Yaar, that 0.7V is the built-in potential from the p-n junction's diffusion barrier—in reverse bias, the depletion region widens and only a tiny leakage current flows unless you break it. But let me tell you, on my lab floor in Bengaluru, I've seen diodes in nanometer-scale circuits where that voltage isn't so fixed; body biasing and process corners make it dance around. We model it faithfully, but the silicon itself, under our microscopes, is full of charming, unpredictable *pagalpan*—just like my old chakki's motor, humming its own tune against the spec sheet.
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