Fabrication and Characterization of High Stability (EDA)(FA)2[Pb3I10] Layered Perovskite Film

doi:10.15541/jim20160156

Abstract

Abstract:

A new two-dimensional layered hybrid perovskite solar-cell absorber was synthesized by one-step method, using (EDA)I₂, (FA)I, and PbI₂with a 1:2:3 stoichiometric ratio in a solvent mixture of N, N-dimethylformamide(DMF). Ethylenediamine(EDA) cation was introduced into the perovskite lattice to synthesize a layered structure with improved resistance to the degradation by humidity in air. The effects of humidity and time on crystal structure, composition, morphology, and absorption spectra of (EDA)(FA)₂[Pb₃I₁₀] and CH₃NH₃PbI₃were analyzed by in situ grazing incidence X-ray diffraction(GIXRD), X-ray diffraction (XRD), scanning electron microscope (SEM), atomic force microscope(AFM), and UV-Vis spectroscope. The results reveal that the prepared (EDA)(FA)₂[Pb₃I₁₀] film is more moisture resistant than the CH₃NH₃PbI₃ film which is widely used in the perovskite solar cell. SEM analysis reveals that the (EDA)(FA)₂[Pb₃I₁₀] film has a layered structure, which can reduce the degradation caused by moisture. What’s more, UV-Vis light absorption spectroscopy and atomic force microscopy(AFM) results show that the layered structure film is also a suitable absorber for perovskite solar cells. Photoluminescence spectrum(PL) reveals that bandgap of the (EDA)(FA)₂[Pb₃I₁₀] film is 1.67 eV, which is close to the optimum value for solar photoelectric conversion. As compared to CH₃NH₃PbI₃ film, the low-cost perovskite structure offers greater tunability on a molecular level for further material optimization and possibility for widely used in the future.

Key words: one-step method, perovskite, GIXRD, (EDA)(FA)₂[Pb₃I₁₀]

CLC Number:

TM914

GAO Yan-Min, JIANG Wen-Long, YANG Tie-Ying, ZUO Yin-Ze. Fabrication and Characterization of High Stability (EDA)(FA)₂[Pb₃I₁₀] Layered Perovskite Film[J]. Journal of Inorganic Materials, 2016, 31(10): 1129-1134.

Figures/Tables 7

Fig. 1 SEM images of (a) (EDA)(FA)2[Pb3I10] and (b) CH3NH3PbI3 films

Fig. 2 (a) Schematic of the humidity control apparatus and (b) and the GIXRD experimental setup for perovskite films on glass

Fig. 3 2D GIXRD patterns of EDA(FA)2[Pb3I10] film on glass after (a) 0 min, (b) 120 min; and CH3NH3PbI3 film on glass after (c) 0 min, (d) 15 min exposure to (80±1)% RH

Fig. 4 Schematic representation of single-layer <100>-oriented perovskites (a) monoammonium (PEA=C6H5(CH2)2NH3+) or (b) diammonium (EDA=+ H3N(CH2)2NH3+) organic cations

Fig. 5 Photograph of contact angles of a water drop on (a) CH3NH3PbI3 and (b) (EDA)(FA)2[Pb3I10] film surfaces

Fig. 6 UV-Vis absorption spectra for (a) (EDA)(FA)2[Pb3I10] and (b) CH3NH3PbI3 films in a 35% RH environment after different storage times

Fig. 7 AFM images of (a) (EDA)(FA)2[Pb3I10] and (b) CH3NH3PbI3 films

References 17

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Fabrication and Characterization of High Stability (EDA)(FA)₂[Pb₃I₁₀] Layered Perovskite Film

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