Organic semiconductor device, method for producing organic semiconductor device, organic electroluminescent device, and method for producing organic electroluminescent device

A method for producing an organic electroluminescent device including a substrate, a cathode, an anode, and a plurality of organic layers including an organic layer having hole transport properties and an organic layer having light-emitting properties, the plurality of organic layers being disposed between the cathode and the anode, the method comprising:

• forming a film of a liquid composition on a target surface, the liquid composition being composed of a material constituting one of the plurality of the organic layers, the material being dissolved or dispersed in a first solvent, and the target surface including an anode surface and a surface of any of the other of the plurality of organic layers;
• altering a portion of the film adjacent to the target surface, the portion having a predetermined thickness, in such a manner that the portion is not dissolved in a predetermined solvent containing the first solvent;
• and
• removing an unaltered portion of the film with the predetermined solvent, the unaltered portion being not altered in the step of altering the portion.

An organic electroluminescent device comprising:

• a substrate;
• an anode disposed on a surface of the substrate;
• an insulating layer disposed on the substrate in such a manner that the anode is covered with the insulating layer, the insulating layer having a first opening superposed on the anode in a plan view, and the first opening partially exposing the anode;
• a hole transport layer disposed on the anode in such a manner that a portion having hole transport properties is located within the first opening;
• a light-emitting layer disposed on the hole transport layer;
• a bank disposed on the insulating layer and having a second opening superposed on the first opening in a plan view;
• and
• a cathode disposed in such a manner that the bank is covered with the cathode, the cathode being electrically connected to the light-emitting layer.