research Laboratory, School of Engineering, Oxford Brookes University, Oxford OX3 0BP, UK Received 25 May 2000; revised 10 February 2001. Available online 15 November 2001. Abstract The focus of attention in this study was the choice of material for optically solar selective coatings on the basis of their optical constants. A computer programme which calculates the optical constants, solar absorptance at air mass (AM)-2, , and thermal emittance at 300 K, , of the 200-nm-thick selective coating on the assumption of both the Maxwell Garnett and Bruggeman theories for the metallic volume fraction below and above 0.3 respectively, was used to design the structure of the composite films. Two systems of composite thin films of metal and dielectric were investigated experimentally, fabricated by RF and DC sputter coater and were verified with computer simulations. One system consist of lower refractive index composites such as Ni : SiO2 and the other of higher refractive index composites such as V : Al2O3 in the spectral range of 0.3¯20 m. These films were fabricated on infrared reflective substrates such as nickel plated copper or aluminium. Results of the copper substrates are being presented here. For comparison and verification, tungsten, cobalt and chromium based composites, having different refractive indices, were also investigated which validated the concept of the choice of material in selective coatings. It was observed that high refractive index composites have lower reflective properties by choosing suitable metallic volume fraction in dielectric and antireflection coating. The higher value of the imaginary part of refractive index, k, is responsible for higher absorption by a factor =4k/. Solar absorptance of 0.98 and 0.96 was achieved by simulation and experimental findings with less than 0.05 thermal emittance for 200 nm thick composites of V : Al2O3. It results that higher values of both n and k of the material are more suitable in solar selective coatings. ==================== Let me give you more references... 1. Optical properties of higher and lower refractive index composites in solar selective coatings, Solar Energy Materials and Solar Cells, Volume 71, Issue 1, 31 January 2002, Pages 73-83 M. Farooq and M. G. Hutchins SummaryPlus | Article | Journal Format-PDF (317 K) 2. Substrate to substrate aluminized bonding of 10 cm round silicon substrates for application in solar photovoltaics, Solar Energy Materials and Solar Cells, Volume 59, Issue 3, October 1999, Pages 211-216 P. N. Vinod, B. C. Chakravarty, Prem Prakash, Ravi Kumar, P. K. Singh, S. N. Singh and B. K. Das SummaryPlus | Article | Journal Format-PDF (113 K) 3. Design and simulation of antireflection coating systems for optoelectronic devices: Application to silicon solar cells, Solar Energy Materials and Solar Cells, Volume 52, Issues 1-2, 16 March 1998, Pages 79-93 D. Bouhafs, A. Moussi, A. Chikouche and J. M. Ruiz Abstract | Journal Format-PDF (347 K) 4. Multiple minima in the ellipsometric error function, Thin Solid Films, Volumes 313-314, 13 February 1998, Pages 124-127 Samuel A. Alterovitz and Blaine Johs SummaryPlus | Article | Journal Format-PDF (156 K) 5. A novel method of optical proximity correction using anti-reflective layers and individual photoresist characteristics., Microelectronic Engineering, Volume 35, Issues 1-4, February 1997, Pages 185-188 G. Arthur and B. Martin Abstract | Journal Format-PDF (231 K)

굴절률과 박막 두께를 가지고 시뮬레이션하면 반사도 (R)을 구할 수가 있죠. 한국에는 이런 프로그램이 들어가 있는지 모르겠군요. 데모버젼을 가지고 있는데, 필요하시면 연락주시길. 김 덕양 드림.