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在讨论（HgCd）Te探测器耗尽层宽d和光吸收系a的基础上，导出了探测器截止波长的有效Franz－Keldvsh偏低△λce与a、d的关系式，说明了实验测定的△λce偏低的原因．
Based on the discussion of the depletion layer width d and the light absorption system a of the detector HgCdTe, the relation between the effective Franz-Keldvsh low △ λce and a, d of the detector cutoff wavelength is deduced. The experimentally determined △ λce low reason.