Organic single crystal composite oriented polymer membrane, preparation method therefor, optoelectronic device and application thereof

A preparation method for oriented polymer membrane, comprising steps of:

• A1:
• first preparing an organic polymer solution:
• dissolving an organic polymer in an organic solvent;
• A2:
• a spatial confinement and directional crystallization method:
• placing the substrate on a temperature gradient hot stage, wherein a temperature of an initial position of the substrate on the temperature gradient hot stage is between a melting point and a boiling point of the organic solvent;
• dropping the organic polymer solution on the substrate, and covering a preheated sheet-like member on solution droplets;
• before moving the substrate, bringing an item pre-cooled at a low temperature into contact with a surface of the sheet-like member on the side close to a low temperature zone of the temperature gradient hot stage so that a gradient of decreasing temperature is formed in a vertical direction from the substrate to the sheet-like member, nucleating and growing the organic solvent in a liquid membrane on a surface of the sheet-like member under low temperature induction, and removing the item pre-cooled at the low temperature once nucleation of the organic solvent is observed;
• and
• moving the substrate on the temperature gradient hot stage to a temperature area lower than the initial position while controlling a speed of moving the substrate,
• wherein the low temperature refers to a temperature at least 80° C. lower than the melting point of the organic solvent.