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    Item type:Publication, Access status: without files ,
    Modified photoelectric properties of CH₃NH₃PbI₃ via surface passivation induced by argon ions bombardment
    (2019-09-01)
    Ren, Lixia
    ;
    Wang, Min
    ;
    Wang, Shuanhu
    ;
    Zeeshan, Hafiz
    ;
    Zhao, Yang
    Many investigations have revealed that PbI2 plays a passivated role to reduce the charge recombination in the perovskite films. However, due to the random distribution of PbI2 in perovskite films, the passivation effect is blanketed to some extent. In this work, we use the argon ions bombardment to deliberately induce the PbI2 layer at the surface of perovskite films and investigate the photoelectric performance of samples. It is found that the PbI2 layer at the surface can passivate the defects effectively, leading to an improvement of the photoconduction by an order of magnitude as well as the responsivity by >4 times under the irradiation of 405 nm light. The bombardment provides an effective method for perovskite surface passivation and optimizing the performances of perovskite-based photoelectric devices.
    Publicationtype: Journal Article
      13
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    The frustration-induced ferroelectricity of a manganite tricolor superlattice with artificially broken symmetry
    (2017-12-01)
    Pei, Huanyu
    ;
    Guo, Shujin
    ;
    Ren, Lixia
    ;
    Chen, Changle
    ;
    Luo, Bingcheng
    In this paper, [(La0.9Sr0.1MnO3)n/(Pa0.9Ca0.1MnO3)n/(La0.9Sb0.1MnO3)n]m superlattices films have been deposited on (001) Nb:SrTiO3 substrates by a laser molecular-beam epitaxy technology. Expected ferroelectricity arise at well-defined tricolor superlattice at low temperature, composed of transition metal manganite, which is absent in the single-phase compounds. Furthermore, the ferroelectric properties of the superlattices are enhanced by increasing the periodicity m, which may be attributed to the accumulation of the polarization induced by the frustration. As for the magnetic hysteresis loop characteristics of the multilayer structures, the saturation magnetization and magnetic coercivity of films present definitely a strong periodic dependence. It also indicates that the frustration may exist in the tricolor superlattice. Our results further verify the previous theoretical research of generating multiferroics experimentally paving a way for designing or developing the novel magnetoelectric devices based on manganite ferromagnets.
    Publicationtype: Journal Article
      2