How can I evaluate the band gap of my ZnO thin film.
Thickness=d=80 nm I’m aware of alpha=-1/d*log(T) But I can’t fit a line to my data. And: How can I smoothen my data on about 346 nm? Do you have any other idea for calculation of band gap from Transmittance and Absorbtion of light by thin films?
h=4.13566733e-15; %# eV.s c=299792458; %# m/s %# landa in (nm) nu=c./(landa*1e-9); %# 1/s alpha=-1/(50e-7)*log(T50); %# 1/cm E=h*nu; %# eV Y=alpha.^2; plot(E,Y);