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Secondary Hydrothermally Processed Engineered Titanium Dioxide Nanostructures for Efficient Perovskite Solar Cells
Author(s) -
Mali Sawanta S.,
Shim Chang Su,
Kim Hyungjin,
Betty Chirayath A.,
Patil Pramod S.,
Hong Chang Kook
Publication year - 2017
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201700030
Subject(s) - dielectric spectroscopy , materials science , photocurrent , chemical engineering , perovskite (structure) , titanium dioxide , rutile , energy conversion efficiency , nanostructure , photocatalysis , photoluminescence , nanotechnology , electrochemistry , electrode , optoelectronics , chemistry , composite material , catalysis , organic chemistry , engineering
A secondary hydrothermal process was used to synthesize exotic hollow nanostructures of rutile TiO 2 as an electron‐transport layer for perovskite solar cells. The prepared nanostructures were used in combination with methylammonium lead iodide (MAPbI 3 ) perovskite, and their photovoltaic properties were studied. This core–shell architecture of a perovskite enveloped by TiO 2 provides an enhanced surface area, better contact with the perovskite because of the larger adsorption area, and effective light penetration. Our results revealed that the hollow nanoflowers exhibit a photocurrent density of 21.05 mA cm −2 , an open‐circuit voltage of 0.916 V, and a fill factor of 0.66, which leads to a power conversion efficiency of 12.72 %. These results were also verified by electrochemical impedance spectroscopy and time‐resolved photoluminescence spectroscopy. Furthermore, the effect of the wetting time was studied, and our results revealed that a minimum time of 100 s is required for good penetration of a MAPbI 3 /γ‐butyrolactone solution.