Diffusion current in a circuit containing semiconductor but no electric source

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Diffusion current can occur in N-type or P-type semiconductors due to the movement of charge carriers from regions of high concentration to low concentration, even without an external electric source. This current is typically transient and most noticeable during the formation of a p-n junction. When a circuit is connected to a battery, both drift and diffusion currents can coexist, with drift current resulting from the electric field established by the battery. The diffusion current will still be present but may be overshadowed by the stronger drift current. Understanding these currents is essential for analyzing semiconductor behavior in various applications.
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Please I need help to understand how diffusion current can occur in a circuit that contains an N-type or P-type semiconductor without being connected to an electric souce such as a battery.And how can both drift and diffusion current occur when the circuit is connected to a battery?
 
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Diffusion current will be a transient at the time of making of a p-n junction. You won't be able to measure it then.
 
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