Seebeck Coefficient and Optical Studies of Cadmium Doped CuInS₂Single Crystal

Abstract

Single crystals of CuInS 2 were successfully grown by chemical vapor transport technique using iodine as transporting agent. The as-grown chemical vapor transport CuInS 2 single crystals were found to have large resistivity. To decrease the resistivity of the crystals they were doped with three different cadmium concentrations. Seebeck coefficient variation with temperature is measured for all the three doped samples. Optical bandgaps were determined for these three doped samples using optical absorption spectra. The obtained results are discussed in detail.

Structural and Optical Study of Ga3+ Substitution in CuInS2 Nanoparticles Synthesized by a One-Pot Facile Method

“…Thin film solar cells are interesting because they are lightweight, have good photostability, are cost-effective, and are able to be fabricated on flexible substrates. − Thin films based on CuIn x Ga 1– x (S 1– y Se y ) 2 ( x , y = 0–1) (CIGSSe) compounds are attractive due to the high solar absorption coefficient (more than 10 5 cm –1 ). Also, band gap tuning of the CIGSSe compounds can be adjusted from 0.98 eV for CISe to 2.40 eV for CGS which is a wide spectral region from visible to near-infrared. − Recent studies indicate that CIGSSe solar cells have exhibited the highest solar energy conversion efficiency (20.8%) among thin film solar cell groups. − They are fabricated by rather expensive methods such as molecular beam epitaxy, coevaporation, sputtering, pulse laser deposition, and electrodeposition . One of the trends in this field is reducing the production cost by introducing low cost preparation protocols like printing methods.…”

“…7−10 Recent studies indicate that CIGSSe solar cells have exhibited the highest solar energy conversion efficiency (20.8%) among thin film solar cell groups. 11−15 They are fabricated by rather expensive methods such as molecular beam epitaxy, 16 coevaporation, 17 sputtering, 18 pulse laser deposition, 19 and electrodeposition. 20 One of the trends in this field is reducing the production cost by introducing low cost preparation protocols like printing methods.…”