Ångström noticed that the bright lines in the solar spectrum had wavelengths that were whole multiples of a small unit, which he defined as 10-10 meters. This unit was later named the angstrom in his ...

Polaron formation in perovskite solar cells has been indicated ... they have a very small size of a few angstroms (an angstrom is one 10-billionth of a meter) but then rapidly expand outward ...