How to rotate the object when you move to always look at the same point

I have a Paddle that rotates following the shape of the circle, the problem is that I need the concave part of the Paddle to face the center, that is, rotate its Y axis from 0 to 180 to look at the center.

the code to move following the circle

     float timecounter = 0;
     public Transform target;
     public float speed = 3.0f;
     public float width = 100.0f;
     public float height = 100.0f;

     // Use this for initialization
     void Start()
     {
     }
     // Update is called once per frame
     void Update()
     {
         // movimiento circular
         timecounter += Time.deltaTime * speed;
         float x = Mathf.Cos(timecounter) * width;
         float y = 3;
         float z = Mathf.Sin(timecounter) * height;
         transform.position = new Vector3(x, y, z);
 
     }
 }

i try transform.LookAt and the Quaternion.LookRotation but i can't make it work

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