MBE Components, Vertical Electron Beam Evaporator EBVV

EBVV

Vertical Electron Beam Evaporator

EBVV 63-4 Vertical Electron Beam Evaporator on DN63CF (O.D. 4.5") flange with 4 cm³ crucible capacity

Fully UHV compatible
Small dimensions fit onto DN63CF (O.D. 4.5'') ports
Hearth volumes 4 cm³ or 5 cm³
High purity evaporation of metals and dielectrica
Long filament lifetime and easy maintenance
270° beam deflection
High frequency x-y-beam deflection system
Silicon shielding parts for use in SiGe-MBE

The Vertical Electron Beam Evaporators EBVV allow the user to introduce real e-beam evaporation into many growth systems originally designed for radiation heated effusion cells only. Despite its small footprint, the EBVV features a complete electromagnetic x- and y-dynamic beam deflection system and is capable of delivering beam powers up to 3kW @ 6kV.

Its unique and extremely compact design makes it possible to install the EBVV instead of an ordinary effusion cell onto any MBE system having a (near) vertical DN63CF port with I.D. >= 60mm.
Inclined ports can be used without any difficulty for sublimating crucible charges. For materials that become liquid during operation EBVV evaporators are available with a tilted hearth geometry on request.

Especially for hot parts only UHV-grade materials are used without any compromise: molybdenum emitter block, tungsten filament and Al₂O₃ insulting ceramics. The main body is manufactured from OFHC (Oxygen-Free High Conductivity) copper and closely surrounded by a complete turn of an Ω-shaped water channel for most effective cooling.

Two different hearth volumes are available: the 4 cm³ (O.D. 22mm, taper 15°) geometry is compatible with standard crucible liners, while the 5 cm³ (O.D. 23mm, taper 12°) model is recommended for Si epitaxy (in combination with specially adapted silicon shielding parts).

The 270° beam deflection design of the electron emitter eliminates nearly all ion bombardment on the filament, due to a sharply bent electron beam path near the beam exit aperture. In this way, the filament is well shielded from evaporant or charged particles ejected from the crucible. In addition, the sample is shielded from direct sight onto the hot tungsten filament, further reducing the chance of sample contamination by impurities from the hot emitter area.

EBVV 63-4, view onto emitter block and filament

Application

The small dimensions and the vertical evaporator design open the path to a new range of applications:

In standard MBE systems and the majority of home-made UHV chambers there are often no horizontal ports designated for typical e-beam evaporators. Here the compact design of the EBVV allows the integration of a powerful electron beam evaporator into virtually every UHV growth system.

The EBVV closes the gap between small rod-fed e-guns, usually providing very low fluxes and only suitable for sublimating evaporants, and common horizontally mounted e-beam evaporators, which often are excessively space-consuming and far overrated for most MBE applications. EBVV evaporators may even be a good alternative to radiation heated high temperature sources running into their flux. temperature or purity limits

The EBVV is the ideal evaporator for any low or very low vapor pressure material, including refractory metals or dopants such as boron or carbon. It can also serve the upcoming demands in newly developed material systems like high-k materials (Al₂O₃ or Pr₃O₃) or other oxides and dielectrics.

For metal deposition the EBVV 63-4 can be used with bare copper hearth, in particular for all metals that do not melt completely (e.g., Al) or that are not reacting with the cooled copper wall. Crucible liners manufactured from graphite or refractory metals are available for other materials.
Please inquire about a solution for your particular evaporation material.

For Boron doping applications we offer the specialized e-beam evaporator type EBVV-B.

EBVV 63-5, pool of molten silicon (EBVV is mounted into a port 35° to the vertical axis)

Silicon shielding parts for SiGe MBE

SiGe MBE is another key application for the EBVV. For Si growth in an MBE system the use of the EBVV 63-5 is recommended because hearth capacity and geometry are optimized for this special application.

A set of specially adapted shielding parts manufactured from high purity single-crystalline Si is available for this model. All parts of the metallic body that are potentially subject to electron or ion bombardment and that face the substrate are covered by a top Si plate and ring.
This kind of shielding is a qualification for the growth of highest purity Si-based films with virtually no metallic contamination. The set is complemented by a high purity Si charge, source material in superior quality machined from wafer-grade Si single crystals, that fits the hearth closely.

Set of silicon shielding parts for EBVV 63-5

EBVV 63-5, with shielding parts

Technical data
Mounting flange	DN63CF (O.D.4,5“) or DN100CF (O.D.6“)
Dimensions in UHV	L=234-400 mm; D=60 mm
Hearth dimensions	H=15 mm; Ø=22 mm (15° taper) or Ø=23 mm (12° taper)
Bakeout temperature	200°
Spot size	5 mm diameter, approx.
Primary beam deflection	270° by permanent magnet system
Water cooling	Min. water flow rate 5 l/min at 4 bar
Options	Tilted hearth (T); integrated rotary shutter (S)

Dimensions

Schematic drawing of the Vertical Electron Beam Evaporator EBVV

(drawing shows EBVV 63-5)

Specific data

For general information on CF mounting flanges see Flange and Gasket dimensions.


		[cm³]		[mm] / [mm]	[kW] / [mA]	Product code
EBVV	63-	4-	S**-	L250-400 / D60	3 / 500	HV
EBVV	63-	5-	S**-	L250-400 / D60	3 / 500	HV

*	manual or automated shutter actuation
**	same diameter D=60 mm with shutter
***	specify UHV length L with order

Related products

The following list provides suggestions for related products. For additional product suggestions or more detailed information, please contact us.

Components


Electron Beam Evaporator EBV	High Temperature Effusion Cell HTEZ	High Temperature Source HTS

Accessories


High Voltage Power Supplies HV	Soft-acting Rotary Shutter Module RSM	Quartz Crystal Monitor QCM

Systems


OCTOPLUS 300	OCTOPLUS 500 EBV	OCTOPLUS 600 EBV