Manufacturing method of a thin film transistor and pixel unit thereof

摘要

The present invention provides a method of manufacturing a thin film transistor pixel unit, comprising: forming a metal oxide layer, a gate insulating layer, a gate metal layer and an etching barrier layer on a substrate, wherein the metal oxide layer is in a thin film transistor region; through a same mask, etching a part of the etching barrier layer, the gate metal layer and the gate insulating layer on the substrate for forming a gate region, source and drain regions for forming contact vias, a gate interface region, and a storage capacitor region, respectively. Through additional steps including etching, metallizing, and filling, a source contact via is formed in the source region, a drain contact via is formed in the drain region, and a connecting contact via is formed in the gate interface region, respectively.

主权项

1. A method of manufacturing a thin film transistor pixel unit, comprising the following steps:
forming a metal oxide layer, a gate insulating layer, a gate metal layer and an etching barrier layer on a substrate, wherein the metal oxide layer is in a thin film transistor region; coating a photoresist on the etching barrier layer, and placing a same mask over the photoresist; a first etching through the same mask to remove a part of the etching barrier layer, the gate metal layer and the gate insulating layer on the substrate, and retaining the metal oxide layer, the gate insulating layer, the gate metal layer, the etching barrier layer and the photoresist tin a gate region, the metal oxide layer, the gate insulating layer, the gate metal layer and the photoresist in a source region and a drain region for forming contact vias, respectively, the gate insulating layer, the gate metal layer, the etching barrier layer and the photoresist in a gate interface region, and the gate insulating layer, the gate metal layer and the photoresist in a storage capacitor region; thinning to remove the photoresist in the source region, the drain region and the storage capacitor region; a second etching to remove the photoresist in the gate region and the gate interface region; exposing the remaining metal oxide layer in the source region, the drain region and the gate region; metallizing the exposed metal oxide layer in the source region and the drain region to form the source and the drain, and then depositing a passivation layer; etching the passivation layer in the source region and the drain region for forming contact vias, and the passivation layer in the gate interface region, thereby forming an upper part of a source contact via, a drain contact via and a connection contact via in the gate interface region; further etching the gate metal layer and the gate insulating layer in the source region and the drain region for forming contact vias, and the etching barrier layer in the gate interface region, and exposing the metal oxide layer in the source region and the drain region for forming contact vias, the gate metal layer in the gate interface region, thereby forming a lower part of the source contact via, a lower part of the drain contact via and a lower part of the connection contact via in the gate interface region, with each lower part forming the complete source contact via, drain contact via and connection contact via in the gate interface region with its corresponding upper part; metallizing the exposed metal oxide layer in the source region and the drain region, and connecting them to the formed lower parts of the source and the drain respectively to form the source and drain; and filling a conductive material in the source contact via, the drain contact via and the connection contact via in the gate interface region.