Sony has unveiled a new type of stacked CMOS sensor that uses “two-layer transistor pixels” to double the light gathering capability. Typical image sensors have the light-sensitive photodiodes and pixel transistors that control and amplify the signal on the same layer. via Technology and News Today https://www.engadget.com/sony-cmos-smartphone-sensor-2-layer-twice-as-much-light-112503027.html