Multispectral analysis of photosensitive perovskite-E7 liquid crystal composites: Correlating optical response with electrical properties
Source abstract
Abstract
This study investigates the photoresponsive electrical and dielectric characteristics of CH3NH3PbI3-xClx perovskite precursor ink-doped nematic liquid crystal (E7) composite under variable illumination intensities (0-100 mW/cm2). Through comprehensive electrochemical impedance spectroscopy analysis, we observed significant light-dependent modulation of charge transport mechanisms. Electrochemical impedance spectroscopy measurements revealed a 27-fold enhancement in current density under 100 mW/cm2 illumination compared to dark conditions. Complex impedance analysis demonstrated systematic reduction in charge transfer resistance with increasing light intensity, while dielectric studies revealed distinct relaxation processes in low and highfrequency regions. The composite exhibited dual relaxation times (tau 1, tau 2) that decreased from 430 to 90 s at first relaxation region (tau 1), and reaching maximum values from 8x10-4 s to 2.5 x 10-3 s at second relaxation region (tau 2) significantly with increasing illumination. AC conductivity analysis revealed four distinct conduction regions with varying frequency dependencies, suggesting multiple charge transport mechanisms. These findings demonstrate the potential of perovskite-liquid crystal composites for optoelectronic applications requiring tunable electrical and dielectric properties.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Perovskite Materials and Applications · Conducting polymers and applications · Solid-state spectroscopy and crystallography
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