Cathodoluminescence imaging on quartz in sandstone

How to perform lifetime imaging using time-resolved cathodoluminescence?

Posted by Delmic on Mar 12, 2020 2:00:00 PM

What is time-resolved cathodoluminescence? How can performing lifetime mapping or a g(2) mapping add value to your research? In the video below Toon Coenen, product manager at Delmic, gives an explanation of this imaging technique and its applications.

 

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How can cathodoluminescence imaging modes enhance your research in 6 ways?

Posted by Delmic on Feb 19, 2020 12:30:00 AM

Cathodoluminescence is a great tool for obtaining valuable information about the properties of a sample, which can empower researchers and developers with a better understanding of possible defects, efficiency of the material and other properties. 

The SPARC cathodoluminescence detector has 6 imaging modes which can enhance your research and provide you with an important information about your samples. Keep reading if you would like to know what exactly the SPARC can benefit your research!

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How does cathodoluminescence for measuring photovoltaic materials work?

Posted by Delmic on Dec 10, 2019 1:30:00 PM

Are you interested in the possibilities of cathodoluminescence (CL) for photovoltaics (PV)? Are you eager to figure out how CL imaging works to measure and analyze thin-film solar cells and and other photovoltaic materials? For those who didn’t manage to join the webinar Cathodoluminescence for photovoltaics last month, the recording of this webinar is now available for you!

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Imaging biological specimens with correlative cathodoluminescence electron microscopy

Posted by Delmic on Oct 14, 2019 3:00:00 PM

Understanding of relationships between structure and function in biological specimen strongly depends on the imaging method. Achieving the proper balance between luminescence and high contrast to simultaneously study specific proteins but also to acquire ultrastructural information is one of the challenges of bioimaging. 

Correlative light and electron microscopy (CLEM) is an imaging technique for optoelectronic investigation of structure-function relationships at the nanoscale, which has gained importance in recent years. However, the strong mismatch between optical and electron imaging resolutions is still a limiting factor for CLEM. 

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Best microscopy techniques for studying CIGS thin-film solar cells

Posted by Delmic on Sep 23, 2019 2:48:00 PM

A copper indium gallium selenide (or CIGS), a direct bandgap semiconductor is being commonly used for solar cell production. Thin-film solar cells made with this structure have received a lot of attention from the photovoltaics community for exhibiting conversion efficiencies of almost up to 23%. 

Various microscopy techniques are commonly used to perform optoelectronic characterization of these highly relevant solar cell devices. These techniques include FIB-SEM investigations, for instance, which can help to investigate the high capability solar cells and do the material microstructure measurements. It is also quite common to use such techniques as electron backscatter diffraction, energy-dispersive X-ray spectrometry (EDX), electron-beam-induced current (EBIC). 

One extremely powerful technique for analysing Cu(In,Ga)Se2 layers in high-efficiency solar cells is cathodoluminescence (CL). It is particularly useful for observing the Ga/In gradient and how it influences the optoelectronic properties of Cu(In,Ga)Se2 layers. It is possible to use energy-dispersive X-ray spectrometry to observe local-band-gap energies, but cathodoluminescence can be a more efficient technique for direct access of these local optoelectronic quantities. 

Figure 1: SEM (a) and panchromatic CL images (b) acquired on the same identical area on a cross-section specimen prepared from a ZnO/CdS Cu(In,Ga)Se2/Mo/glass solar cell stack.

ZnO/CdS Cu(In,Ga)Se2/Mo/glass solar cell stack (Figure 1) was analysed with cathodoluminescence imaging at room temperature, and a CL spectrum was acquired in each pixel. While comparing the SEM and panchromatic CL images acquired on the same identical area it is possible to see that the CL intensity in neighbouring grains is different. These images also allow to conclude that the intensity is reduced at the grain boundaries due to enhanced nonradiative recombination. 

Moreover, peak shifts in the CL map reveal the distribution of the local band-gap energy/wavelength well. 

This experiment was performed by a research group from Helmholtz-Zentrum Berlin, which soon will host a workshop dedicated to studying photovoltaic materials with cathodoluminescence. The workshop will consist of several talks and hands-on sessions which will focus on the most relevant and advanced techniques for studying photovoltaic materials. The workshop is free and you can still register for it below.

Register for the workshop

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Best practice for studying plasmonic structures with microscopy

Posted by Delmic on Aug 8, 2019 2:03:39 PM

Plasmons have gained a lot of interest for their ability to strongly confine light to very small volumes, which makes the field of plasmonics so attractive. Various materials can be used in plasmonics, such as aluminium, gold, gallium, and others. One of the main advantages of plasmonic materials is their ability to enhance and direct emission, therefore, they can be successfully used for nanoantennas, sensing and local heating.

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Measuring time dynamics with time-resolved cathodoluminescence

Posted by Delmic on Jul 17, 2019 10:37:00 AM

Cathodoluminescence has established itself as a powerful technique for measuring and understanding various properties of light. In the previous blog posts, we explained how intensity mapping can be used to measure amplitude of the electromagnetic waves, hyperspectral CL for wavelength measurements, angle-resolved CL for wave vector, and polarimetry for polarization. These properties of light are not static, which means that there is time dynamics associated with light, which can also be studied. How? Keep reading!

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Polarization-filtered cathodoluminescence for studying nanostructured devices

Posted by Delmic on Jun 17, 2019 10:52:00 AM



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CL intensity mapping: ideal imaging technique for geological samples

Posted by Delmic on May 30, 2019 11:49:00 AM

One of the fastest and most straightforward techniques for understanding the composition and structure of geological samples is intensity mapping. What is it exactly? This imaging mode allows quickly obtaining cathodoluminescence contrast of the sample by acquiring CL intensity for every beam position. 

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The most modular cathodoluminescence detector: The SPARC

Posted by Delmic on May 15, 2019 1:30:00 PM



When adding the new equipment to the lab, it is important to consider a lot of various factors. One of such factors is how much experimental freedom the new system can offer. Not only it has to be configured specifically to cater your scientific needs, but also, ideally, it has to be modular in order to change as your experiments evolve. 

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Thoughts on the various applications, techniques, and complications to be discovered in the fascinating fields of both cathodoluminescence and correlative light and electron microscopy.

If you are interested in the solutions we offer, you can request a quote below.

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