* For contact enhancement on low-doped p-samples we need In-Ga eutectic (Alfa Aesar #12478, 10g will be enough for years, cost about 70-100 EUR).
* For low-doped n-samples we need Ga-Sn eutectic (Alfa Aesar #18161, again only 10g, cost about 70-100 EUR).
* Ammonium hydrogen Bifluoride (ABF, also called Amm.-Hydr. Difluoride), e. g. VWR Germany 1.01164 (98.5%), also possible Alfa Aesar #L17237 (only 95%), CAS-Nr. 1341-49-7, (NH4)HF2 [typ. ordered in a 1kg package, cost about 30-50 EUR, only 2.85g are required for 0.5l electrolyte]. ATTENTION: AmmoniumFlouride (NH4F) does NOT work!
* KCl salt for the storage bin for the reference electrode (very cheap salt - usually about 100g will be enough for about 10 years, but you can order it typically only in quantity of 500g or 1kg - please order p.a. grade (not so critical, e. g. Alfa Aesar A11662). (ABF is a very common “not so dangerous” replacement material for HF for metallurgical industry – you for sure can get this in good 95% quality also from a local supplier in India – just please order “p.a. (pro analysis)” grade).