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

Publication Type : Journal Article

Thematic Areas : Nanosciences and Molecular Medicine

Publisher : IET Optoelectronics

Source : IET Optoelectronics, Volume 14, Number 5, p.252-255 (2020)

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

Campus : Amritapuri

School : Center for Nanosciences, School of Engineering

Center : Amrita Center for Nanosciences and Molecular Medicine Move

Department : Nanosciences

Year : 2020

Abstract : 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/cm2) 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.

Cite this Research Publication : K. Velu Ramanathan, Shankar, B., Shantikumar V Nair, and Dr. Mariyappan Shanmugam, “Grain/grain-boundary mediated dispersive photo-current characteristics in close space sublimated micro-granular CdTe films”, IET Optoelectronics, vol. 14, pp. 252-255, 2020.

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