Latest revision as of 12:53, 6 February 2023

Feedback to this page: click here

This page is written by DTU Nanolab internal

The SEM LEO has been decommissioned and relocated to DTU Mechanics

The SEM LEO was a very reliable and rugged instrument that provided high quality SEM images of most samples and it served the users of the cleanroom for many years. Excellent images on a large variety of materials such as semiconductors, semiconductor oxides or nitrides, metals, thin films and some polymers were acquired by the thousands on the SEM.

In her later years the SEM LEO was equipped with a Raith e-beam lithography system and was exclusively dedicated to the users of the Raith E-beam lithography. Decommissioned in early summer 2020, she is at DTU Mechanics.

The user manual, control instruction and the user APV can still be found in LabManager:

SEM LEO info page in LabManager,

Performance information

SEM comparison page

Raith Elphy e-beam lithography system

Typical current values for EBL

Reported values are the average of five measurements from Elphy Quantum using the EBL holder's Faraday cup. All values in pA.

	5kV	10kV	15kV	20kV
LEO - Current measurements 11/02/2017
10um	13	17	20.5	25
20um	62	87	105	127
30um	160	175	215	264
60um	510	680	850	1040

Equipment performance

Equipment		SEM LEO (Leo 1550 SEM)
Purpose	Imaging and measurement of	Conducting samples Semi-conducting samples Thin (~ 5 µm <) layers of non-conducting materials such as polymers
Purpose	Other purpose	E-beam lithography using Raith Elphy Quantum system
Location		Cleanroom of DTU Nanolab
Performance	Resolution	~ 5 nm (limited by vibrations) The resolution is strongly dependent on the type of sample and the skills of the operator.
Instrument specifics	Detectors	Secondary electron (Se2) Inlens secondary electron (Inlens) Backscatter electron (BSD)
	Stage	X, Y: 125 × 100 mm T: 0 to 90^o R: 360^o Z: 48 mm
	Electron source	FEG (Field Emission Gun) source
	Operating pressures	Fixed at High vacuum (2 × 10^-5mbar - 10^-6mbar)
	Options	Raith Elphy Quantum E-Beam Litography system
Substrates	Batch size	Wafers up to 6" (only full view up to 4")
	Allowed materials	Any standard cleanroom materials.

@@ Line 1: / Line 1: @@
-=<span style="background:#FF2800">THIS PAGE IS UNDER CONSTRUCTION</span>[[image:Under_construction.png|200px]]=
-'''Feedback to this page''': '''[mailto:labadviser@danchip.dtu.dk?Subject=Feed%20back%20from%20page%20http://labadviser.danchip.dtu.dk/index.php/Specific_Process_Knowledge/Characterization/SEM_LEO0 click here]'''
+'''Feedback to this page''': '''[mailto:labadviser@nanolab.dtu.dk?Subject=Feed%20back%20from%20page%20http://labadviser.nanolab.dtu.dk/index.php/Specific_Process_Knowledge/Characterization/SEM_LEO0 click here]'''
-=SEM LEO=
+''This page is written by DTU Nanolab  internal''
-[[image:IMG_3290.jpg|400x400px|right|thumb|The SEM LEO]]
+=The SEM LEO has been decommissioned and relocated to DTU Mechanics=
-A Danchip there are four scanning electron microscopes (SEMs). These SEMs cover a wide range of needs both in the cleanroom and outside: From the fast in-process verification of different process parameters such as etch rates, step coverages or lift-off quality to the ultra high resolution images on any type of sample intended for publication.
+[[image:IMG_3290.jpg|400x400px|right|thumb|The SEM LEO located in cleanroom F-2]]
-All SEMs are operated by use of the same software, hardpanel and joystick. But there are small hardware differences, thus a training is needed for each SEM you want to use.
+The SEM LEO was a very reliable and rugged instrument that provided high quality SEM  images of most samples and it served the users of the cleanroom for many years. Excellent images on a large variety of materials such as semiconductors, semiconductor oxides or nitrides, metals, thin films and some polymers were acquired by the thousands on the SEM.
-The SEM LEO was installed in the cleanroom in the 1998, and the software was ungraded in 2012.
+In her later years the SEM LEO was equipped with a Raith e-beam lithography system and was exclusively dedicated to the users of the Raith E-beam lithography. Decommissioned in early summer 2020, she is at DTU Mechanics.
-This SEM will cover most users need. It is a very reliable and rugged instrument that provides high quality images of most samples. Excellent images on a large variety of materials such as semiconductors, semiconductor oxides or nitrides, metals, thin films and some polymers may be acquired on the SEM.
+'''The user manual, control instruction and the user APV can still be found in LabManager:'''
-The SEM LEO is good, reliable, the software is basically indentical to the SEM Zeiss software, and for conducting samples (or thin layers, < 5-10 µm, of hard non-conducting materials such as oxide/nitride on top a conducting substrate) the resolution of the SEM LEO is almost comparable to the both the SEM 1, SEM 2 and SEM 3 Supra 60VP.
+[http://labmanager.dtu.dk/function.php?module=Machine&view=view&mach=37 SEM LEO info page in LabManager],
+== Performance information ==
+*[[Specific Process Knowledge/Characterization/SEM: Scanning Electron Microscopy|SEM comparison page]]
-The SEM is is equipped with a Raith e-beam writing system.
+*[[Specific Process Knowledge/Lithography/EBeamLithography/RaithElphy|Raith Elphy e-beam lithography system]]
+===Typical current values for EBL===
+Reported values are the average of five measurements from Elphy Quantum using the EBL holder's Faraday cup. All values in pA.
-'''The user manual, control instruction, the user APV and contact information can be found in LabManager:'''
+{| border="1" style="text-align: center; width: 320px; height: 200px;"
+|-
-[http://labmanager.dtu.dk/function.php?module=Machine&view=view&mach=37 SEM LEO info page in LabManager],
+|colspan="6" style="text-align: center;" style="background: #efefef;" | '''LEO - Current measurements 11/02/2017'''
+|-
+!scope="row" |&nbsp;
+!|5kV
+!|10kV
+!|15kV
+!|20kV
-== Performance information ==
+|-
-*[[Specific Process Knowledge/Characterization/SEM: Scanning Electron Microscopy|SEM comparison page]]
-*[[Specific Process Knowledge/Lithography/EBeamLithography/RaithElphy|Raith Elphy e-beam lithography system]]
+|-
+!10um
+|13
+|17
+|20.5
+|25
+|-
+|-
+!20um
+|62
+|87
+|105
+|127
+|-
+|-
+!30um
+|160
+|175
+|215
+|264
+|-
+!60um
+|510
+|680
+|850
+|1040
+|}
-==Equipment performance and process related parameters==
+==Equipment performance==
 {| border="2" cellspacing="0" cellpadding="2"
@@ Line 38: / Line 77: @@
 |style="background:WhiteSmoke; color:black"|<b>SEM LEO (Leo 1550 SEM)</b>
 |-
-!style="background:silver; color:black;" align="center" width="60"|Purpose
+!style="background:silver; color:black" align="center" valign="center" rowspan="2"|Purpose
 |style="background:LightGrey; color:black"|Imaging and measurement of
 |style="background:WhiteSmoke; color:black"|
-*Any (semi)conducting sample that may have thin (> ~ 5 µm) layers of non-conducting materials on top
+* Conducting samples
+* Semi-conducting samples
+* Thin (~ 5 µm <) layers of non-conducting materials such as polymers
+|-
+|style="background:LightGrey; color:black"|Other purpose
+|style="background:WhiteSmoke; color:black"|
+*E-beam lithography using Raith Elphy Quantum system
 |-
 !style="background:silver; color:black;" align="center" width="60"|Location
 |style="background:LightGrey; color:black"|
 |style="background:WhiteSmoke; color:black"|
-*Cleanroom of DTU Danchip
+*Cleanroom of DTU Nanolab
 |-
 !style="background:silver; color:black;" align="center" width="60"|Performance
@@ Line 83: / Line 128: @@
 |style="background:LightGrey; color:black"|Batch size
 |style="background:WhiteSmoke; color:black"|
-*1 100 mm wafer
+*Wafers up to 6" (only full view up to 4")
-*1 150 mm wafer (not full view)
-*Smaller samples
 |-
 | style="background:LightGrey; color:black"|Allowed materials
 |style="background:WhiteSmoke; color:black"|
 *Any standard cleanroom materials.
-Use dedicated samples holders for samples from Black Magic PECVD
 |-
 |}