tailieunhanh - Báo cáo hóa học: " Efficient Performance of Electrostatic SprayDeposited TiO2 Blocking Layers in Dye-Sensitized Solar Cells after Swift Heavy Ion Beam Irradiation"

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: Efficient Performance of Electrostatic SprayDeposited TiO2 Blocking Layers in Dye-Sensitized Solar Cells after Swift Heavy Ion Beam Irradiation | Sudhagar et al. Nanoscale Res Lett 2011 6 30 http content 6 1 30 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Efficient Performance of Electrostatic Spray-Deposited TiO2 Blocking Layers in Dye-Sensitized Solar Cells after Swift Heavy Ion Beam Irradiation 12 1 31 1 P Sudhagar K Asokan June Hyuk Jung Yong-Gun Lee Suil Park Yong Soo Kang Abstract A compact TiO2 layer gm prepared by electrostatic spray deposition ESD and swift heavy ion beam SHI irradiation using oxygen ions onto a fluorinated tin oxide FTO conducting substrate showed enhancement of photovoltaic performance in dye-sensitized solar cells DSSCs . The short circuit current density Jsc mA cm-2 of DSSCs was found to increase significantly when an ESD technique was applied for fabrication of the TiO2 blocking layer compared to a conventional spin-coated layer Jsc mA cm-2 . When SHI irradiation of oxygen ions of fluence 1 X 1013 ions cm2 was carried out on the ESD TiO2 it was found that the energy conversion efficiency improved mainly due to the increase in open circuit voltage of DSSCs. This increased energy conversion efficiency seems to be associated with improved electronic energy transfer by increasing the densification of the blocking layer and improving the adhesion between the blocking layer and the FTO substrate. The adhesion results from instantaneous local melting of the TiO2 particles. An increase in the electron transport from the blocking layer may also retard the electron recombination process due to the oxidized species present in the electrolyte. These findings from novel treatments using ESD and SHI irradiation techniques may provide a new tool to improve the photovoltaic performance of DSSCs. Introduction Dye-sensitized solar cells DSSCs are a promising photovoltaic system for next generation solar cells that contain mesoporous nanocrystalline semiconductors like TiO2 ZnO and SnO2 as photoanodes anchored with dye .