Method for forming light-transmitting regions

A method for forming an image sensing device, comprising:

• providing an image sensing structure with a microlens, wherein the microlens is formed with a curved portion;
• forming a sacrificial layer over a portion of the curved portion of the microlens, wherein the sacrificial layer comprises an energy-induced swelling material;
• conformably forming a light-blocking layer over the image sensing structure, covering the sacrificial layer and the microlens;
• subjecting the image sensing structure, the sacrificial layer, and the light-blocking layer to an energy source to swell the sacrificial layer until bursting, thereby delaminating a portion of the light-blocking layer from the microlens and leaving a light-transmitting region in the light-blocking layer, thereby defining a diaphragm for the microlens;
• providing a gas flow or scrub cleaning force to clean up the diaphragm and a top surface of the light-blocking layer remaining over the image sensing structure;
• and
• disposing a planar substrate over the image sensing structure with the diaphragm for the microlens formed thereon, wherein the planar substrate is transparent to light.

A method for forming an image sensing device, comprising:

• providing a planar substrate, wherein the planar substrate is transparent to light;
• forming a sacrificial layer over a portion of the planar substrate, wherein the sacrificial layer comprises an energy-induced swelling material;
• conformably forming a light-blocking layer over the planar substrate, covering the sacrificial layer and the planar substrate;
• subjecting the planar substrate, the sacrificial layer, and the light-blocking layer to an energy source to swell the sacrificial layer until bursting, thereby delaminating a portion of the light-blocking layer from the planar substrate and leaving a light-transmitting region in the light-blocking layer, wherein the light-transmitting region exposes a portion of the planar substrate;
• providing a gas flow or scrub cleaning force to clean up the light-transmitting region and a top surface of the light-blocking layer remaining over the transparent substrate;
• and
• disposing the planar substrate with a light-transmitting region in the light-blocking layer formed thereon over an image sensing structure with a microlens and the light-transmitting region defined as a diaphragm for the microlens.