期刊
JOURNAL OF POWER SOURCES
卷 325, 期 -, 页码 7-14出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.06.018
关键词
TiO2 sphere; TiO2 bead; Nanoporous; Photovoltaic; Dye-sensitized solar cell
资金
- Ministry of Science, ICT and Future Planning (MSIP) through the National Research Foundation of Korea (NRF) [2015M1A2A2052999]
- Korea Center for Artificial Photosynthesis (KCAP) - the MSIP through the NRF [20090093883]
Highly porous and monodispersed TiO2 spheres (SPs) with diameters in the range of 100-200 nm, notably smaller than the conventional SPs reported thus far, were selectively controlled, and found to be an outstanding building block for the mesoporous TiO2 layer in dye-sensitized solar cells (DSCs). The prepared TiO2 films employing these SPs are highly transparent, and the fabricated DSCs exhibit significantly enhanced photovoltaic performances. Particularly, the 100 nm-sized TiO2 SP (SP100) provides a photovoltaic conversion efficiency (PCE) of 10.66% with J(SC) of 17.98 mA/cm(2), V-OC of 808 mV, and FF of 0.734, which is higher than the PCE of DSCs with the typical 20 nm-sized TiO2 nanoparticle (NP20) or conventional 250 nm-sized SP (SP250). Transient photoelectron spectroscopic analyses revealed that both the electron diffusion coefficient and electron lifetime of the TiO2 layer increase as the size of the SPs decreases. The tiny TiO2 SPs prepared in this work offer distinct advantages in electron transport as well as dye-soaking and electrolyte diffusion. (C) 2016 Elsevier B.V. All rights reserved.
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