Dear Jamil Ahmed Buledi ,the peak sharpness depends on the reversibility of the investigated redox reaction. The less reversible the reaction is, the broader the voltammogram gets. Since most of the organic compounds have either quasi-reversible or irreversible electrode reactions, their corresponding voltammograms are usually broader compared to that of metal ions which are mostly reversible. This rule is applicable to DPV, CV and LSV systems. In each technique the current can be limited by the kinetic polarization and engender broader signals. Attached you can find some examples of three reversible, quas-ireversible, and irreversible CV signals.

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Dear Mahdi Ghamsari thank you so much for your valuable answer

hello, Jamil Ahmed Buledi

I recommend your answer Mahdi Ghamsari

voltammetry is based on the redox-reaction. For metals the redox reactions very prominent but the organic molecules show quasi-reversible/irreversible reactions (electrode reactions). That is why the voltammetry profile has sharp nature for metal ions.