Strongly enhanced light trapping in a two-dimensional silicon nanowire random fractal array

查看全文 作　　者：Barbara [1]Fazio;Pietro [2]Artoni;Maria Antonia [1]Iatì;Cristiano D’[3]Andrea;Maria JosèLo [1,2,3]Faro;Salvatore Del [4]Sorbo;Stefano [4]Pirotta;Pietro Giuseppe [1]Gucciardi;Paolo [2,3]Musumeci;Cirino Salvatore [1]Vasi;Rosalba [5]Saija;Matteo [4]Galli;Francesco [2,3,6]Priolo;Alessia [1]Irrera

机构地区：[1]CNR-IPCF,Istituto per i Processi Chimico Fisici,98158 Messina,Italy;[2]Dipartimento di Fisica e Astronomia,Universitàdi Catania,95123 Catania,Italy;[3]CNR-MATIS IMM,Istituto per la Microelettronica e Microsistemi,95123 Catania,Italy;[4]Dipartimento di Fisica,Universitàdegli Studi di Pavia,27100 Pavia,Italy;[5]Dipartimento di Scienze Matematiche e Informatiche,Scienze Fisiche e Scienze della Terra,Universitàdi Messina,98166 Messina,Italy;[6]Scuola Superiore di Catania,Universitàdi Catania,via Valdisavoia,9,95123 Catania,Italy

出　　处：《Light(Science & Applications)》索引2016年第5卷第1期,共7页

摘　　要：We report on the unconventional optical properties exhibited by a two-dimensional array of thin Si nanowires arranged in a random fractal geometry and fabricated using an inexpensive,fast and maskless process compatible with Si technology.The structure allows for a high light-trapping efficiency across the entire visible range,attaining total reflectance values as low as 0.1%when the wavelength in the medium matches the length scale of maximum heterogeneity in the system.We show that the random fractal structure of our nanowire array is responsible for a strong in-plane multiple scattering,which is related to the material refractive index fluctuations and leads to a greatly enhanced Raman scattering and a bright photoluminescence.These strong emissions are correlated on all length scales according to the refractive index fluctuations.The relevance and the perspectives of the reported results are discussed as promising for Si-based photovoltaic and photonic applications. 关键词：light trapping multiple scattering Raman enhancement random fractal silicon nanowires

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Strongly enhanced light trapping in a two-dimensional silicon nanowire random fractal array

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