tailieunhanh - Báo cáo hóa học: " Silicon and Germanium Nanostructures for Photovoltaic Applications: Ab-Initio Results"

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: Silicon and Germanium Nanostructures for Photovoltaic Applications: Ab-Initio Results | Nanoscale Res Lett 2010 5 1637-1649 DOI s11671-010-9688-9 NANO EXPRESS Silicon and Germanium Nanostructures for Photovoltaic Applications Ab-Initio Results Stefano Ossicini Michele Amato Roberto Guerra Maurizia Palummo Olivia Pulci Received 16 June 2010 Accepted 1 July 2010 Published online 18 July 2010 The Author s 2010. This article is published with open access at Abstract Actually most of the electric energy is being produced by fossil fuels and great is the search for viable alternatives. The most appealing and promising technology is photovoltaics. It will become truly mainstream when its cost will be comparable to other energy sources. One way is to significantly enhance device efficiencies for example by increasing the number of band gaps in multijunction solar cells or by favoring charge separation in the devices. This can be done by using cells based on nanostructured semiconductors. In this paper we will present ab-initio results of the structural electronic and optical properties of 1 silicon and germanium nanoparticles embedded in wide band gap materials and 2 mixed silicon-germanium nanowires. We show that theory can help in understanding the microscopic processes important for devices performances. In particular S. Ossicini Dipartimento di Scienze e Metodi dell Ingegneria University di Modena e Reggio Emilia via Amendola 2 Pad. Morselli 42122 Reggio Emilia Italy e-mail ossicini@ S. Ossicini M. Amato R. Guerra Centro S3 CNR-Istituto di Nanoscienze Via Campi 213A I-41125 Modena Italy M. Amato R. Guerra Dipartimento di Fisica University di Modena e Reggio Emilia via Campi 213 A 41125 Modena Italy M. Palummo European Theoretical Spectroscopy Facility ETSF CNR-INFM-SMC Dipartimento di Fisica Universita di Roma Tor Vergata via della Ricerca Scientifica 1 00133 Roma Italy O. Pulci European Theoretical Spectroscopy Facility ETSF NAST Dipartimento di Fisica University di Roma Tor Vergata via della Ricerca Scientifica 1 00133