LakeShore Model 8404 AC/DC Hall Effect Measurement System (HMS) can provide a full range of Hall measurements using van der Pauw or Hall probe sample geometries. Options include high resistance and low resistance samples, low mobility samples and variable temperature measurement. 

DC Field measurements : 
Resistance range: 0.5 mΩ to 200 GΩ

AC Field measurements : 
Capable of measuring mobility's down to 0.001 cm²/V.s

Low temperature option : 
Variable Temperature assembly (temperature range 15 K to 350 K)

• The versatile Hall Measurement System employs an AC magnetic field for measuring low mobilities down to 0.001 cm²/V.s, much lower than ever possible using traditional DC field Hall measurement techniques.
• The system also has an unusually high resistance option to measure samples with resistance as high as 200 GΩ in van der Pauw geometry.

A) Publication

1. “X-ray absorption study of defects in reactively sputtered GaN films displaying large variation of conductivity”, M. Monish, C. Nayak, D. S. Sutar, S. N. Jha, D. Bhattacharyya, S. S. Major, Semicond. Sci. Technol., 36(2021), 075019.

2. “A large area flexible p-type transparent conducting CuS ultrathin films generated at liquid-liquid interface”, S. S. Pathak, L. S. Panchakarla, Applied Materials Today, 24(2021), 101152.

3. “Structural, electrical and luminescence properties of (0001) ZnO epitaxial layers grown on c-GaN/sapphire templates by pulsed laser deposition technique”, Simran, S.K. Yadav, S. Dhar, J. Appl. Phys., 131(2022), 015302.

4. M. Mishra, R Saha, L. Tyagi, S. Sushama, S.K. panday, S. Chakrabarti, “Investigation of phosphorus-doping of MgZnO thin films using efficient spin-on dopant process”, Journal of luminescence, 257, 119748 (2023).

5. M. Mishra, S Bhowmick, R Saha, SK Pandey, S Chakrabarti, “Temperature induced conductivity reversal in ZnO thin films”, Proc. SPIE 12422, Oxide-based Materials and Devices XIV, 124220S (2023).

It is desirable to have samples of approximate size (8 mm x 8 mm) and thickness 1- 2 mm. Any sample shape is acceptable but the minimum and maximum size should be 5 mm and 15 mm, respectively. 

Please note that the HMS Facility provides only indium soldering and conductive silver paint for van der pauw contacts to the samples. 

For the first time measurement on a pellet type or solution casted samples, the user must contact the HMS Technical Staff (hms@iitb.ac.in), before registering for a slot. The user should fix up a mutually convenient time to check if it is possible to make point contacts with the available facilities. In case it is not possible to make such point contacts, it will be the responsibility of the user to come prepared for a HMS slot, with four van der pauw contacts of ~ 1 mm size at the periphery of the sample, using suitable metals, like, aluminium or gold, etc., which make ohmic contact to their material.