Enhancement in structural and optical properties of Cd doped hybrid organic-inorganic halide perovskite CH3NH3Pb1-xCdxI3 photo-absorber

被引：15

作者：

Parrey, Khursheed Ahmad ^{[1
]}

Ansari, S. G. ^{[2
]}

Aziz, Anver ^{[1
]}

Niazi, Asad ^{[1
]}

机构：

[1] Jamia Millia Islamia, Dept Phys, Fac Nat Sci, New Delhi 110025, India

[2] Jamia Millia Islamia, Ctr Interdisciplinary Res Basic Sci, New Delhi 110025, India

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2020年 / 241卷

关键词：

Lead halide perovskite; Nanocrystalline; X-ray diffraction; Optical properties; Absorption coefficient; SOLAR-CELLS; LOW-COST; PERFORMANCE; MORPHOLOGY; EFFICIENCY; PHOTOLUMINESCENCE; EVOLUTION; CRYSTAL; ION; MICROSTRUCTURE;

D O I：

10.1016/j.matchemphys.2019.122387

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report the solution-based synthesis and material characterization of the Cd substituted hybrid organic-inorganic lead halide perovskite CH3NH3Pb1-xCdxI3 (x = 0.0, 0.03, 0.05, 0.08). Structure and morphology of the samples were investigated using XRD, FESEM and HRTEM techniques. XRD results confirmed a tetragonal perovskite structure (I4/mcm) through the doping range. Optical absorption, band gap and bonding character were studied by UV-visible, FTIR and photoluminescence spectroscopy. Oxidation states, binding energy and chemical composition were determined by XPS and EDAX. A low value of Urbach energy (similar to 14 meV) indicated high sample quality with low defects and trap states. The undoped samples had a direct energy gap of 1.56 eV, which reduced to 1.50 eV upon Cd doping. Most significantly, the absorption coefficient of CH3NH3Pb1-xCdxI3 remained high (similar to 10(3)) above 750 nun in the spectrally important infrared range as compared to CH3NH3PbI3, which approached zero. The enhanced structural and optical properties upon Cd doping make these materials promising photo absorber candidates compared to undoped CH3NH3PbI3.

引用

页数：10

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