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Evaluation of Space Radiation Effects on HgCdTe Avalanche Photodiode Arrays for Lidar Applications

机译：LIDAR应用HGCDTE雪崩光电二极管阵列的空间辐射效应评价

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We report the results from proton and gamma ray radiation testing of HgCdTe avalanche photodiode (APD) arrays developed by Leonardo DRS for space lidar receivers. The devices were tested with -60 MeV protons up to 100 krad(Si) without the read-out integrated circuit (ROIC) and 30 krad(Si) with the ROIC. We also measured the transient responses with the device fully powered and the APD gain set to > 1000. The detectors output a large current impulse in response to each proton hit, which could saturate the ROIC but recovered within 1 μs. The APD dark currents increased linearly with the proton dose. The quantum efficiency and APD gain decreased slightly with dose. The dark currents due to the radiation damage went up many times after the devices were warmed to room temperature and cooled to 80K again. The radiation damage was found to completely anneal after baking the device at 85°C or higher. These results showed the HgCdTe APD arrays are suitable for use in space lidar for typical Earth orbiting and planetary missions provided that provisions are made to heat the detector chip to 85°C when the system performance is impacted.
机译：我们报告了由Leonardo Drs为Space Lidar接收器开发的HGCDTE Avalanche Photodiode（APD）阵列的质子和伽马射线辐射测试的结果。该器件用-60 mev质子测试，高达100 krad（si），没有读出集成电路（roic）和30 krad（si），带有roic。我们还通过完全供电的设备测量瞬态响应，并且APD增益设置为> 1000。探测器响应每个质子击中输出大电流脉冲，这可以使ROIC饱和但在1μs内恢复。 APD暗电流与质子剂量线性增加。量子效率和APD增益略微降低剂量。由于辐射损坏的暗电流在将器件温热至室温后升高了多次，再次冷却至80k。在85℃或更高时烘烤装置后，发现辐射损伤在烘烤装置后完全退火。这些结果表明，HGCDTE APD阵列适用于空间LIDAR以进行典型地球轨道和行星任务，只要在系统性能受到影响时，将检测器芯片加热到85°C。

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