Ultrafast ion migration in hybrid perovskite polycrystalline thin films under light and suppression in single crystals

2016 ◽  
Vol 18 (44) ◽  
pp. 30484-30490 ◽  
Author(s):  
Jie Xing ◽  
Qi Wang ◽  
Qingfeng Dong ◽  
Yongbo Yuan ◽  
Yanjun Fang ◽  
...  
Keyword(s):  
Thin Films ◽  
Single Crystals ◽  
Migration Behavior ◽  
Ion Migration ◽  
Polycrystalline Thin Films ◽  
Hybrid Perovskite ◽  
Light Stability ◽  
Effect Of Light

This study reveals the important effect of light on ion migration behavior and morphology dependent light stability.

Light-Enhanced Spin Diffusion in Hybrid Perovskite Thin Films and Single Crystals

2019 ◽  
Vol 12 (2) ◽  
pp. 3205-3213 ◽  
Author(s):  
Feng Li ◽  
Junfeng Ding ◽  
Weili Yu ◽  
Xinwei Guan ◽  
Peng Wang ◽  
...  
Keyword(s):  
Thin Films ◽  
Single Crystals ◽  
Spin Diffusion ◽  
Hybrid Perovskite

scholarly journals Strain-activated light-induced halide segregation in mixed-halide perovskite solids

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Yicheng Zhao ◽  
Peng Miao ◽  
Jack Elia ◽  
Huiying Hu ◽  
Xiaoxia Wang ◽  
...  
Keyword(s):  
Thin Films ◽  
Single Crystals ◽  
Scanning Probe Microscopy ◽  
Strain Distribution ◽  
Scanning Probe ◽  
Uniaxial Pressure ◽  
Free Standing ◽  
Polycrystalline Thin Films ◽  
Halide Perovskites ◽  
Halide Perovskite

AbstractLight-induced halide segregation limits the bandgap tunability of mixed-halide perovskites for tandem photovoltaics. Here we report that light-induced halide segregation is strain-activated in MAPb(I1−xBrx)3 with Br concentration below approximately 50%, while it is intrinsic for Br concentration over approximately 50%. Free-standing single crystals of CH3NH3Pb(I0.65Br0.35)3 (35%Br) do not show halide segregation until uniaxial pressure is applied. Besides, 35%Br single crystals grown on lattice-mismatched substrates (e.g. single-crystal CaF2) show inhomogeneous segregation due to heterogenous strain distribution. Through scanning probe microscopy, the above findings are successfully translated to polycrystalline thin films. For 35%Br thin films, halide segregation selectively occurs at grain boundaries due to localized strain at the boundaries; yet for 65%Br films, halide segregation occurs in the whole layer. We close by demonstrating that only the strain-activated halide segregation (35%Br/45%Br thin films) could be suppressed if the strain is properly released via additives (e.g. KI) or ideal substrates (e.g. SiO2).

The intrinsic properties of FA(1−x)MAxPbI3 perovskite single crystals

2017 ◽  
Vol 5 (18) ◽  
pp. 8537-8544 ◽  
Author(s):  
Yuan Huang ◽  
Liang Li ◽  
Zonghao Liu ◽  
Haoyang Jiao ◽  
Yuqing He ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Single Crystals ◽  
Migration Behavior ◽  
Intrinsic Properties ◽  
Ion Migration

We provided a systematical investigation to correlate the crystal structure, composition, mobility, and ion migration behavior to the ratio of MA+/FA+ in FA(1−x)MAxPbI3 single crystal.

Electron diffraction studies of amorphous and polycrystalline thin films

1990 ◽  
Vol 48 (4) ◽  
pp. 118-119
Author(s):  
D J H Cockayne ◽  
D R McKenzie
Keyword(s):  
Thin Films ◽  
Electron Diffraction ◽  
Polycrystalline Materials ◽  
Good Resolution ◽  
Scattered Intensity ◽  
Radial Density ◽  
X Ray ◽  
Polycrystalline Thin Films ◽  
Nitrogen Ion ◽  
Diffraction Patterns

The study of amorphous and polycrystalline materials by obtaining radial density functions G(r) from X-ray or neutron diffraction patterns is a well-developed technique. We have developed a method for carrying out the same technique using electron diffraction in a standard TEM. It has the advantage that studies can be made of thin films, and on regions of specimen too small for X-ray and neutron studies. As well, it can be used to obtain nearest neighbour distances and coordination numbers from the same region of specimen from which HREM, EDS and EELS data is obtained.The reduction of the scattered intensity I(s) (s = 2sinθ/λ ) to the radial density function, G(r), assumes single and elastic scattering. For good resolution in r, data must be collected to high s. Previous work in this field includes pioneering experiments by Grigson and by Graczyk and Moss. In our work, the electron diffraction pattern from an amorphous or polycrystalline thin film is scanned across the entrance aperture to a PEELS fitted to a conventional TEM, using a ramp applied to the post specimen scan coils. The elastically scattered intensity I(s) is obtained by selecting the elastically scattered electrons with the PEELS, and collecting directly into the MCA. Figure 1 shows examples of I(s) collected from two thin ZrN films, one polycrystalline and one amorphous, prepared by evaporation while under nitrogen ion bombardment.

Electrical and photoelectrical characterization of GaAsxSy polycrystalline thin films

1997 ◽  
Vol 296 (1-2) ◽  
pp. 114-117 ◽  
Author(s):  
O. Pesty ◽  
P. Canet ◽  
F. Lalande ◽  
H. Carchano ◽  
D. Lollman
Keyword(s):  
Thin Films ◽  
Polycrystalline Thin Films

Transport mechanisms in Co-doped ZnO (ZCO) and H-irradiated ZCO polycrystalline thin films

2021 ◽  
Vol 23 (3) ◽  
pp. 2368-2376
Author(s):  
A. Di Trolio ◽  
A. Amore Bonapasta ◽  
C. Barone ◽  
A. Leo ◽  
G. Carapella ◽  
...  
Keyword(s):  
Thin Films ◽  
Opposite Effect ◽  
Transport Mechanisms ◽  
Co Doping ◽  
Polycrystalline Thin Films ◽  
Doped Zno ◽  
Co Doped

Co doping increases the ZnO resistivity (ρ) at high T (HT), whereas it has an opposite effect at low T (LT). H balances the Co effects by neutralizing the ρ increase at HT and strengthening its decrease at LT.

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