Method of selectively transferring semiconductor device

1. A method of transferring semiconductor devices from a first substrate to a second substrate, comprising:

providing the semiconductor devices which are between the first substrate and the second substrate, wherein the semiconductor devices comprises a first semiconductor device and a second semiconductor device, and the first semiconductor device and the second semiconductor device have a first gap between thereof;

providing a picking unit for picking the first semiconductor device and the second semiconductor device from the first substrate;

separating the first semiconductor device and the second semiconductor device from the first substrate;

moving the picking unit and the second substrate relatively to the each other while maintaining a space between the picking unit and the second substrate; and

sticking the first semiconductor device and the second semiconductor device to a surface of the second substrate, wherein the first semiconductor device and the second semiconductor device have a second gap between thereof;

wherein the first gap and the second gap are different.

2. The method according to claim 1 , wherein a difference between the first gap and the second gap is smaller than 10 μm.

3. The method according to claim 2 , wherein the difference between the first gap and the second gap is larger than 1 nm.

4. The method according to claim 1 , wherein the first semiconductor device and the second semiconductor device are separated from the first substrate at the same time.

5. The method according to claim 1 , wherein the first semiconductor device and the second semiconductor device are separated from the first substrate in sequence.

6. The method according to claim 1 , further comprising moving the first substrate following said moving the picking unit and second substrate.

7. The method according to claim 1 , wherein the picking unit provides a magnetic force for attracting the first semiconductor device and the second semiconductor device.

8. The method according to claim 1 , wherein each of the first and second semiconductor devices comprises a magnetism layer.

9. The method according to claim 8 , wherein the magnetism layer comprises paramagnetic material.

10. The method according to claim 1 , wherein the picking unit directly contacts the first semiconductor device and the second semiconductor device after separating the first semiconductor device and the second semiconductor device from the first substrate.

11. The method according to claim 1 , wherein the second substrate is between the picking unit and the semiconductor devices.

12. The method according to claim 7 , further comprising a plurality of terminals are on the surface of the second substrate.

13. The method according to claim 12 , wherein the plurality of terminals comprise paramagnetic material.

14. The method according to claim 7 , further comprising a sacrificial layer is-between the first semiconductor device and the first substrate.

15. The method according to claim 14 , further comprising a release layer between the first semiconductor device and the first substrate.

16. The method according to claim 14 , further comprising removing the sacrificial layer.

17. The method according to claim 15 , wherein an adhesive strength between the release layer and the first semiconductor device is smaller than the magnetic force.

18. The method according to claim 7 , wherein the picking unit comprises an electromagnet circuit for providing the magnetic force.