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Ropy foam-like TiO2 film grown by water-based process for electron-conduction layer of perovskite solar cells

Published online by Cambridge University Press:  20 June 2016

Sarmad Fawzi Hamza Alhasan ,
Farnood Khalilzadeh-Rezaie ,
Robert E. Peale  and
Isaiah O Oladeji
Sarmad Fawzi Hamza Alhasan*
Affiliation:
Department of Electrical and Computer Engineering, Orlando, Florida 32816-2362, U.S.A. Laser and Optoelectronics Engineering Department, University of Technology, Baghdad, Iraq
Farnood Khalilzadeh-Rezaie
Affiliation:
Department of Physics, University of Central Florida, Orlando, Florida 32816-2385, U.S.A.
Robert E. Peale
Affiliation:
Department of Physics, University of Central Florida, Orlando, Florida 32816-2385, U.S.A.
Isaiah O Oladeji
Affiliation:
SISOM Thin Films LLC, Orlando, FL 32805, U.S.A.
*
*(Email: [email protected])
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Abstract

Self-assembled TiO2 foam-like films, were grown by the water based Streaming Process for Electrodeless Electrochemical Deposition (SPEED). The morphology of the ∼1 µm thick films consists of a tangled ropy structure with individual strands of ∼200 nm diameter and open pores of 0.1 to 3 micron dimensions. Such films are advantageous for proposed perovskite solar cell comprising CH3NH3PbI3 absorber with additional inorganic films as contact and conduction layers, all deposited by SPEED. Lateral film resistivity is in the range 20 – 200 kΩ-cm, increasing with growth temperature, while sheet resistance is in the range 2 – 20 x 108 Ω/Sq. X-ray diffraction confirms presence of TiO2 crystals of orthorhombic class (Brookite). UV-vis spectroscopy shows high transmission below the expected 3.2 eV TiO2 bandgap. Transmittance increases with growth temperature.

Keywords

annealingelectrical propertiesfilm
Type
Articles
Information
MRS Advances , Volume 1 , Issue 46: Energy and Environment , 2016 , pp. 3169 - 3174
Copyright
Copyright © Materials Research Society 2016 

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