High Thermal Conductivity CVD Single Crystal Diamond Heat Spreader with Gold Plating for Laser Diode

Product Description

 

 High Thermal Conductivity CVD Single Crystal Diamond Heat Spreader with Gold Plating for Laser Diode
 

• Thermal Conductivity: ≥1500 W/m·K 

• Surface Roughness: Ra < 1 nm

• Gold Layer Thickness: 0.5-3 μm 

• Bonding Layer: Titanium (Ti) adhesion layer

1. Overview

Depositing a thin film of gold (Au) on the surface of Chemical Vapor Deposition (CVD) single-crystal diamond is a critical process for material functionalization and device integration. While diamond possesses extreme physical and chemical properties (e.g., supreme hardness, highest thermal conductivity, wide bandgap, biocompatibility), the gold coating provides excellent electrical, thermal, and optical interfacial characteristics.

2. Primary Objectives and Functions

• Electrical Contact: To fabricate low-resistance, stable ohmic or Schottky contact electrodes for diamond-based electronic devices (e.g., detectors, diodes, transistors). Gold's high electrical conductivity and chemical inertness make it an ideal choice.

• Thermal Management: To serve as an efficient thermal interface material. Combining diamond's supreme bulk thermal conductivity with gold's high in-plane conductivity significantly reduces the interfacial thermal resistance between devices and heat sinks, crucial for high-power lasers, RF devices, etc.

• Optical Functionalization: To act as a high-performance reflective or filter coating, especially for optical windows, laser mirrors, and biochemical sensors utilizing surface plasmon resonance (SPR) effects in the IR to UV spectrum.

• Chemical Protection & Bonding: To protect the diamond surface from high-temperature oxidation or chemical corrosion. Additionally, the gold layer facilitates high-reliability packaging integration via soldering or eutectic bonding (e.g., Au-Sn).

• Quantum Technology: In diamond quantum devices based on nitrogen-vacancy (NV) centers, patterned gold structures function as microwave antennas or electrodes for precise manipulation and readout of electron spin states.

3. Typical Process Steps

Due to the high chemical inertness of diamond, direct gold deposition results in poor adhesion. A multi-layer metallization scheme is typically employed:

1. Surface Pretreatment: Cleaning and activating the diamond surface via acid cleaning, oxygen plasma treatment, etc.

2. Adhesion Layer Deposition: First, a very thin (~10-50 nm) layer of reactive metal, such as Titanium (Ti) or Chromium (Cr), is sputtered or evaporated. These metals form strong chemical bonds with carbon atoms on the diamond surface, providing anchoring.

3. Gold Layer Deposition: The main gold layer of desired thickness (tens of nm to several μm) is deposited atop the adhesion layer. Common methods include electron-beam evaporation, magnetron sputtering, or electroplating.

4. Patterning (Optional): Photolithography and etching techniques are used to pattern the continuous metal film into specific electrode or circuit geometries.

5. Annealing (Optional): A low-temperature anneal in an inert atmosphere may be performed to improve the contact properties at the metal-diamond interface and reduce contact resistance.

4. Key Challenges

• Adhesion: Ensuring the Ti/Au or Cr/Au multilayer structure does not delaminate under thermal cycling or mechanical stress is paramount. Control of interfacial reactions and roughness is critical.

• High-Temperature Stability: Gold tends to diffuse into other layers at elevated temperatures, potentially compromising long-term device reliability. A diffusion barrier layer (e.g., Pt, Ni) is sometimes needed.

• Interfacial Resistance: For electronic devices, optimizing the barrier height and contact resistance between the metal and doped diamond is key to performance.

• Cost: Gold is a precious metal, necessitating a balance between performance and cost, often achieved through selective deposition on critical areas.

5. Application Areas

• High-Power/High-Frequency Electronics: Heat spreaders and gate/drain electrodes for diamond-based GaN power amplifiers.

• Particle & Radiation Detectors: Signal collection electrodes for X-ray, UV, and charged particle detectors.

• Bio/Chemical Sensors: SPR sensor chips for highly sensitive detection of molecular interactions.

• Quantum Information & Sensing: Microwave resonator structures in NV-center-based magnetometers and gyroscopes.

• Aerospace Optical Windows: Ultra-durable, high-reflectivity protective coatings.

MONO/SINGLE CRYSTALLINE

 
Size:- 1X 1 mm to 8 X 8 mm,10-12mm
Thickness:- 0.3mm to 3mm
 
Grade and application
 

• Industry (for Mechanical applications, Making Wheel Dresser,die Blank,etc.)
• Electronic (for Quantum optics, radiation detector, etc.)
• Optical(for precision tools, window, anvil, sensor, etc.)
• Thermal/Mechanical (for conventional tools)

Surface

• As Grown or Laser Cut
• Polished (Ra< 1nm, Flatness < 1 fringes @ 633nm)
• Lapped (Ra< 200nm, Flatness < 1 fringes @ 633nm)

Type/Orientation

• Top (100), Customized for Scalpels (based on 2 and 4 point configuration)
• Customized shapes (based on given designs)

Edges

• Laser cut and  both polished 

Size of CVD diamond plates: 

1*1*1mm , 2*2*1mm , 3*3*1mm , 4*4*1mm , 5*5*1mm , 6*6*1mm,
7*7*1mm , 8*8*1mm ,9*9*1mm ,10*10*1mm ,11*11*1mm ,12*12*1mm
 

Thickness of diamond plates:from 0.1mm to 3mm 
Customized shape and size are available!
 
Application
a, cutting tools for non-ferrous and non-metallic materials.
b, dressers for wheel dressing
c, a variety of speciallity knives
d,  burnishing tools, cutting tools
e, wear parts
f, wire drawing dies
g, optical window




 

HPHT DIAMOND PLATE:

1,Size of diamond plates: 

2.0x2.0 x1.1mm, 2.5x2.5x1.1mm, 3.0x3.0x1.1mm, 3.5x3.5x1.1mm,

4.0x4.0x1.1mm, 4.5x4.5x1.1mm, 5.0x5.0x1.1mm, 5.5x5.5x1.1mm etc

Thickness of diamond plates:from 1.1mm to 1.7mm 

Shape of diamond plates: Round shape, Square shape, rectangle,hexangle shapes etc
 

Customized shape and size are available!

 

Application

a, cutting tools for non-ferrous and non-metallic materials.
b, dressers for wheel dressing

c, a variety of speciallity knives

d,  burnishing tools

e, wear parts

f, wire drawing dies

g, seeds for cvd diamond
 

Advantages: 

1, produced by HPHT or CVD
2, high quality as natural diamond, hardness is Moh's 10, can pass diamond test pen.
3, white or yellow color, good transparency, high strengh, low impurity
4, different shape(round, square, cube), size and thickness(1.1mm to 1.7mm) are available.

2. Features for mono-crystal synthetic diamonds for sale
1. Regular and irregular square shape
2. High hardness and stength, great thermal stability
3. High impact resistance
4. Good diaphaneity

How to choose synthetic diamonds?

All available sizes of industrial synthetic  diamonds and their applications below.

1.Sythetic diamond grit :

16/18(D1180),18/20 (D1001),20/25 (D851),25/30 (D711),30/35 (D601),35/40 (D501)
40/45 (D425), 45/50 (D356), 50/60 (D301), 60/70 (D251),70/80 (D213), 80/100 (D181)
100/120 (D151),120/140 (D126),140/170 (D107),170/200 (D91),200/230 (D76)
230/270 (D64),270/325 (D54), 325/400 (D46) 

 

2. Large size synthetic diamond for tools, jewellery

crystals : 1mm to 5mm 

plates:  2.0 x 2.0 x 1.0mm,  2.5x2.5x1.0mm, 3.0x3.0x1.0mm, 3.5x3.5x1.0mm, 4.0x4.0x1.0mm, 4.5x4.5x1.0mm, 5.0x5.0x1.0mm, 5.5x5.5x1.0mm   
Different shapes (Round shape, Square shape, rectangle,sexangle shapes ) are available. 
 

3.RVD diamond crushing material:  

100/120 230/270
120/140 270/325
140/170 325/400
170/200 400/500
200/230 500/600  

 

4.Diamond micro powder: 

For polishing: 0-0.5,0-1,0.5-1,0.5-1.5,0-2, 1-2,1-3,2-4,2.5-5,3-6
For Lapping   ; 4-8, 5-10,6-12,8-16,10-20
For Grinding  : 12-22, 20-30,22-36, 36-54 

How to place order to us?

1.Please let me know what are the synthetic diamond used for? the most suitable size and grade diamond will recommend to you.

2.We provide small sample for your test.

3.If sample test succeed please inform us to arrange your needed goods.

4.Usually our synthetic diamond delivered by Express or air transport. If you have special requirement please let us know.

5.Delivery time usually 5-7 days after confirmation of deposit.

 

Application

 

Synthetic diamonds have a wide range of using methods, such like Saws , dressing tools, drilling tools,  electroplated tools, scraping tools, metal bond abrasive wheels, stone/ceramics/glass processing tools, mechanical pressing industry etc

If you have any needs of diamond or diamond correlates please do feel free to contact me for more details of the product you are interested in.