Journal
NANOSCALE RESEARCH LETTERS
Volume 12, Issue -, Pages -Publisher
SPRINGEROPEN
DOI: 10.1186/s11671-016-1811-0
Keywords
Enhancement of efficiency; N-doped TiO2 nanorod arrays; Electron transfer layer
Funding
- Science and Technology Development Project of Henan Province [142102210389]
- National Science Research Project of Education Department of Henan Province [17A140005]
- Program for Innovative Research Team (in Science and Technology) in University of Henan Province [13IRTSTHN017]
- NSFC-Henan Province Joint Fund [U1604144]
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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.
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