Improving solar cells for a brighter future (pun intended)

“If you want to change the world, even if you can’t, at least you die trying.” – Such were the words emblazoned above the door of my office at LIMNO (Laboratory for Molecular Engineering of Optoelectronic Nanomaterials – led by Prof. Kevin Sivula), which was the lab I spent my 3 months of summer at. EPFL was one of the universities I had always wanted to visit, largely due to its location in the French-speaking part of Switzerland (cheese + chocolate + views!), as well as their prowess on new generation solar cells. New generation solar cells such as perovskite photovoltaics have the advantage of being produced via solution-processing methods, which means a cheaper and less energy-intensive fabrication process compared to the standard silicon solar cells currently dominating the market. For my project, I looked at the impact of various factors on the morphology of quasi-2D Pb-based perovskites, and how the different treatment methods could affect solar cell performance. Working on this research at LIMNO led me to realize how lucky I was to have gotten this opportunity. The lab environment was really like an embodiment of the quote; my lab mates were all very motivated, passionate and eager to help each other out. Thanks to their welcoming and friendly nature, I had an amazing and fruitful time with my lab!

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Dinner with my wonderful lab

Other than the lab work, I spent a lot of my time in Switzerland hiking. Since most shops are often closed on Sunday, and close quite early on Saturdays, I ended up going hiking and sight-seeing at various places with the other interns. Although this has been mentioned by the previous interns as well, I would definitely recommend purchasing the Half-fare card as you can easily make the money back within several weeks. Also, downloading the SBB app is useful as sometimes they will have ‘supersaver’ tickets, which are discounted tickets for certain journeys available when purchased earlier online.

Places I would recommend visiting (despite the distance) are the Rhine Falls for the Swiss National Day firework celebrations, Aletsch for the glacier trail (before global warming gets to it!), Oeschinensee for the beautiful lake, Gruyère for the chocolate and cheese factories, Creux du Van for the ‘Swiss Grand Canyon’, Lugano for the risotto and gelato, Montreux for the Jazz Festival, and Zermatt for the almighty Matterhorn (on a clear day!). In particular, for those who like water sports, taking a dip, stand-up paddleboarding, kayaking in Lake Geneva (or any of the other lakes) are all definitely recommended. Switzerland also has some wonderful thermal baths for relaxing in, such as Brigerbad and Lavey-les-bains, which are nice for when you want to wind down and chill during the weekends.

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Overall, I had a brilliant time in Switzerland thanks to all the fantastic people I met.

I’ll be back!

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Matterhorn, Zermatt

Narumi Nagaya Wong, Imperial College London
Laboratory for Molecular Engineering of Optoelectronic Nanomaterials (LIMNO), EPFL

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