Extending cathodoluminescence detection to infrared wavelengths
Gatan instrument used
The Monarc® Pro cathodoluminescence (CL) system, equipped with detectors and gratings optimized for high performance at infrared wavelengths, offers the most complete analysis of cathodoluminescence emission, extending the operational range up to 2,300 nm.
Background
CL systems are typically designed to provide optimum sensitivity and analysis capabilities for light emitted at or close to visible wavelengths. The design choices made in the selection of transfer optics, spectrometer configuration, and detectors determine the range of wavelengths that can be analyzed; low-performance systems may be limited to wavelengths between 400 – 800 nm, greatly limiting the scope of applications. High-performance systems such as the Monarc Pro system use optics and detectors that extend analysis capabilities to wavelengths from 200 – 1,100 nm. However, this still limits their potential to analyze many interesting materials and devices that emit light at longer wavelengths, including photovoltaic cells made of copper indium gallium selenide (CIGS) or optoelectronic devices based on group III–arsenide compound semiconductors. For this reason, we offer additional detection solutions to extend sensitivity up to 2,300 nm.
