ACS Applied Energy Materials
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2018
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IF 0
Xiaolei Li,Bochao Li,Jianhui Chang,Bin Ding,Shuaizhi Zheng,Yiwei Wu,Junliang Yang,Guanjun Yang,Xiangli Zhong,Jinbin Wang
The toxicity and the instability of lead-based perovskites might eventually hamper the commercialization of perovskite solar cells. Here, we present the optoelectronic properties and stability of a two-dimensional layered (C6H5CH2NH3)2CuBr4 perovskite. This material has a low Eg of 1.81 eV and high absorption coefficient of ∼1 × 105 cm–1 at the most intensive absorption at 539 nm, implying that it is suitable for light-harvesting in thin film solar cells, especially in tandem solar cells. Furthermore, X-ray diffraction (XRD), ultraviolet–visible (UV–vis) absorption spectra, and thermogravimetric analysis (TGA) confirm the high stability toward humidity, heat, and ultraviolet light. Initial studies produce a mesoscopic solar cell with a power conversion efficiency of 0.2%. Our work may offer some useful inspiration for the further investigation of environment-friendly and stable organic–inorganic perovskite photovoltaic materials.
研究领域:
材料科学
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光伏技术
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能源研究
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DOI
Journal of Materials Chemistry C
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2020
·Vol. 8
·期 22
·7322-7329
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IF 7.059
Da Chen,Fulong Dai,Shiqiang Hao,Guojun Zhou,Quanlin Liu,Christopher Wolverton,Jing Zhao,Zhiguo Xia
Organic–inorganic hybrid metal halides have received extensive attention owing to their versatile structures and optoelectronic properties. Herein, we report two lead-free metal halides, (PMA)3BiBr6 and (PMA)3SbBr6 [PMA+: (C6H5CH2NH3)+, as the abbreviation of phenylmethylammonium], which possess iso-structural zero-dimensional structures and crystallize in the monoclinic space group P21/c. (PMA)3BiBr6 and (PMA)3SbBr6 exhibit optical band gaps of ∼3.50 and 3.40 eV, respectively, and density functional theory calculations reveal their indirect bandgap behaviors. Upon 350 and 425 nm excitation, (PMA)3BiBr6 and (PMA)3SbBr6 exhibit broadband emission peaking at 510 nm and 625 nm with wide full-widths at half-maximum of ∼153 and 175 nm, respectively. The emission mechanism of the metal halides is attributed to self-trapped exciton emission. The relationship between the crystal structure and luminescence intensity is also discussed. Finally, both metal halides have high decomposition temperatures and are stable for long-term storage under ambient conditions, demonstrating their potential for optoelectronic applications.
研究领域:
材料科学
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光学
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DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2023
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IF 3.3
Shuang Chen,Yin Zhu,Xiaopeng Wei,Guoyuan Zheng,Qiule Zhao,Shuyi Mo,Jilin Wang,Disheng Yao,Nan Tian,Fei Long
A novel bismuth-based zero-dimensional organic-inorganic hybrid material (C 6 H 5 CH 2 NH 3 ) 2 (CH 3 CH 3 NH 2 ) 3 Bi 2 Br 11 was synthesized by a hydrothermal method . The crystal structure, intermolecular interactions , chemical groups, chemical bond characterization, optical and thermal stability of the sample were systematically investigated by single crystal X-ray diffraction, powder X-ray diffraction, Hirshfeld surface analysis, field scanning electron microscopy, Fourier transform infrared spectrometer, Raman spectra , thermogravimetric analysis , and Ultraviolet–visible diffuse reflectance spectra. The results indicated that the (C 6 H 5 CH 2 NH 3 ) 2 (CH 3 CH 3 NH 2 ) 3 Bi 2 Br 11 crystal displayed a triclinic crystal system with a P-1 space group at room temperature with a = 8.5290(4) Å, b = 14.2484(10) Å, c = 18.9386(10) Å, α = 94.418(5) °, β = 102.260(4) °, γ = 106.595(5) °, V = 2131.9(2) Å 3 , Z = 2, R 1 = 0.0936, w R 2 = 0.1536. The compound displayed typical zero-dimensional consisting of two benzylamine organic [C 6 H 5 CH 2 NH 3 ] + cations, three dimethylamine organic [CH 3 CH 3 NH 2 ] + cations and a corner-sharing dimer unit [Bi 2 Br 11 ] 5– . Infrared and Raman vibrational study indicates the presence of [CH 3 CH 3 NH 2 ] + . The 2D fingerprint plot of Hirshfeld surface analysis shows that H⋯Br/Br⋯H (56.8 %) and H⋯H (31.4 %) are major contributions to the intermolecular contact of (C 6 H 5 CH 2 NH 3 ) 2 (CH 3 CH 3 NH 2 ) 3 Bi 2 Br 11 . The sample presented relatively perfect thermal stability up to 240 °C and a wide band gap of about 2.75 eV. It provides some reference value for exploring organic-inorganic hybrid materials with low toxicity and high thermal stability.
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高影响因子
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