By a News Reporter-Staff News Editor at Journal of Technology -- Research findings on Materials Science are discussed in a new report. According to news originating from Tainan, Taiwan, by VerticalNews correspondents, research stated, "In this study, we examine the electron transport dynamics in TiO2 films of back-illuminated dye-sensitized solar cells. The TiO2 films are fabricated using electrophoretic deposition (EPD) and the conventional paste-coating (PC) of TiO2 nanoparticles on Ti-foil substrates."
Our news journalists obtained a quote from the research from National Cheng Kung University, "Intensity-modulated photocurrent spectroscopy reveals that red-light irradiation is more efficient than blue-light irradiation for generating photocurrents for back-illuminated cells. A single trapping-detrapping diffusion mode, without trap-free diffusion, reveals the electron transport dynamics involved in the backside illumination. The closely-packed EPD films exhibit a shorter electron transit time than does the loosely packed PC films. The porosity dependence of the electron diffusion rate is consistent with the 3D percolation model for metallic solid spheres. The EPD films possess longer electron lifetimes because of their smaller void fraction, which suppresses recombination with electrolytes. The EPD cells, which feature rapid electron transport and suppressed recombination in the TiO2 films, exhibit a maximum power conversion efficiency of 7.1%, which is higher than that of PC cells (6.0%). Because the distance between electron injection and collection is close to the film thickness and the transport lacks trap-free diffusion, the performance of back-illuminated cells is more sensitive to TiO2 film thickness and porosity than the performance of the front-illuminated cells."
According to the news editors, the research concluded: "This study demonstrates the advantages of EPD-film architecture in promoting charge collection for high power conversion."
For more information on this research see: Electron Transport Dynamics in TiO2 Films Deposited on Ti Foils for Back-Illuminated Dye-Sensitized Solar Cells. ACS Applied Materials & Interfaces, 2013;5(22):11958-11964. ACS Applied Materials & Interfaces can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; ACS Applied Materials & Interfaces - www.pubs.acs.org/journal/aamick)
The news correspondents report that additional information may be obtained from L.C. Chen, National Cheng Kung University, Center Micro Nano Sci & Technol, Tainan 70101, Taiwan. Additional authors for this research include C.T. Hsieh, Y.L. Lee and H.S. Teng.
Keywords for this news article include: Asia, Tainan, Taiwan, Materials Science
Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC