摘要:
利用波段内连续激光,辐照禁带宽度为0.33 eV的中波光伏碲镉汞探测器.实验结果表明,随着辐照激光光强的逐渐增大,探测器从线性响应过渡为非线性响应.当探测器进入非线性状态,探测器的开路电压随激光光强的增大而减小,且在激光开启辐照时开路电压信号迅速下跳,在激光停止辐照时开路电压信号迅速上跳.通过考虑激光辐照下探测器的温度场分布以及温度对p-n结内建电场的影响,结合考虑机械快门在开启和关闭时对激光光强变化的影响,建立了光伏探测器在波段内连续激光辐照下的解析模型,模型计算结果与实验结果吻合得较好.研究表明,激光辐照过程中的非线性响应,主要由温度对p-n结内建电场的影响决定,激光开启和关闭时的开路电压的幅值是由光强和温度共同决定.
Abstract:
The medium wave HgCdTe photovoltaic detector （band gap ,-0.33 eV） is irradiated by a CW band-in laser. The experimental results are shown that the detector enter into nonlinear response state as the incidence laser power increase. When the detector entered into nonlinear response state, the open circle voltage （Woe） signal decreased with the laser power. The Voc signal rapidly decreased when the laser turned on and the Voc signal rapidly increased when the laser turned off. The effect of laser induced temperature field and temperature dependence built-in field of pn junction were considered. The laser power variation of laser turn on and turn off were aslo considered. The analytical model of photovoltaic detector irradiated by above-band gap CW laser was built up. The calculation results agree well with the experiment results. It is shown that the temperature dependence built-in field of pn junction is the main mechanism induced the nonlinear response. The magnitude of Voc signals with laser turn on and turn off is decided by light intensity and temperature.
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