- The nanoIR system provides nanoscale IR spectra of photovoltaic materials, and correlates to conventional IR spectral databases
- AFM-IR is able to detect phase separation in organic photovoltaic materials by correlating local chemical analysis with topographical information
- The relative material stiffness within a defected region of a material can be mapped and analyzed via IR chemical contrast imaging
Application Note 151: 2D Materials Characterization Using Nanoscale FTIR Spectroscopy and Near-field Imaging
- 2D materials are an important emerging field of research due to their unique properties for applications in photovoltaics, semiconductors, battery technology and many other areas.
- The Anasys nanoIR3-s system provides two complementary nanoscale FTIR techniques for spectroscopy and near-field imaging, scattering-scanning near-field optical microscopy (s-SNOM) and photothermal AFM-Infrared (AFM-IR).
Application Brief: Direct Observation of Oxygen Configuration on Individual Graphene Oxide Sheets
- AFM-IR was used to map oxygen bonding on graphene oxide sheets
- Oxygen bonding was observed most often on the edges of graphene oxide sheets, in areas where graphene is folded, and in discrete domains
- An updated structural model for graphene oxide was proposed, with C=O on its edge and plane
- Determining atomic position and configuration from precise imaging offers the possibility to link nanoscale structure and composition with material function
Application Brief: Chloride Incorporation Process in CH3NH3PbI3–xClx Perovskites via Nanoscale Bandgap Maps
- CH3NH3PbI3-xClx perovskites enable the creation of highly efficient solar cells
- PTIR was used in this study to measure the bandgap of CH3NH3PbI3-xClx films and determine local chloride content
- Despite small chloride content, CH3NH3PbI3-xClx films showed better thermal stability than CH3NH3PbI3 films fabricated by the same method
Application Brief: Experimental Demonstration of the Microscopic Origin of Circular Dichroism in Two-Dimensional Metamaterials
- AFM-IR and s-SNOM have been used in combination to probe the role of chirality in the circular dichroism observed in nanoscale 2D metasurfaces
- By accessing both the radiative (s-SNOM) and non-radiative (AFM-IR) information on plasmonics structures, unique and complementary plasmonic properties can be obtained.
- s-SNOM is used to map the optical energy distribution of 2D metasurfaces.
- AFM-IR is used to detect the Ohmic heating in the structure.
- For the first time, it has been conclusively established the circular dichroism observed in 2D metasurfaces is attributed to handedness dependent Ohmic heating.
Application Brief: CH3NH3PbI3 Perovskites: Ferroelasticity Revealed
- AFM-IR was used to find evidence of ferroelasticity in CH3NH3PbI3 polycrystalline films and crystals
- No evidence of conomitant ferroelectricity was observed
- The configuration of ferroelastic domains can be controlled with applied stress
Application Brief: Tip-Enhanced Infrared Nanospectroscopy via Molecular Expansion Force Detection
- AFM-IR collects spectra of molecular monolayers and monolayer islands with high spatial resolution
Application Brief: Touching Is Believing: Interrogating Halide Perovskite Solar Cells at the Nanoscale via Scanning Probe Microscopy
- Halide perovskite solar cells are an exciting development in the next generation photovoltaic technologies
- There is need for a method to investigate the local photovoltaic properties of halide perovskite solar cells that can be directly traced to their microstructures and device performance
- AFM-IR has great potential to realize such promises at the nanoscale, and highlight some of the recent progresses and challenges along this line of investigation toward local probing of photocurrent, work function, ionic activities, polarization switching, and chemical degradation