Stamp with structured posts

A method of using a micro-transfer printing stamp, comprising:

• providing an array of micro-transfer printable devices formed on or in a source substrate, each micro-transfer printable device having a non-planar contact surface limited to a single side of the micro-transfer printable device opposite the source substrate;
• providing the micro-transfer printing stamp for micro-transfer printing the micro-transfer printable devices from the source substrate to a destination substrate, the micro-transfer printing stamp comprising:
• a body, and
• an array of posts extending from the body, wherein each post in the array of posts has a non-planar surface contour on the distal end of the post having at least one of a size and shape that corresponds to the non-planar contact surface of the micro-transfer printable device during micro-transfer printing, wherein the non-planar surface contour of each post is limited to the non-planar contact surface of the micro-transfer printable device;
• pressing the non-planar surface at the distal end of one of the one or more posts against the non-planar contact surface of the micro-transfer printable devices to adhere each micro-transfer printable device to the distal end of a respective post;
• removing the micro-transfer printable devices from the wafer with the micro-transfer printing stamp;
• pressing the micro-transfer printable devices to a destination substrate with the micro-transfer printing stamp to adhere the micro-transfer printable devices to the destination substrate;
• and
• removing the micro-transfer printing stamp from the micro-transfer printable devices, thereby transferring the micro-transfer printable devices to the destination substrate.

A system for micro-transfer printing, comprising:

• an array of micro-transfer printable devices formed on or in a source substrate, each micro-transfer printable device having a first side with a contact surface limited to the first side and a second side, opposite the first side, with one or more protrusions thereon;
• and
• a micro-transfer printing stamp for micro-transfer printing the micro-transfer printable devices from the source substrate to a destination substrate, the micro-transfer printing stamp comprising:
• a body,
• an array of posts extending from the body,
• wherein each post in the array of posts has a non-planar surface contour on the distal end of the post such that discrete portions of the non-planar surface contour contact the contact surface of a respective micro-transfer printable device while picking up and transferring the micro-transfer printable device to the destination substrate with the micro-transfer printing stamp, wherein the non-planar surface contour of each post is limited to the contact surface of the first side of the micro-transfer printable device.