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Báo cáo hóa học: " Investigation into Photoconductivity in Single CNF/TiO2-Dye Core–Shell Nanowire Devices"

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: Investigation into Photoconductivity in Single CNF/TiO2-Dye Core–Shell Nanowire Devices | Nanoscale Res Lett 2010 5 1480-1486 DOI 10.1007 s11671-010-9665-3 NANO EXPRESS Investigation into Photoconductivity in Single CNF TiO2-Dye Core-Shell Nanowire Devices Zhuangzhi Li Caitlin Rochford F. Javier Baca Jianwei Liu Jun Li Judy Wu Received 26 April 2010 Accepted 3 June 2010 Published online 15 June 2010 The Author s 2010. This article is published with open access at Springerlink.com Abstract A vertically aligned carbon nanofiber array coated with anatase TiO2 CNF TiO2 is an attractive possible replacement for the sintered TiO2 nanoparticle network in the original dye-sensitized solar cell DSSC design due to the potential for improved charge transport and reduced charge recombination. Although the reported efficiency of 1.1 in these modified DSSC s is encouraging the limiting factors must be identified before a higher efficiency can be obtained. This work employs a single nanowire approach to investigate the charge transport in individual CNF TiO2 core-shell nanowires with adsorbed N719 dye molecules in dark and under illumination. The results shed light on the role of charge traps and dye adsorption on the photo conductivity of nanocrystalline TiO2 CNF s as related to dye-sensitized solar cell performance. Keywords Photoconductivity Nanowire Titanium dioxide Dye-sensitized solar cell Core-shell Z. Li Department of Physics Hebei Normal University and Hebei Advanced Thin Film Laboratory 050016 Shijiazhuang People s Republic of China C. Rochford J. Wu Department of Physics and Astronomy University of Kansas Lawrence KS 66045 USA e-mail caitlinr@ku.edu F. Javier Baca Los Alamos National Laboratory Los Alamos NM 87545 USA J. Liu J. Li Department of Chemistry Kansas State University Manhattan KS 66506 USA Introduction Recently many efforts in solar cell development have employed nontraditional schemes that are different from the conventional planar semiconductor p-n junction design in order to focus on simplifying fabrication and decreasing cost while .