Study of Energy Band-Gap and Diffusion Potential of P.N. Junction - BRAND - VIJAYANTA, INDIA 1. Study of Energy Band-Gap and Diffusion Potential of P.N. Junction, Model: PN 01 Complete in all respect, including 7 Power Supplies, a 3�½ Digit DPM for the measurement of bias/junction voltage, temperature Controlled oven, another 3½ digit DPM for junction current/Temperature measurements and two diode/transistor as samples with Teflon holders.