APPLIED SURFACE SCIENCE
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2022
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IF 7.392
Jungang He,Mohan Yuan,Xia Wang,Xiao Chen,Xiang Peng,Liuyong Hu,Xue Zhao,Jing Liu,Jinghui Li,Kanghua Li,Chao Chen,Jiang Tang
Photodetectors with a broad spectral range play significant roles in optoelectronic applications. Introducing impurity atoms with the desired energy levels in semiconductors is an effective way to extend the spectral response range of photodetectors . Here, we demonstrate an extrinsic photodetector by introducing Ag + cations in methylammonium lead bromide (MAPbBr 3 ). The 5 % Ag-doped MAPbBr 3 single crystals exhibit excellent response with a high responsivity up to 0.56 A/W, a high detectivity of 2.22 × 10 10 jones, and a high response speed of 0.30 s/0.12 s under 700 nm wavelength illumination. Moreover, by the detailed investigation of the crystallinity and energy level distribution, we find that the Pb 2+ in MAPbBr 3 crystals is partially substituted by the Ag + impurities, which form the sensitive centers and thus induce the extrinsic response by the photo-carriers transition from the valence band to the sensitive centers. These results extend the spectral response region of perovskite optoelectronic applications and indicate the role of doping impurities with the desired energy level in improving the extrinsic response.
研究领域:
材料科学
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光学工程
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半导体物理
✓ 已验证
产品关联
DOI
高影响因子
Materials Chemistry Frontiers
·
2021
·Vol. 5
·期 24
·8319-8332
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IF 6.482
Zhanwei Zhou,Jiuyuan Xu,Yuxuan Liu,Chen Wei,Hengyang Zhang,Qun Wang
The B-site doping of organic–inorganic lead halide perovskites of the form MAPbX3 is not only an effective way to improve energy conversion (solar-electrical, thermal-electrical, solar-chemical, etc.) performance, but it is also eco-friendly, reducing the toxic Pb content. To the best of our knowledge, there are few reports on the photocatalytic and thermoelectric properties after the partial doping of Zn2+ into the Pb2+ lattice sites of perovskite MAPbBr3 crystals fabricated through a solvothermal route (Zn–MAPbBr3). Systematic characterization, including XRD, EDS, XPS, UV-vis, PL, N2 adsorption/desorption, Hall measurement, time-resolved photoluminescence measurement (TRPL), and electrochemical analysis, showed that the smaller Zn2+ guests increase the Goldschmidt tolerance and octahedral tilting factor of MAPbBr3 and enhance the carrier concentration, carrier mobility and conductivity, active site number, and oxidation abilities of Zn–MAPbBr3. Finally, Zn–MAPbBr3 crystals exhibited an improved absorption capacity and better photocatalytic degradation performance toward RhB dye and improved thermoelectric transportation properties, including better electrical conductivity and a more positive Seebeck coefficient, compared with pristine MAPbBr3.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
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2023
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IF 3.8
Xin Liu,Quanchao Zhang,Dou Zhao,Ruichen Bai,Yingying Hao,Bin Fang,Yinjie Ruan,Binbin Zhang,Tongyang Wang,Chongjian Zhou,Wanqi Jie,Yadong Xu
The organic–inorganic hybrid halide perovskite MAPbBr3 has been considered as a promising material in many applications; however, the bulk MAPbBr3 crystals grown by the widely adopted inverse temperature crystallization (ITC) method without forced convection reveal poor reproducibility and moderate quality. Here, we employ a near-net-shape seeded solution method to grow inch-sized MAPbBr3 crystals as a space-confined way to approach the suitable thickness and minimize the loss resulting by cutting and polishing. The rotation parameters for introducing forced convection is determined according to solute transport behavior, which is associated with the space confinement thickness and rotation rate. The as-grown MAPbBr3 crystal with good homogeneity exhibits a recorded FWHM value of 0.011° in the high-resolution X-ray diffraction rocking curve, ascribed to the lower grown-in stress and strain by the liquid-phase epitaxial growth. Finally, the MAPbBr3 semiconducting photodetector demonstrates a relatively high resistivity of 3.75 × 108 Ω·cm and superior photoresponse under 405 nm laser. The near-net-shape synthesis method with a space confinement is potentially extended to the growth of other halide perovskite bulk crystals.
研究领域:
材料科学
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光电材料
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晶体生长技术
✓ 已验证
产品关联
DOI
高影响因子
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