Photo-current characteristics in close space sublimation processed multi-facetted Cadmium Telluride (CdTe) micro-granular films were studied under AM1.5, blue and green laser illuminations to assess the energy dependent charge transport characteristics. Photo-current under AM1.5 illumination (100 mW/cm ² ) resulted in three times more than dark current while it was observed 2.4 and 2.5 times more in case of blue and green laser illuminations, respectively. While all the three illuminations (AM1.5, blue and green lasers) were capable to generate photo-electrons in CdTe, the variation in magnitude was articulated to the effect of grain boundaries present across the charge transport pathways as evidenced from the surface morphology examined by scanning electron microscopic studies which asserted that CdTe films were micro-granular in nature separated by grain boundaries. It is elucidated in the measurements that charge carriers under the illumination of AM1.5 light, acquired energy to overcome the grain boundaries easily compared to the charge carriers produced by blue and green light sources as evidenced from the photo-current measurements.

中文翻译：

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近距离升华的微颗粒CdTe薄膜中的颗粒/晶界介导的分散光电流特性

在AM1.5，蓝色和绿色激光照射下研究了近空间升华处理的多面碲化镉（CdTe）微颗粒薄膜的光电流特性，以评估能量依赖性的电荷传输特性。在AM1.5照明下的光电流（100 mW / cm ² ）产生的电流是暗电流的三倍，而在蓝色和绿色激光照射下的电流分别是暗电流的2.4倍和2.5倍。虽然所有三种照明（AM1.5，蓝色和绿色激光）均能够在CdTe中产生光电子，但其大小变化却清楚地反映了整个电荷传输路径中存在的晶界的影响，这从所检查的表面形态可以证明通过扫描电子显微镜研究，该研究断言CdTe膜本质上是微颗粒的，被晶界隔开。在测量中阐明，与光电流测量所证明的蓝色和绿色光源产生的电荷载流子相比，在AM1.5光的照射下电荷载流子获得的能量容易克服晶界，与蓝光和绿色光源产生的电荷载流子相比。