title: Enhancement of Perovskite Solar Cells Efficiency using N-Doped TiO2Nanorod Arrays as Electron Transfer Layer.
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-TiO2with 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 TiO2nanorods. Absorption spectra showed higher absorption of visible light for N-TiO2than 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-TiO2than to un-doped TiO2. Electrochemical impedance spectroscopy (EIS) showed the smaller resistance of device based on N-TiO2than that on un-doped TiO2.
authors.affiliation: School of Physics and Electronics, Henan University, Kaifeng, 475004, China.
authors.forename: Zhen-Long
authors.initials: ZL
authors.lastname: Zhang
authors.affiliation: School of Physics and Electronics, Henan University, Kaifeng, 475004, China.
authors.forename: Jun-Feng
authors.initials: JF
authors.lastname: Li
authors.affiliation: School of Physics and Electronics, Henan University, Kaifeng, 475004, China.
authors.forename: Xiao-Li
authors.initials: XL
authors.lastname: Wang
authors.affiliation: School of Physics and Electronics, Henan University, Kaifeng, 475004, China.
authors.forename: Jian-Qiang
authors.initials: JQ
authors.lastname: Qin
authors.affiliation: School of Physics and Electronics, Henan University, Kaifeng, 475004, China.
authors.forename: Wen-Jia
authors.initials: WJ
authors.lastname: Shi
authors.affiliation: School of Physics and Electronics, Henan University, Kaifeng, 475004, China.
authors.forename: Yue-Feng
authors.initials: YF
authors.lastname: Liu
authors.affiliation: School of Physics and Electronics, Henan University, Kaifeng, 475004, China.
authors.forename: Hui-Ping
authors.initials: HP
authors.lastname: Gao
authors.affiliation: School of Physics and Electronics, Henan University, Kaifeng, 475004, China. ylmao1@163.com.|Institute for Computational Materials Science, Henan University, Kaifeng, 475004, China. ylmao1@163.com.
authors.forename: Yan-Li
authors.initials: YL
authors.lastname: Mao
keywords: Electron transfer layer; Enhancement of efficiency; N-doped TiO2 nanorod arrays