Ion Energy Distribution Measurements Past, Present and Future
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1 Ion Energy Distribution Measurements Past, Present and Future (*Focus on Retarding Field Analyser Technology*) David Gahan CTO S. Sharma PhD candidate, Mike Hopkins CEO
2 Talk Outline Past Present Future The Ion Energy Distribution Function (IEDF) Retarding Field Analyser (RFA) IEDF of IVDF? Previous state of the art in RFA Technology Recent advances in RFA Technology Floating RFAs for (rf) biased electrodes Pulsed rf and time resolved functionality RFA with spatial resolution Ion Angular Distribution measurement RFAs with ion mass resolution Wireless sensors
3 The Ion Energy Distribution Function Shape of IEDF determined by: sheath potential V s (t) ion transit timeτ i period of sheath potential waveform τ rf V s (t)=v P (t)-(v e (t) Plasma V p (t) Electrode V e (t)
4 The Ion Energy Distribution Function For DC sheath <E> <ev s > E 0 FWHM 2 3eV <V s > Plasma <V p > Electrode <V e >
5 The Ion Energy Distribution Function For RF sheath Ion transit time τ i = V s (t) Plasma V p (t) Electrode V e (t)
6 The Ion Energy Distribution Function
7 The Retarding Field Analyser (RFA) Planar, Gridded Structure G1 prevents plasma entering RFA G2 repels plasma electrons G3 retards ion flow G4 prevents secondary emission from C C collects current of ions
8 The Retarding Field Analyser (RFA) Orifice diameter < Debye length λ D e.g. T e =3eV, N e =10 17 m -3 λ D ~40µm Ion transit length < Ion mean free path λ i RFEA depth 0.8mm ~ 100mTorr in Argon
9 The Retarding Field Analyser (RFA) Nickel Grid RFA
10 The Retarding Field Analyser (RFA) Ion Energy = ev G2 f(e) = di c / dv G2?? 1 0,3 0,8 Ion Current 0,6 0,4 0,2 0,2 0,1 di/dv Retarding Potential (V) / Ion Energy (ev)
11 IVDF or IEDF?? Ion Energy distribution function Variable on Y axis must be a function of E di c / dv G2 = f(e)?? I c nev v = (2E/m) 1/2 I c (E/m) 1/2 di c / dv G2 = f((e/m) 1/2 = f(v)=ivdf!! RFA gives IVDF versus Energy
12 IVDF or IEDF?? x Ion Velocity (ms -1 ) Velocity Distribution (m -4 s) x Ion Energy (ev) 2,5 2 1,5 1 0,5 0 x Ion Energy (ev) Velocity Distribution (m -4 s) Energy Distribution (m -3 ev -1 )
13 Previous State of the Art Previous state of the art Disadvantages: Complex electronics Redesign of rf chuck Not commercially viable as instrument
14 Talk Outline Past Present Future The Ion Energy Distribution Function (IEDF) Retarding Field Analyser (RFA) IEDF of IVDF? Previous state of the art in RFA Technology Recent advances in RFA Technology Floating RFAs for (rf) biased electrodes Pulsed rf and time resolved functionality RFA with spatial resolution Ion Angular Distribution measurement RFAs with ion mass resolution Wireless sensors
15 Recent Advances in RFA Technology RFA design compatible with rf biased electrode
16 Typical installation
17 Typical results
18 Typical results
19 Typical results CCP Oxford Instruments PlasmaLab 100 RIE
20 Pulsed RF Requirements Pulse frequencies in khz range
21 Pulsed RF Plasma IEDF in synchronous pulsed plasmas (with bias power) Bi-modal IEDF (corresponding to ions from ON and OFF periods) Ion energies accessible that are beyond the capabilities of CW ICP plasma with bias power
22 Time Resolved Functionality Filtering prevents good time resolution generally Measurement circuit designed to sit on RF side of filter 1us resolution just released for pulsed RF application
23 Time Resolved Functionality Pulsed CCP example Bottom electrode grounded (till now design only suitable for grounded or floating electrode) Source modulated at 1 khz Square wave modulation, 50% Time Averaged measurement
24 Time Resolved Functionality Pulsed CCP example Time resolved measurement 10us resolution, 1kHz pulse frequency
25 RFA with Spatial Resolution Measures Ion Energy Ion Flux Temperature Spatial Profile from 13 (300mm) and 17 (450mm) Different Locations Ion Energy Range 0 to 2500eV (5keV on request)
26 RFA with Spatial Resolution
27 RFA with Spatial Resolution Argon Plasma, 20mTorr, 100W, 13.56MHz
28 RFA with Spatial Resolution
29 RFA with Spatial Resolution
30 Ion Energy Distribution as a function of Angle Important parameter for anisotropic etching Angular ions travel straight through the spherical fields Multiple detectors located at appropriate angles to collect the ion coming ions Disadvantages Spherical grids difficult to manufacture Physical depth of sensor is large (25mm ) This limits operating pressure i.e. 25mm sensor limited to 2mTorr upper pressure range
31 Ion Energy Distribution as a function of Angle Additional aperture added inside standard RFEA structure A B C RFEA surface Variable aperture aspect ratio Mechanical aspect ratio variation complicated
32 Ion Energy Distribution as a function of Angle E Incoming ion with angle Θ E G2 G3 G1 Lost Acceleration Deceleration E Collected G2 selects the Ion energy Potential of G3 varied wrt G2 to scan angular distribution Energy and angle in integral form multiple derivatives required
33 Ion Energy Distribution as a function of Angle
34 Talk Outline Past Present Future The Ion Energy Distribution Function (IEDF) Retarding Field Analyser (RFA) IEDF of IVDF? Previous state of the art in RFA Technology Recent advances in RFA Technology Floating RFAs for (rf) biased electrodes Pulsed rf and time resolved functionality RFA with spatial resolution Ion Angular Distribution measurement RFAs with ion mass resolution Wireless sensors
35 Ion Mass Resolution G1 G2 G3 Energy selection Mass selection with rf field G4 G2 selects the Ion energy RF field between G2 and G3, scan over suitable frequency range Energy of ions dispersed, proportional to ion mass Energy and mass in integral form complex numerical solutions required
36 Ion Mass Resolution Initial data from an Argon and Argon Oxygen plasma shows that Semion mass can currently resolve to better than 5 AMU. The first product will be released in late O 2 + Ar + Ar +
37 Wireless Sensors KLA On Wafer Approach Measure and store data on wafer IP Minefield Sensor data Analog/Digital Sensors Microcontroller Signal processing Data storage Download Display
38 Wireless Sensors Impedans Approach Patent WO 2011/ A1 Transmit data from RFID sensor to external reader on RF power line RFID sensors sensor data RF Power line RFID Reader Microcontroller Signal processing Data storage Communication Real time Data
39 Wireless Sensors RFID Tags Near field (13.56MHz typically) Inductive coupling of tag to magnetic field circulating around antenna (like a transformer). Varying magnetic flux induces current in tag. Modulate tag load to communicate with reader Field energy decreases proportionally to 1/R 3 (to first order) Near Field
40 Wireless Sensors RFID Tags Far field (UHF, microwave): Backscatter. Modulate back scatter by changing antenna impedance. Field energy decreases proportionally to 1/R. Boundry between near and far field: R = wavelength/2 pi so, once you have reached far field, lower frequencies will have lost significantly more energy than high frequencies Far Field
41 Wireless Sensors RFID Tags Transmission Line coupling TX Field Energy is coupled into transmission line and data transmitted back via line. No loss of field energy over long distances. Similar to near field Primarily inductive coupling. Reader does not need to be source of RF energy. Tags embedded in wafer
42 Wireless Sensors are the Future Impedans will engage with a strategic partner to productize the wireless wafer solution in the Semiconductor market.
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