Comparative Study: The Effect of Helium Neon Laser Irradiation on the Electrical Conductivity of Zener Diodes and Light Emitting Diodes (LEDs)

This research presents a comparative analysis of the optoelectronic response of Zener diodes and Light Emitting Diodes (LEDs) under laser irradiation. The study investigates changes in the current-voltage (I−V)characteristics, conductivity, and threshold voltages. The results indicate that laser exposure significantly enhances carrier density, causing a reduction in the Zener breakdown voltage (VZ) for Zener diodes and a shift in the turn-on voltage (𝑉𝑡ℎ) for LEDs, with the latter showing high dependency on wavelength matching. The results indicate that laser-induced carrier generation significantly enhances conductivity, though the magnitude varies between the two components. Zener diodes exhibited a higher sensitivity in their reverse-bias stability, while LEDs showed notable shifts in their forward-bias knee voltage.