Modification of light absorption in thin CuInS2 films by sprayed Au nanoparticles

Table 1 Au nanoparticle size and Au mean crystallite size in nanoparticles

Configuration	HAuCl₄solution volume (ml)	Nanoparticle size (nm)	Crystallite size (nm)
Glass/Au-NP	2.5	30 to 50	36
	5	50 to 80	38
	15	25 to 200	30
Glass/CIS/Au-NP	2.5	20 to 60	15
Glass/CIS/Au-NP	10	20 to 60	19
	15	20 to 200	20

The size of Au nanoparticles on glass (glass/Au-NP) and on CIS (glass/CIS/Au-NP) as evaluated from SEM images, and the mean crystallite size of Au as calculated from the FWHM of the (111) diffraction peak of Au according to the Scherrer formula. Au nanoparticles were deposited by spray pyrolysis of 2 mM HAuCl₄ solution at 340°C.