سال انتشار: ۱۳۸۸
محل انتشار: سومین کنفرانس نانوساختارها
تعداد صفحات: ۴
R Mohammadpour – Institute for Nanoscience and Nanotechnology, Sharif University of Technology, Tehran
G Boschloo – Department of Physical Chemistry, Uppsala University
A Hagfeldt – Department of Physical Chemistry, Uppsala University
A Iraji zad – Institute for Nanoscience and Nanotechnology, Sharif University of Technology
In this paper we have studied the performance of dye-sensitized solar cells (DSCs) based on nanotube arrays of TiO2 with different lengths and compared them to nanoparticular films. By measuring electron transport time and lifetime using transient photocurrent and photovoltage techniques we found out the electron transport is quit comparable in these two morphologieshowever the electron lifetime is much longer in nanotubular structure so we have much larger electron diffusion length and charge collection efficiencies in nanotubular electrodes. By measuring extracted charges at open circuit condition we found thatnanotubular structure have higher density of traps in deeper levels that make it difficult for electrons to transport through these one-dimensional ordered nanostructures, so in spite of high degree of order we have quit comparable transport time similar to nanoparticulate electrodes.