Problem with OnTriggerEnter

need help guys,, make explosion script, but it not work. i want, when player touch cube with collider as a Trigger then the Cube explode and player thrown, this my script :

     void OnTriggerEnter (Collision col)
     {
         ExplosionWork (col.contacts [0].point);
         // please help me to change this to "Void OnTriggerEnter"
     }

     public void ExplosionWork(Vector3 explosionPoint)
     {
         hitColliders = Physics.OverlapSphere (explosionPoint, blastRadius, explosionLayers);
         foreach (Collider hitCol in hitColliders) 
         {
             if(hitCol.GetComponent<Rigidbody>())
             {
                 hitCol.GetComponent<Rigidbody>().isKinematic = false;
                 hitCol.GetComponent<Rigidbody>().AddExplosionForce(explosionPower, explosionPoint, blastRadius, 0, ForceMode.Impulse);
             }
         }
     }

Thanks, Have a nice day