%0 Journal Article
%A Sobuś, Jan
%A Burdziński, Gotard
%A Karolczak, Jerzy
%A Idígoras, Jesús
%A Anta, Juan A.
%A Ziółek, Marcin
%D 2014
%T Comparison of TiO2 and ZnO Solar Cells
Sensitized with an Indoline Dye: Time-Resolved Laser Spectroscopy
Studies of Partial Charge Separation Processes
%U https://acs.figshare.com/articles/journal_contribution/Comparison_of_TiO_sub_2_sub_and_ZnO_Solar_Cells_Sensitized_with_an_Indoline_Dye_Time_Resolved_Laser_Spectroscopy_Studies_of_Partial_Charge_Separation_Processes/2316163
%R 10.1021/la404782s.s001
%2 https://ndownloader.figshare.com/files/3953806
%K Picosecond emission studies
%K laser spectroscopy methodology
%K ZnO Solar Cells Sensitized
%K DSC
%K indoline dye D 149
%K dye regeneration processes
%K 3 times
%K TiO 2 samples
%K nanosecond flash photolysis studies
%K TiO 2
%K Electrochemical impedance spectroscopy
%K charge separation processes
%X Time-resolved laser spectroscopy
techniques in the time range from
femtoseconds to seconds were applied to investigate the charge separation
processes in complete dye-sensitized solar cells (DSC) made with iodide/iodine
liquid electrolyte and indoline dye D149 interacting with TiO2 or ZnO nanoparticles. The aim of the studies was to explain
the differences in the photocurrents of the cells (3–4 times
higher for TiO2 than for ZnO ones). Electrochemical impedance
spectroscopy and nanosecond flash photolysis studies revealed that
the better performance of TiO2 samples is not due to the
charge collection and dye regeneration processes. Femtosecond transient
absorption results indicated that after first 100 ps the number of
photoinduced electrons in the semiconductor is 3 times higher for
TiO2 than for ZnO solar cells. Picosecond emission studies
showed that the lifetime of the D149 excited state is about 3 times
longer for ZnO than for TiO2 samples. Therefore, the results
indicate that lower performance of ZnO solar cells is likely due to
slower electron injection. The studies show how to correlate the laser
spectroscopy methodology with global parameters of the solar cells
and should help in better understanding of the behavior of alternative
materials for porous electrodes for DSC and related devices.
%I ACS Publications