Influence of the concentration of TiCl^sub 4^ solution used for post-treatment on mesoporous TiO^sub 2^ layers in hybrid lead halide perovskite solar cells

The influence of the concentration of a TiCl4 aqueous solution used for post-treatment on the device performance of MAPbI3-xClx perovskite solar cells is investigated. All cell parameters increase after treatment by TiCl4 up to the concentration of 100 mM. The enhancement in the fill factor is mainl...

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Bibliographic Details
Published in:Solar energy 2017-10, Vol.155, p.1148
Main Authors: Choe, Geunpyo, Kang, Jinhyun, Ryu, Ilhwan, Song, Si Won, Kim, Hyung Min, Yim, Sanggyu
Format: Article
Language:English
Subjects:
Electrochemical impedance spectroscopy
Electrochemistry
Heat transfer
Luminescence
Photoluminescence
Photons
Photovoltaic cells
Photovoltaics
Quenching
Recombination
Short circuits
Solar cells
Solar energy
Spectroscopy
Studies
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Summary:The influence of the concentration of a TiCl4 aqueous solution used for post-treatment on the device performance of MAPbI3-xClx perovskite solar cells is investigated. All cell parameters increase after treatment by TiCl4 up to the concentration of 100 mM. The enhancement in the fill factor is mainly attributed to the decrease in the series resistance of the treated cells, which is verified via photovoltaic and electrochemical impedance spectroscopy (EIS) measurements. Moreover, more efficient transport and suppressed recombination of charges in the treated cells are observed via EIS and photoluminescence quenching experiments, leading to an increase in the short circuit current density of the treated cells. As a result, a maximum efficiency of 15.6% is achieved for the cell post-treated with 100 mM TiCl4 solution, which is 1.25 times greater than that of the untreated cell, 12.4%.
ISSN:0038-092X
1471-1257