03244nas a2200241 4500008004100000245011700041210006900158260000800227300001600235490000700251520241500258100002402673700002002697700002002717700001802737700001602755700001902771700002102790700001902811700002102830700001902851856013202870 2019 eng d00aProbing the effect of selenium substitution in kesterite-Cu2ZnSnS4 nanocrystals prepared by hot injection method0 aProbing the effect of selenium substitution in kesteriteCu2ZnSnS cAUG a14781-147900 v303 a

In this paper, we report the effect of sulfur (S) substitution with selenium (Se) in CZTS nanocrystals prepared by hot injection method. The formation of kesterite-copper zinc tin sulfide (Cu2ZnSnS4, CZTS) and copper zinc tin selenide (Cu2ZnSnSe4, CZTSe) nanocrystals is confirmed by X-ray diffraction (XRD), Raman spectroscopy and transmission electron microscopy (TEM) analysis. The XRD, TEM and atomic force microscopy (AFM) analysis shows an overall increase in average crystallite size upon Se substitution. AFM images revealed an increase in root mean square surface roughness (S-q) and average surface roughness (S-a) when S in CZTS is replaced by Se. The substitution of S by Se in host CZTS narrows the optical band gap from 1.56 to 1.03 eV. The ultraviolet photoelectron spectroscopy (UPS) analysis shows shift in valence band and conduction band edge in CZTSe compared to CZTS. The photocurrent density measurement in synthesized CZTSe thin films is similar to 4 to 5 times higher than CZTS thin films. The obtained results show that CZTSe can be a promising candidate as absorber material in photovoltaic applications.

1 aPandharkar, Subhash1 aRondiya, Sachin1 aBhorde, Ajinkya1 aNair, Shruthi1 aAher, Rahul1 aVairale, Priti1 aWaghmare, Ashish1 aNaik, Dhirsing1 aWaykar, Ravindra1 aJadhav, Yogesh uhttps://library.ncl.res.in/content/probing-effect-selenium-substitution-kesterite-cu2znsns4-nanocrystals-prepared-hot-injection