用激光调阻法提高线列光导PbS焦平面探测器性能

首次在国内报道了用激光调阻法提高线列1×128光导PbS红外焦平面探测器性能的研究成果.针对PbS探测器芯片的特点,用激光调阻法对采用负载电阻分流型电路的焦平面探测器的背景输出电平进行平坦化研究.实验结果表明,用激光调阻使背景电平平坦化之后,通过优化器件的工作参数,探测器平均黑体响应率由4.45×106V/W提高到8.82×106V/W;平均黑体探测率由6.52×109cm·Hz1/2·W-1提高到1×1010cm·Hz1/2·W-1;动态范围由46 dB提高到52 dB.研究结果为今后的薄膜型焦平面探测器实用化提供了参考.

Performance improvement of PbS IR linear-array detector with its resistance tuned by laser

The background output of the PbS detector is determined by the ratio of the resistance of the detector to that of the reference at the input of the readout circuit. The performance of 1×128 linear photoconductive (PC) PbS infrared focal plane arrays (IRFPAs) was improved by tuning the resistance of the detector with laser. The background out-put of IRFPAs is reduced by tuning the resistance of the detector. As a result, the average responsivity and detectivity of the detector is increased from 4.45×106 V/W to 8.82×106 V/W, and 6.52×109 cm·Hz1/2·W-1 to 1×1010 cm· Hz1/2·W-1, respectively. The dynamic range is also increased from 46 dB to 52dB.