62 -as-deposited 1 half-stack as-deposited 0.5 _^ ~ full-stack 0 2-3)0 -200 -100 100 300 -annealed half-stack 1 C,4 full-stack r,30 0 / 100 200 4 Voltage (V) b) Fig 4.6 Q-V data at V40 from (a) as-deposited, (b) annealed ZnS:ErFnnealed half-stack vs. full- stack devices. e "------ ------ 0) / A stack devices.