无机材料学报 ›› 2016, Vol. 31 ›› Issue (10): 1129-1134.DOI: 10.15541/jim20160156

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高稳定性(EDA)(FA)2[Pb3I10]层状钙钛矿薄膜的制备与表征

高延敏1, 姜文龙1, 2, 杨铁莹2, 左银泽1   

  1. (1. 江苏科技大学 材料科学与工程学院, 镇江 212003; 2. 中国科学院 上海应用物理研究所, 上海 201204)
  • 收稿日期:2016-03-21 修回日期:2016-04-13 出版日期:2016-10-20 网络出版日期:2016-09-23
  • 基金资助:
    江苏科技大学研究生科研创新基金(YCX11S-24);国家自然科学基金(U1332205)

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

GAO Yan-Min1, JIANG Wen-Long1, 2, YANG Tie-Ying2, ZUO Yin-Ze1   

  1. (1. The college of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China; 2. Shanghai Institute of Applied Physics, Chinese Academy of Science, Shanghai 201204, China)
  • Received:2016-03-21 Revised:2016-04-13 Published:2016-10-20 Online:2016-09-23
  • Supported by:
    Scientific Research Foundation of Graduate School of Jiangsu University of Science and Technology(YCX11S-24);National Natural Science Foundation of China(U1332205)

摘要:

为了提高钙钛矿太阳能电池在潮湿环境中的稳定性, 采用一步法, 通过在DMF中混合(EDA)I2、(FA)I和PbI2, 将乙二胺离子引入钙钛矿晶格, 成功制备了一种具有较高稳定性的二维片层状的钙钛矿结构薄膜。通过原位掠入射X射线衍射(GIXRD)、X射线衍射(XRD)、扫描电子显微镜(SEM)、紫外-可见吸收光谱(UV-Vis)和原子力显微镜(AFM)等方法检测分析(EDA)(FA)2[Pb3I10]在低湿度及高湿度环境下的结构、形貌以及光学性能变化。结果表明: 制备的 (EDA)(FA)2[Pb3I10]薄膜在相同湿度环境下比当前广泛应用于钙钛矿太阳能电池的甲胺铅碘薄膜(CH3NH3PbI3)稳定性更高; 薄膜的光学带隙约为1.67 eV, 与太阳能电池最佳带隙比较接近。另外, (EDA)(FA)2[Pb3I10]薄膜在可见光范围吸光性能较好; 薄膜的粗糙度很小, 适合制备太阳能电池, 而且, 成本较硅基太阳能电池低廉, 在分子水平较CH3NH3PbI3的可调谐性更大, 使钙钛矿太阳能电池在未来大面积应用成为可能。

关键词: 一步法, 钙钛矿, 掠入射X射线衍射, 乙二胺甲脒铅碘

Abstract:

A new two-dimensional layered hybrid perovskite solar-cell absorber was synthesized by one-step method, using (EDA)I2, (FA)I, and PbI2 with 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 CH3NH3PbI3 were 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]

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