红外与毫米波学报, 2009, 28 (3): 161, 网络出版: 2010-12-13   

皮秒脉冲激光照射下碲镉汞光伏红外探测器的负光伏响应新现象

NEGATIVE PHOTOVOLTAIC-RESPONSES IN HgCdTe INFRARED PHOTOVOLTAIC DETECTORS IRRADIATED WITH PICOSECOND PULSED LASER
作者单位
1 中科院上海技术物理研究所 红外物理国家重点实验室,上海 200083
2 上海电力学院 计算机与信息工程学院,上海 200090
摘要
利用皮秒脉冲激光激发碲镉汞线列探测器上的光敏元,发现光伏响应表现为在最初大约15 ns范围内首先形 成一个明显的负光生电压的响应谷,之后才演变为正的光伏响应峰.改变入射激光脉冲的光子能量发现,无论是光 子能量大于禁带宽度的单光子吸收跃迁还是小于禁带宽度的双光子吸收跃迁,器件的光伏响应随时间的演变均表 现出类似的规律.用光阑对探测器的受光面积进行限制将使负的光生电压减弱并接近消失.结合探测器线列的电 极分布构形,将负光伏响应指认为p-电极的肖特基接触所致.利用该方法有可能对p-电极是否形成欧姆接触进行 判定,其灵敏度应远高于常规的电学测量方法.
Abstract
A transient negative photovoltaic-response behavior was reported in a pixel of the linear array of HgCdTe infrared photovoltaic detectors. When irradiated with a picosecond pulsed laser, the time profile of the responding voltage shows an apparent negative valley during the first 15 ns, then it evolves a positive peak. By changing the excitation laser energy, the transient photo-responses of the detectors show the similar time evolution profiles, no matter for the case of single photon absorption transition that the photon energy is larger than the bandgap or for the case of two photon absorption transition that the photon energy is smaller than the bandgap. Blocking the laser beam with an aperture to limit the irradiation area makes the negative photovoltage decrease and even disappear. By considering the p-electrode configuration in the linear array of the detectors, the negative photovoltaic-response has been attributed to the Schottky contact behavior of the p-electrode. Such a new phenomenon could be used in characterizing the Ohmic contact of the p-electrode in this kind of photodetectors, and its sensitivity is expected to be much higher than that of the conventional I-V measurements.

崔昊杨, 李志锋, 马法君, 胡晓宁, 叶振华, 陆卫. 皮秒脉冲激光照射下碲镉汞光伏红外探测器的负光伏响应新现象[J]. 红外与毫米波学报, 2009, 28(3): 161. CUI Hao-Yang, LI Zhi-Feng, MA Fa-Jun, HU Xiao-Ning, YE Zhen-Hua, LU Wei. NEGATIVE PHOTOVOLTAIC-RESPONSES IN HgCdTe INFRARED PHOTOVOLTAIC DETECTORS IRRADIATED WITH PICOSECOND PULSED LASER[J]. Journal of Infrared and Millimeter Waves, 2009, 28(3): 161.

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