4.1 Article

Grain/grain-boundary mediated dispersive photo-current characteristics in close space sublimated micro-granular CdTe films

Journal

IET OPTOELECTRONICS
Volume 14, Issue 5, Pages 252-255

Publisher

INST ENGINEERING TECHNOLOGY-IET
DOI: 10.1049/iet-opt.2019.0142

Keywords

sublimation; scanning electron microscopy; cadmium compounds; semiconductor thin films; II-VI semiconductors; photoconductivity; surface morphology; grain boundaries; granular materials; blue laser illuminations; green laser illuminations; energy dependent charge transport characteristics; photoelectron generation; grain-boundary mediated dispersive photocurrent characteristics; charge transport pathways; charge carriers; scanning electron microscopy; blue light sources; green light sources; photocurrent measurements; close space sublimated microgranular CdTe films; multifacetted cadmium telluride microgranular films; AM1; 5 light illumination; surface morphology; CdTe

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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.

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