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PbS MIS器件的实验研究结果说明研制单片两维红外电荷耦合成象器件(CCID)是可能的。这种电荷耦合成象器件可在77K工作,并具有直到3.5微米左右的中等成象灵敏度。测量了用热分解SiO_2。绝缘介质制备的MIS电容器,证明PbS表面电势可随通过反转累积起来的偏压而变化。界面态密度为～1×10~(12)厘米~(-2)电子伏~(-1),在77K时的存储时间为2秒左右。计算说明有效电荷转移必须在外加零电平电荷(即“肥零”工作)时才可达到,而成象灵敏度也许将受可达到的均匀度控制。
The experimental results of PbS MIS devices show that it is possible to develop a monolithic two-dimensional infrared charge coupled imaging device (CCID). This charge coupled imaging device operates at 77K and has moderate imaging sensitivity up to about 3.5 microns. The thermal decomposition of SiO 2 was measured. MIS capacitors made of insulating media demonstrate that the PbS surface potential can vary with the bias voltage that is accumulated by inversion. The interface state density is ~ 1 × 10 ~ (12) cm ~ (-2) eV ~ (-1), and the storage time at 77K is about 2 seconds. Calculations indicate that effective charge transfer must be achieved with the application of zero-level charge (ie, “fat zero” operation), and imaging sensitivity may be controlled by achievable uniformity.