Ropy foam-like TiO 2 film grown by water-based process for electron-conduction layer of perovskite solar cells
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Ropy foam-like TiO2 lm grown by water-based process for electron-conduction layer of perovskite solar cells Sarmad Fawzi Hamza Alhasan, Farnood Khalilzadeh-Rezaie, Robert E. Peale and Isaiah O Oladeji MRS Advances / FirstView Article / July 2016, pp 1 - 6 DOI: 10.1557/adv.2016.478, Published online: 20 June 2016
Link to this article: http://journals.cambridge.org/abstract_S2059852116004783 How to cite this article: Sarmad Fawzi Hamza Alhasan, Farnood Khalilzadeh-Rezaie, Robert E. Peale and Isaiah O Oladeji Ropy foam-like TiO2 lm grown by water-based process for electron-conduction layer of perovskite solar cells. MRS Advances, Available on CJO 2016 doi:10.1557/adv.2016.478 Request Permissions : Click here
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MRS Advances © 2016 Materials Research Society DOI: 10.1557/adv.2016.478
Ropy foam-like TiO2 film grown by water-based process for electronconduction layer of perovskite solar cells Sarmad Fawzi Hamza Alhasan1,2, Farnood Khalilzadeh-Rezaie3, Robert E. Peale3, Isaiah O Oladeji4 1
Department of Electrical and Computer Engineering, Orlando, Florida 32816-2362, U.S.A.
2
Laser and Optoelectronics Engineering Department, University of Technology, Baghdad, Iraq
3
Department of Physics, University of Central Florida, Orlando, Florida 32816-2385, U.S.A.
4
SISOM Thin Films LLC, Orlando, FL 32805, U.S.A.
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 k-cm, increasing with growth temperature, while sheet resistance is in the range 2 – 20 x 108 /Sq. Xray 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.
INTRODUCTION Performance of perovskite Solar Cells (PSC) has advanced rapidly [1-6]. Perovskites are compounds of the form ABO3. Solar cells based on spin-coated mesoporous TiO2 scaffold, CH3NH3PbI3 perovskite absorber layer, and a 2,2′,7,7′-tetrakis-(N,N-di-p-methoxyphenylamine)9,9′-bifluorene (spiro-OMeTAD) hole transport layer have been reported with power-conversion efficiency as high as 15%, and with 20% considered achievable. However mesoporous TiO2 as a conducting layer has demonstrated poor quality and poor electron conduction [7]. We present here a robust foam-like TiO2 film grown by a water-based process that can be a superior alternati
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