Question

n-type infinite source (phosphorus atoms) No 100 atoms/cm (diffuses through a 1 cm window) D(1050°C) 1013 cm2/s T 1050 °C a) Calculate the time required to form a junction at a 1 um depth when diffusing against a p-type background (boron atoms) of 1010 atoms/cm2 b) What is the total number of phosphorus atoms in the sample at this time?

Answer 1

Cphosphorus atoms). GIIvenhat: 74P nfinity Soorts Sol prelepostion OY Givem Cae s of fnfinity Couru NA erte Complementry ewor -finchin) ND ND NA ptype X CJunchon depth) /om2 cm D 50°C Sec ( } "4)M Nser s tme Reuxe tor for to em exfe amc tenu 2.15 2X 215 3305.18 See

Nomber o astoms nhe Sample at 3305.18 phocphauy To-la See OOsex -Ay ea. Total no.oaPamt whna Oote(s) AY es and No e 2YDt erfc Cv du Know -13 x 3305 8 20 2x10 S- 15 atm 2 Cm 2 eO5 X1O C o atom Hcnce Tta SA no хiб 2 005 x 10 atbms