Organic vapor jet printing system
Implementations of the disclosed subject matter provide an organic vapor jet print die including a linear array of depositors, with each of the depositors having a cluster of apertures. The organic vapor jet print die may include at least one first aperture in each cluster of apertures is a delivery aperture that is in fluid communication with a carrier gas source and an evaporation oven. At least one second aperture in each cluster of apertures may be an exhaust aperture in fluid communication with a vacuum reservoir with a static pressure lower than that at the apertures. The delivery apertures and exhaust apertures may have a uniformity that is less than 0.4%.
1 . An apparatus comprising:
an organic vapor jet print die including a linear array of depositors, with each of the depositors having a cluster of apertures, the organic vapor jet print die comprising:
at least one first aperture in each cluster of apertures is a delivery aperture that is in fluid communication with a carrier gas source and an evaporation oven; and
at least one second aperture in each cluster of apertures is an exhaust aperture in fluid communication with a vacuum reservoir with a static pressure lower than that at the apertures, wherein the delivery aperture and the exhaust aperture have a length nonuniformity that is less than 0.4%,
wherein the delivery aperture and the exhaust aperture are formed from bonded silicon wafers and a bisection of channels etched into the face of a silicon wafer including a buried oxide layer, and
wherein the channels that form at least one from the group consisting of: the delivery aperture and the exhaust aperture extend completely through one of a silicon layer of a wafer with a buried oxide layer and do not extend into the silicon layer on the other side of the buried oxide layer of that wafer.
2 . The apparatus of claim 1 , wherein the etched delivery aperture stops at a surface of the buried oxide layer.
3 . The apparatus of claim 1 , wherein the buried oxide layer is configured to form one side of at least one from the group consisting of: the delivery aperture, and the exhaust aperture.
4 . The apparatus of claim 1 , wherein the buried oxide layer is disposed within a middle wafer of a three-wafer stack.
5 . The apparatus of claim 1 , wherein the buried oxide layer is disposed within each wafer of a two-wafer stack.
6 . The apparatus of claim 5 , wherein the buried oxide layer is patterned.
7 . The apparatus of claim 5 , wherein etched cavities positioned adjacent to the buried oxide layer are disposed on sides of each wafer that are bonded together of the two-wafer stack.
8 . The apparatus of claim 1 , wherein the bonded silicon wafers include a first silicon wafer a second silicon wafer, and a third silicon wafer, the apparatus further comprising:
delivery channels that are coupled to the delivery apertures, and exhaust channels that are coupled to the exhaust apertures, wherein the delivery channels and the exhaust channels terminate at the buried oxidized layer of the first silicon wafer, wherein the second silicon wafer and the third silicon wafer have channels that match the exhaust channels of the first silicon wafer.
9 . The apparatus of claim 1 , wherein the buried oxide layers of the bonded silicon wafers are patterned.
10 . The apparatus of claim 1 , wherein the exhaust aperture is longer than the delivery aperture.
11 . The apparatus of claim 1 , further comprising:
delivery channels that are coupled to the delivery apertures;
delivery channel extensions that are parallel to a first axis and are coupled to the delivery channels,
wherein the delivery channels are disposed a direction that is parallel to a second axis.
12 . The apparatus of claim 1 , further comprising:
exhaust channels that are coupled to the exhaust apertures;
exhaust extensions for the exhaust channels that are parallel to a first axis, wherein the exhaust channels are parallel to a second axis.
13 . The apparatus of claim 1 , further comprising:
delivery channels having a first portion and a second portion that are coupled to the delivery apertures, wherein the first portion and the second portion bifurcate the delivery channels.
14 . The apparatus of claim 1 , further comprising:
a delivery channel coupled to the delivery aperture;
an exhaust channel coupled to the exhaust aperture,
wherein a length of the exhaust channel is defined by an etch stop of the buried oxide layer, and
a length of the delivery channel is based on a timed etch.
15 . The apparatus of claim 1 , further comprising:
a first surface of a first silicon wafer of a first wafer pair of the bonded silicon wafers, wherein the first surface has an open exhaust channel coupled to the exhaust aperture in the first wafer pair; and
a second wafer is bonded to the first wafer pair to form a print die with the bonded silicon wafers, wherein the second wafer pair is the same the first wafer pair.