The paper deals with the complex refractive index and photoluminescence in the IR-VIS light region of two sample types （i） black p-type silicon （BSi） produced by the surface structure chemical transfer method usin...The paper deals with the complex refractive index and photoluminescence in the IR-VIS light region of two sample types （i） black p-type silicon （BSi） produced by the surface structure chemical transfer method using Pt catalytic mesh, and （ii） porous p-type silicon prepared by standard electrochemical etching. We present, compare, and discuss the values of the IR-VIS complex refractive index obtained by calculation using the Kramers-Kronig transformation and the photoluminescence properties thereof. The results indicate that differences between the optical properties of the BSi and the porous Si are given by （a） the oxidation procedure of BSi, （b） the thickness of the formed black and porous Si layer, and by （c） the porosity of both layer types. We assume that the photoluminescence signal generated by oxidized BSi structures can be mainly related to the quantum confinement effect, while the photoluminescence of the porous p-type Si is caused by the optical activity of the SiOxHy compounds covering its surface region.展开更多
After the shock of the Great East Japan Earthquake on 11 March 2011, the issue of local sustainability is presently center stage in the Japanese political process, and educational and research values are imperative fo...After the shock of the Great East Japan Earthquake on 11 March 2011, the issue of local sustainability is presently center stage in the Japanese political process, and educational and research values are imperative for long-term cost savings, risk management, and clean, efficient energy generation. This study illustrates the Sustainable Campus Initiative approach at Keio University that students have been undertaking to make the campus more sustainable and resilient during post-disaster restoration. To unveil innovative recovery concepts, processes, and social challenges, several outcomes that maximize energy efficiency and conservation opportunities are discussed. The results indicate that the Sustainable Campus Initiative contributed to energy relief in the summer of 2011. It made campus life more creative during a period when the 15 percent mandatory power-saving order by the government to big clients of Tokyo and Tohoku Electric was established. Pilot experiments provide a useful example of how the communications media have an extraordinary ability to increase public understanding of social issues. Since the March 11 disaster, power shortages have redirected renewed attention to fossil fuels. As large energy consumers, universities have an increased responsibility to demonstrate their commitment to sustainable design and encourage innovative development concepts in their regions in the future.展开更多
文摘The paper deals with the complex refractive index and photoluminescence in the IR-VIS light region of two sample types （i） black p-type silicon （BSi） produced by the surface structure chemical transfer method using Pt catalytic mesh, and （ii） porous p-type silicon prepared by standard electrochemical etching. We present, compare, and discuss the values of the IR-VIS complex refractive index obtained by calculation using the Kramers-Kronig transformation and the photoluminescence properties thereof. The results indicate that differences between the optical properties of the BSi and the porous Si are given by （a） the oxidation procedure of BSi, （b） the thickness of the formed black and porous Si layer, and by （c） the porosity of both layer types. We assume that the photoluminescence signal generated by oxidized BSi structures can be mainly related to the quantum confinement effect, while the photoluminescence of the porous p-type Si is caused by the optical activity of the SiOxHy compounds covering its surface region.
文摘After the shock of the Great East Japan Earthquake on 11 March 2011, the issue of local sustainability is presently center stage in the Japanese political process, and educational and research values are imperative for long-term cost savings, risk management, and clean, efficient energy generation. This study illustrates the Sustainable Campus Initiative approach at Keio University that students have been undertaking to make the campus more sustainable and resilient during post-disaster restoration. To unveil innovative recovery concepts, processes, and social challenges, several outcomes that maximize energy efficiency and conservation opportunities are discussed. The results indicate that the Sustainable Campus Initiative contributed to energy relief in the summer of 2011. It made campus life more creative during a period when the 15 percent mandatory power-saving order by the government to big clients of Tokyo and Tohoku Electric was established. Pilot experiments provide a useful example of how the communications media have an extraordinary ability to increase public understanding of social issues. Since the March 11 disaster, power shortages have redirected renewed attention to fossil fuels. As large energy consumers, universities have an increased responsibility to demonstrate their commitment to sustainable design and encourage innovative development concepts in their regions in the future.
