The photoresist homogenizer (also known as spin coating machine) is a key equipment in semiconductor manufacturing, micro nano processing, and optoelectronic device preparation. Its core function is to form a uniformly thick and defect free photoresist film on the substrate surface. The following is a deep analysis of its typical application cases and technical details:

1. High precision graphing in semiconductor manufacturing

(1)Integrated Circuit（IC）Manufacturing

Application scenario: photoresist spin coating on silicon wafers（150-300mmWafer)

Process parameters:

Speed:500-6000 rpmAdjust according to the adhesive thickness requirements, such asi-lineGlue thickness1μmneed3000rpm）

Acceleration:1000-5000 rpm/s(Prevent edge accumulation)

Uniformity of adhesive thickness:≤±1%（300mmInside the wafer

casesome12The inch wafer fab adopts dynamic speed regulation technology in the anti reflection layer（BARC）Top spin coatingArFPhotoresist, realizingCD(Key dimensions) control±0.8nmSignificantly reducedLER(Line edge roughness).

(2)Advanced packaging

TSV(Silicon via) process:

The glue homogenizer needs to have a depth to width ratio5:1Uniform coverage is achieved inside the holes, using low-pressure pre wetting technology (inserting before spraying glue)HMDSSteam enhances the wettability.

2. Preparation of Micro Nano Devices

(1) MEMSsensor

Application requirements:

Coating thick adhesive on silicon wafers or glass（SU-8，10-100μm）

High requirement for step coverage (structural height difference)>20μm）

Edge removal: Use dynamic scraper or solvent spray to eliminate edge beads（Edge Bead）.

(2)Photonic crystal processing

caseA certain research institute spin coating on quartz substrateHSQ(Hydrogen silsesquioxane) adhesive, initially spread at low speed（200rpm, 10s）+High speed fixed thickness（4000rpm, 60s）, obtain50nm±2nmThe ultra-thin adhesive layer is used to prepare wavelength selective photonic crystals.

3. New Display and Flexible Electronics

(1) OLEDdisplay panel

Large size substrate（G6Dai,1850×1500mm）：

The glue homogenizer adopts multi axis collaborative control and substrate inclination<0.01°

Air floating tray reduces mechanical stress and uneven film thickness<±1.5%

(2)flexiblePIsubstrate

Challenge:PIThe substrate has strong hydrophobicity and is prone to occurrence“Coffee ring”effect

Innovative solution:

Plasma pretreatment（O?/N?Mixed gases,100W，30s）

Low surface tension solvent formula (such as adding)0.1%Fluorine seriessurfactant）

4. Research grade special applications

(1)Electron beam lithography（EBL）

High resolution adhesive（PMMA）：

The glue spreader is equipped with an active temperature control suction cup（23±0.1℃) suppresses thermal fluctuations

100nmGlue thicknessCV(Coefficient of variation)<2%

(2)Nano imprint template

caseA certain team is4Spin coating on inch quartz templateUV-NILGlue, adsorbed by vacuum+Secondary deceleration program（6000rpm →2000rpmGradient descent, elimination of microbubbles, defect density<0.1/cm2.

5. Process fault diagnosis and solution

6. Technological development trends

(1)Intelligent upgrade

AIReal time control:passCCDMonitor the interference fringes of the adhesive film,MLAlgorithm dynamically adjusts speed (response time)<100ms）

Digital twin system:based onCOMSOLSimulate the establishment of a virtual model for the spin coating process and predict the distribution of adhesive thickness

(2)Extreme Process Expansion

Two dimensional material transfer assisted spin coating:Spin coating on graphene surfacePMMASupport layer, breaking through the limitations of traditional substrates

Asia10nmUltra thin adhesive layer:Developing low viscosity resins（the <1cP）+Ultra high speed spin coating（>10000rpm）

Conclusion

The application of photoresist homogenizer is extending from traditional semiconductors to emerging fields such as heterogeneous integration, flexible electronics, and quantum devices. The future development direction will focus on:①large size/Adaptability of irregular substrates;②ultra-thin/Expansion of process window for ultra thick adhesive layer;③The popularization of intelligent closed-loop control systems.Equipment manufacturers need to collaborate deeply with photoresist suppliers to achieve material compatibility-workmanship-Optimization of the entire chain of equipment.