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

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).

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Time-resolved THz spectroscopy of metal-halide perovskite single crystals and polycrystalline thin films

2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) ◽

10.1109/irmmw-thz.2019.8874292 ◽

2019 ◽

Author(s):

Chelsea Q. Xia ◽

Qianqian Lin ◽

Jay B. Patel ◽

Adam D. Wright ◽

Timothy W. Crothers ◽

...

Keyword(s):

Thin Films ◽

Single Crystals ◽

Metal Halide ◽

Thz Spectroscopy ◽

Time Resolved ◽

Polycrystalline Thin Films ◽

Metal Halide Perovskite ◽

Halide Perovskite

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Luminescence spectroscopy of lead-halide perovskites: materials properties and application as photovoltaic devices

Journal of Materials Chemistry C ◽

10.1039/c7tc00669a ◽

2017 ◽

Vol 5 (14) ◽

pp. 3427-3437 ◽

Cited By ~ 72

Author(s):

Yoshihiko Kanemitsu

Keyword(s):

Thin Films ◽

Optical Properties ◽

Solar Cell ◽

Single Crystals ◽

Luminescence Spectroscopy ◽

Photovoltaic Devices ◽

Materials Properties ◽

Halide Perovskites ◽

Halide Perovskite ◽

Lead Halide

This review summarizes the optical properties of lead-halide-perovskite thin films, single crystals, and solar-cell devices.

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Nanometer-Thick [(FPEA)2PbX4; X=I, Br] 2D Halide Perovskite Based Thin Films for Pollutant Detection and Nonconventional Photocatalytic Degradation

Materials Advances ◽

10.1039/d1ma00561h ◽

2021 ◽

Author(s):

Arindam Mondal ◽

Akash Lata ◽

Aarya Prabhakaran ◽

Satyajit Gupta

Keyword(s):

Thin Films ◽

Photocatalytic Degradation ◽

Three Dimensional ◽

Two Dimensional ◽

Reduced Dimensionality ◽

P Application ◽

Halide Perovskites ◽

Halide Perovskite ◽

Pollutant Detection

Application of three-dimensional (3D)-halide perovskites (HaP) in photocatalysis encourages the new exercise with two-dimensional (2D) HaP based thin-films for photocatalytic degradation of dye. The reduced dimensionality to 2D-HaPs, with a...

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Developments in Using Scanning Probe Microscopy to Study Molecules on Surfaces — From Thin Films and Single-Molecule Conductivity to Drug-Living Cell Interactions

ChemInform ◽

10.1002/chin.200639277 ◽

2006 ◽

Vol 37 (39) ◽

Author(s):

Pall Thordarson ◽

Rob Atkin ◽

Wouter H. J. Kalle ◽

Gregory G. Warr ◽

Filip Braet

Keyword(s):

Thin Films ◽

Single Molecule ◽

Scanning Probe Microscopy ◽

Living Cell ◽

Cell Interactions ◽

Scanning Probe ◽

Probe Microscopy

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Optoeletronic investigation of Cu2ZnSn(S,Se)4 thin-films & Cu2ZnSn(S,Se)4/CdS interface with scanning probe microscopy

Science China Chemistry ◽

10.1007/s11426-015-5444-4 ◽

2015 ◽

Vol 59 (2) ◽

pp. 231-236 ◽

Cited By ~ 3

Author(s):

Jiangjun Li ◽

Yugang Zou ◽

Ting Chen ◽

Jinsong Hu ◽

Dong Wang ◽

...

Keyword(s):

Thin Films ◽

Scanning Probe Microscopy ◽

Scanning Probe ◽

Probe Microscopy

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Comprehensive Elucidation of Grain Boundary Behavior in All‐Inorganic Halide Perovskites by Scanning Probe Microscopy

Advanced Materials Interfaces ◽

10.1002/admi.201901521 ◽

2020 ◽

Vol 7 (7) ◽

pp. 1901521 ◽

Cited By ~ 1

Author(s):

Yanyan Wang ◽

Ziyang Hu ◽

Can Gao ◽

Cheng Yang ◽

Jing Zhang ◽

...

Keyword(s):

Grain Boundary ◽

Scanning Probe Microscopy ◽

Boundary Behavior ◽

Scanning Probe ◽

Probe Microscopy ◽

Halide Perovskites

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Comment on “ferroelectricity-free lead halide perovskites” by A. Gómez, Q. Wang, A. R. Goñi, M. Campoy-Quiles and A. Abate, Energy Environ. Sci., 2019, 12, 2537

Energy & Environmental Science ◽

10.1039/c9ee04159a ◽

2020 ◽

Vol 13 (6) ◽

pp. 1888-1891

Author(s):

Alexander Colsmann ◽

Tobias Leonhard ◽

Alexander D. Schulz ◽

Holger Röhm

Keyword(s):

Thin Films ◽

Metal Halide ◽

Organic Metal ◽

Metal Halide Perovskite ◽

Halide Perovskites ◽

Halide Perovskite ◽

Lead Halide ◽

Energy Environ

This comment analyzes pitfalls when investigating piezoresponse and ferroelectricity in organic-metal halide perovskite thin films.

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Laser Induced Nanofabrication on Titanium Thin Films

MRS Proceedings ◽

10.1557/proc-397-625 ◽

1995 ◽

Vol 397 ◽

Author(s):

B.D. Huey ◽

D.A. Bonnell ◽

A.D. Akhsakhalian ◽

A.A. Gorbunov ◽

A. Sewing ◽

...

Keyword(s):

Thin Films ◽

Scanning Probe Microscopy ◽

Optical Resolution ◽

Diffraction Limit ◽

Scanning Probe ◽

Nanometer Scale ◽

Ion Laser ◽

Titanium Thin Films ◽

Novel Structures ◽

Argon Ion

ABSTRACTIllumination of titanium thin films with an argon-ion laser has been used to fabricate nanometer scale features by localized oxidation. The laser induces a temperature gradient in the metal film, within which oxidation may occur. Due to the non-linearity of the reaction with temperature, the reaction zone can be laterally confined to regions narrower than the diffraction limit of optical resolution. Scanning probe microscopy indicates widths ranging from 105 to 600 nm and heights of 0.8 to 30 nm. The possibility of forming novel structures is demonstrated.

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