1. Film thickness determination
Dr. E U Masumdar
Associate Professor,
Department of Physics
Rajarshi Shahu Mahavidyalaya, Latur

2. Spray Deposition Process
Exhaust
Switch 2
Gas In
Switch 1
Substrates
Hot Plate
Spray Deposition Process

3. n0 n1 d n2 Incident light ( l ) Detector Reflected light Air
Refractive indices n1
F: SnO2 thin film d
Film thickness n2
Glass substrate
Transmitted light
Detector

4. T l (nm) Calculated Experimental
Cauchey’s relation derived from Fresnel’s transmission and reflection coefficients

6. Substrate Temperature (oC) Thickness (nm) Refractive Index
Solution quantity = 20 ml
Substrate Temperature (oC)
Thickness (nm)
Refractive Index
450
440
1.72
475
740
1.65
500
620
1.62
525
445
1.78
Substrate Temperature = 475 oC
Solution quantity (ml)
Thickness (nm)
Refractive Index 10
432
1.88 20
740
1.65 30
1115 40
1250
1.76