natural of diode in diode operation

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How the concentration /doping affects the nature of the diode in diode operation? 

When the amount of doping increases the thickness of depletion layer generated at the junction decreases and when the amount of doping decreases layer increases . Even if one part of PN junction is heavily doped the thickness of depletion layer on that becomes less than that of other side . If the depletion region increases then only some amount of current (as a small leakage) will be slow and diode act like an operation circuit . If the depletion region decreases when diode acts like a short circuit and it allowing full circuit current to flow. 

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