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Nanoscale Res Lett. 2017 Dec;12(1):43. doi: 10.1186/s11671-016-1811-0. Epub 2017 Jan 17.

Enhancement of Perovskite Solar Cells Efficiency using N-Doped TiO2 Nanorod Arrays as Electron Transfer Layer.

Author information

1
School of Physics and Electronics, Henan University, Kaifeng, 475004, China.
2
School of Physics and Electronics, Henan University, Kaifeng, 475004, China. ylmao1@163.com.
3
Institute for Computational Materials Science, Henan University, Kaifeng, 475004, China. ylmao1@163.com.

Abstract

In this paper, N-doped TiO2 (N-TiO2) nanorod arrays were synthesized with hydrothermal method, and perovskite solar cells were fabricated using them as electron transfer layer. The solar cell performance was optimized by changing the N doping contents. The power conversion efficiency of solar cells based on N-TiO2 with the N doping content of 1% (N/Ti, atomic ratio) has been achieved 11.1%, which was 14.7% higher than that of solar cells based on un-doped TiO2. To get an insight into the improvement, some investigations were performed. The structure was examined with X-ray powder diffraction (XRD), and morphology was examined by scanning electron microscopy (SEM). Energy dispersive spectrometer (EDS) and Tauc plot spectra indicated the incorporation of N in TiO2 nanorods. Absorption spectra showed higher absorption of visible light for N-TiO2 than un-doped TiO2. The N doping reduced the energy band gap from 3.03 to 2.74 eV. The photoluminescence (PL) and time-resolved photoluminescence (TRPL) spectra displayed the faster electron transfer from perovskite layer to N-TiO2 than to un-doped TiO2. Electrochemical impedance spectroscopy (EIS) showed the smaller resistance of device based on N-TiO2 than that on un-doped TiO2.

KEYWORDS:

Electron transfer layer; Enhancement of efficiency; N-doped TiO2 nanorod arrays

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