Samsung introduced the ISOCELL line of image sensors in 2013, which featured barriers surrounding each pixels to reduce color crosstalk (light for one pixel bleeding into its neighbors). The original design used metal for these walls that absorbed some of the incoming light. This was partially addressed with ISOCELL Plus by switching to a new material. But that still contained some metal, so it didn’t fully solve the issue. Today Samsung is offering a peek at the next phase of its image sensor technology. ISOCELL 2.0 replaces the lower part of the walls with a more reflective material....
Source: https://www.gsmarena.com/samsung_announces_isocell_20_with_improved_light_gathering_abilities-news-48045.php
