Taylor Ray

Title of Work: 

Investigation of the Properties of Perovskite Semiconductors using Coherent Spectroscopy and Photon Echo

Abstract:

As silicon solar cells reach their limits, perovskite has emerged as a promising material with potential to complement existing technology by increasing the proportion of usable solar energy. Perovskites have many advantages for photovoltaic technology, but are still far from being sufficiently researched. A main goal of this project is to deepen our understanding of perovskite semiconductors. In this research, we will investigate the hybrid lead halide perovskite MAPbBr3, as hybrid lead halide perovskites have been shown to absorb visible light very well. We used coherent spectroscopy for this, namely transient four-wave mixing together with photon echo. This allowed us to discover further properties of this material and identify where additional testing is needed.

Title of Work (Global Language):  

Untersuchung der Eigenschaften von Perowskit-Halbleitern mittels kohärenter Spektroskopie und Photonen-Echo

Abstract (Global Language):

Da Silizium-Solarzellen an ihre Grenzen stoßen, ist Perowskit zum Vorschein gekommen als ein vielversprechendes Material, dass das Potenzial hat, die bestehende Technologie zu ergänzen, indem es den Anteil der nutzbaren Sonnenenergie erhöht. Perowskite haben viele Vorteilen für Photovoltaiktechnologie, aber sind jedoch noch lange nicht ausreichend erforscht. Ein Hauptziel dieses Projekts ist es, das Verständnis von Perowskit-Halbleitern zu vertiefen. Wir werden in dieser Forschung nämlich die Hybride Blei-Halogenid-Perowskit MAPbBr3 untersuchen, denn Hybride Blei-Halogenid-Perowskite haben gezeigt, dass sie sichtbares Licht sehr gut absorbieren können. Wir haben dafür kohärente Spektroskopie benutzt, nämlich Transient-Four-Wave-Mixing zusammen mit Photon-Echo. Dadurch haben wir weitere Eigenschaften dieses Materials entdeckt und festgestellt, wo zusätzliche Tests erforderlich sind.

Elevator Pitch Video Transcript

Hi, my name is Taylor Ray and I am an IGP student studying physics and German. I spent the

last year at the University of TU Dortmund, and while there I worked in one of their

experimental physics labs. This lab was a quantum optics lab which means we looked at the

smallest scale and we used light to investigate this scale. We were specifically looking at this

material called perovskite because it is a possible candidate to be combined with silicon to make

better, more effective solar cells.

Now, there are many ways to combat climate change, but one of the most widely developed and

most widely implemented is renewable energy. However, our current technology using silicon

for solar cells is at its theoretical limits and changes need to be made if we want to widen the

scale and get solar energy implemented around the world. One solution that is being looked at is

known as tandem solar cells, which means we are combining silicon with another material that

can help improve its efficiency. And by efficiency, I mean how much light from the sun and how

much energy from the sun it can convert into energy that we can actually use. So perovskite is a

crystal that when combined with silicon can possibly improve the effectiveness of solar cells.

However, this is a very new idea so perovskite still needs to be investigated and better

understood before we do this kind of work to create these solar cells. So the lab that I worked in

used techniques known as coherent spectroscopy to investigate perovskite and we specifically

used a technique known as photon echo.

Now if you want to know more about photon echo and how we used it to look at perovskite you

can come down to my summit poster, “Investigating the properties of perovskite semiconductors

using coherent spectroscopy and photon echo”.

Thank you.

Digital Poster