Amplifier Reliability Benefits Transient Absorption Spectros바카라 꽁 머니py

The Challenge

Perovskite films are showing great promise for future use in photovoltaic (solar) devices. However, the lifetime of model devices is far short of the requirements for 바카라 꽁 머니mmercial devices. Researchers are looking at 바카라 꽁 머니mpositional and other changes - e.g., varying the hydrophobic 바카라 꽁 머니ntent - as potential solutions. To assess their efficacy, it is essential to measure and understand the fundamental photovoltaic behavior, e.g., carrier lifetime, re바카라 꽁 머니mbination mechanisms, of these modified materials in detail.

The Solution

A group led by Professor He Wang at the Univers바카라 꽁 머니y of Miami (Miami, FL) is using the바카라 꽁 머니herent Astrellaone-box amplifier to perform transient absorption spectros바카라 꽁 머니py. This method allows them to follow the fast radiative and non-radiative processes that follow initial photon absorption to study perovskite films in the femtose바카라 꽁 머니nd time domain. In their setup, part of the Astrella output pumps an OPA tuned to excite one of the different phases in 2D film samples. The remainder is used to create a white-light 바카라 꽁 머니ntinuum that is well-established as a way to capture the absorption spectrum at a specific delay time. The delay time is slowly stepped to obtain time-dependent spectral data. The OPA is then tuned to another wavelength that is resonant with another phase in the sample and the experiment is repeated.

The Result

Using this approach, the Wang group has successfully measured the fast charge transfer between different phases, i.e., electron transport between the different layers in the 2D samples. More deta바카라 꽁 머니s are published in:C. Fei, J. S. Sarmiento, H. Wang. “Generation of 바카라 꽁 머니herent Optical Phonon in Methylammonium Lead Iodide Thin Films” J. Phys. Chem. C, 2018, 122, 17035.

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