Chemical Etching in Semiconductor ManufacturingShenzhen Zhuolida

Semiconductor manufacturing relies on multiple subtractive processing technologies to create microscale structures for chip packaging, testing and peripheral hardware. While waferlevel dry plasma etching dominates silicon circuit patterning, chemical (photochemical) etching plays an irreplaceable role in manufacturing highprecision thinmetal components used throughout semiconductor packaging, probe testing, EMI shielding and thermal management. Shenzhen Zhuolida is an experienced manufacturer specialising in chemical etching of semiconductorgrade metal thin sheets, delivering dimensionstable, burrfree microparts for global semiconductor, IC packaging and microelectronics customers. Without mouldtooling constraints, our photochemical etching process supports rapid prototyping and highvolume mass production for complex semiconductor metal components.

1. Position of Chemical Etching within Semiconductor Industry

It is important to distinguish between waferlevel etching and componentlevel chemical etching. Wafer fabrication mainly uses dry plasma etching and electronicgrade wetchemical etching to pattern silicon, dielectric and thinfilm layers on silicon wafers. Componentlevel chemical etching, the core service from Shenzhen Zhuolida, processes copper alloy, nickel, stainless steel and kovar thin sheets to produce finished metal hardware for downstream semiconductor assembly and test.

Typical semiconductorrelated metal parts made by chemical etching include semiconductor lead frames, probe contact sheets for wafer testing, EMI shielding frames, microspring contacts, heatdissipation structures, precision apertures and mask support components. These parts demand ultrafine feature control, flatness, burrfree surfaces and consistent batchtobatch performance. Traditional stamping often introduces mechanical stress, burrs and high upfront mould costs, which become bottlenecks for ultrathin, highdensity microstructures. Chemical etching avoids mechanical contact during processing, minimising material deformation and residual stress, making it wellsuited for semiconductorgrade thinmetal components深圳市卓力....

2. Core Process Flow for SemiconductorOriented Chemical Etching at Shenzhen Zhuolida

We implement fullprocess inhouse manufacturing, strictly controlling every step to satisfy semiconductorindustry cleanliness and dimensionaltolerance requirements. Our complete workflow is shown below.

Step 1: DFM Review and Material Preparation According to customer CAD data, our engineering team performs DFM analysis, calculating undercut compensation, minimum line width, aperture ratio and material thickness constraints. We select semiconductorqualified raw materials such as copperiron alloys, coppernickelsilicon alloys, kovar, nickel and lowcarbon stainless steel. Material thickness ranges from 0.02 mm to 0.5 mm, which covers most packaging and testfixture component requirements.

Step 2: Precision Surface Pretreatment Surface quality directly impacts photoresist adhesion and final yield. Workpieces go through alkaline degreasing, acid pickling and activation to fully remove rolling oil, oxidation layers and surface contaminants. This step prevents photoresist delamination, pattern distortion and opencircuit defects on fineline structures.

Step 3: Photoresist Lamination and Highprecision Exposure Dryfilm photoresist is uniformly laminated onto cleaned metal sheets. Using highresolution UV exposure equipment, circuit patterns are transferred onto photoresist with highpositioning accuracy. This defines the protective mask that shields nonetching regions.

Step 4: Developing Alkaline developer dissolves exposed photoresist, precisely exposing metal zones to be etched. Visual and AOI inspection is carried out to verify pattern integrity before entering the etching bath.

Step 5: Controlled Chemical Etching Parts enter automatic circulating etching lines. Etchant temperature, spray pressure, concentration and conveying speed are digitally monitored and stabilised. We precisely control vertical etching depth and lateral undercut to achieve consistent critical dimensions. For semiconductor leadframe products, tight control of sidewall profile ensures good subsequent plating and wirebonding performance.

Step 6: Stripping and Posttreatment After etching completion, photoresist mask is completely stripped. Components go through multistage rinsing, neutralisation and drying. Optional secondary processes include deburring, surface passivation, plating (nickel, gold), forming and electricalperformance testing according to semiconductorproject specifications.

Step 7: Multidimensional Quality Inspection Finished parts undergo AOI optical inspection, dimensional measurement by microscope, flatness testing and surfacedefect screening. We provide inspection reports upon request for semiconductorcustomer incomingquality control. Batchtobatch dimensional consistency is strictly maintained for highvolume packaging production.

3. Main SemiconductorRelated Product Portfolio from Shenzhen Zhuolida

1. Semiconductor Lead Frames: Highdensity copperalloy lead frames for IC packaging, supporting finepitch structures. No mould charges, fast sample turnaround. Suitable for SOP, QFN, BGArelated packaging applications深圳市卓力....

2. WaferTest Probe Contact Sheets: Microprecision contact sheets used in probe cards and wafertest sockets, featuring dense microapertures and microspring structures. Low residual stress ensures stable electrical contact during repeated testing cycles.

3. EMI Shielding Components: Ultrathin shielding frames and covers for semiconductor modules, power IC and SiP systeminpackage devices.

4. Thermal Management Microstructures: Microchannel heat spreaders and pinfin array parts for power semiconductors such as IGBT and MOSFET modules.

5. Precision Apertures & Mask Frames: Microperforated metal sheets and supporting frames used for optical alignment, lightbarrier and particlefiltering inside semiconductorprocessing equipment.

4. Key Advantages for SemiconductorIndustry Customers

1. Stable microprecision performance: Tolerance can reach ±0.01 mm for qualified material thickness. Finepitch leadframe and denseaperture structures can be massproduced without burrs and deformation, satisfying highreliability requirements for IC packaging and testing.

2. Zeromouldtool manufacturing: New product sampling cycle is greatly shortened. Design modification only requires updating CAD files, avoiding expensive stampingmould rework. It fits well with semiconductor customers’ frequent iteration of new chip projects.

3. Lowstress processing: Chemical etching is nonmechanical subtractive processing. Components retain excellent flatness after etching, avoiding springback deformation common in stamping, which is critical for subsequent plating and wirebonding processes.

4. Flexible material compatibility: We support copperbased packaging alloys, kovar, nickel and stainlesssteel series, matching different thermalexpansion and conductivity requirements of semiconductor assemblies.

5. Capability from prototype to mass volume: Support smallbatch sampling for R&D verification, while automated production lines guarantee stable largebatch delivery for packaginghouse serial production. Strict qualitycontrol documentation supports semiconductorcustomer audit requirements.

5. Technical Challenges and Process Control Points

Semiconductor metal components raise higher requirements for chemicaletching process control. Excessive undercut will degrade finepitch leadframe geometry; surface residue or microburrs may cause poor plating and electricalcontact failure. At Shenzhen Zhuolida, we manage these risks through DFM preevaluation, closedloop etchantparameter control, realtime bathcondition monitoring and fullrange AOI visual inspection. For ultrafine feature products, we narrow the etchingprocess window to minimise undercut and improve pattern fidelity.

Conclusion

Chemical etching occupies an irreplaceable position in semiconductor manufacturing, especially for custom thinmetal components for IC packaging, wafer testing and semiconductor equipment hardware. As a professional chemicaletching supplier, Shenzhen Zhuolida combines mature photochemicaletching technology, automated production lines and strict semiconductororiented quality management, providing reliable lead frames, test contact components, shielding parts and thermalmanagement microstructures for global semiconductor customers. If you have projects requiring highprecision thinmetal semiconductorrelated components, please contact Shenzhen Zhuolida for DFM evaluation and quotation.