So, obviously, there's a difference between efficiency in lab settings and efficiency in the field for mass-produced cells. But - this is an impressive achievem

So, obviously, there's a difference between efficiency in lab settings and efficiency in the field for mass-produced cells. But - this is an impressive achievement for the Silicon + Perovskite technology. But I have a question to the more knowledgeable here: The chart in the story shows other technologies which achieve significantly higher efficiency figures: https://www.helmholtz-berlin.de/pubbin/news_datei?did=15092 https://www.helmholtz-berlin.de/pubbin/news_datei?did=15092 specifically, multi-junction cells. Why are they faded-out? Are they not practicable to mass produce and deploy? Only usable in limited scenarios? ---- Partial self-answer: According to Wikipedia, https://en.wikipedia.org/wiki/Multi-junction_solar_cell https://en.wikipedia.org/wiki/Multi-junction_solar_cell > As of 2014 multi-junction cells were expensive to produce, using techniques similar to semiconductor device fabrication, usually metalorganic vapour phase epitaxy but on "chip" sizes on the order of centimeters.