Seo, Han-Kyu Ok, Eun-A Kim, Won-Mok Park, Jong-Keuk Seong, Tae-Yeon Lee, Dong Wha Cho, Hoon Young Jeong, Jeung-Hyun 2024-01-20T11:03:24Z 2024-01-20T11:03:24Z 2021-09-05 2013-11-01 0040-6090 https://pubs.kist.re.kr/handle/201004/127450 The effects of varying the conditions for the chemical bath deposition (CBD) of cadmium sulfide (CdS) layers on CdS/Cu(In,Ga)Se-2 (CIGS) hetero-junctions were investigated using photoluminescence (PL), electroluminescence (EL), deep level transient spectroscopy (DLTS), and red-light-illuminated current-voltage (I-V) measurements. We demonstrated that varying CBD-CdS conditions such as the temperature and time influenced the recombination pathways around the CdS/CIGS junction via the formation of different electronic defects, which eventually changed the photovoltaic conversion efficiency. As the CBD-CdS time and temperature were increased, the cell efficiency decreased. PL measurements revealed that this degradation of the cell efficiency was accompanied by increases in the defect-related recombination, which were attributed to the existence of donor defects around CdS/CIGS having an energy level of 0.65 eV below conduction band, as revealed by DLTS. Increasing distortions in the red-light-illuminated I-V characteristics suggested that the related defects might also have played a critical role in metastable changes around the CdS/CIGS junction. Because the CBD-CdS time and temperature were considered to influence the diffusion of impurities into the CIGS surface, the evolution of the efficiency, PL spectra, defect populations, and red-light-illuminated I-V characteristics observed in this work could be attributed to the diffusion of impurities during the CBD-CdS process. (C) 2013 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE SA BUFFER LAYERS Electrical and optical characterization of the influence of chemical bath deposition time and temperature on CdS/Cu(In,Ga)Se-2 junction properties in Cu(In,Ga)Se-2 solar cells Article 10.1016/j.tsf.2013.05.024 1 THIN SOLID FILMS, v.546, pp.289 - 293 THIN SOLID FILMS 546 289 293 scie scopus 000325092000060 2-s2.0-84885307229 Materials Science, Multidisciplinary Materials Science, Coatings & Films Physics, Applied Physics, Condensed Matter Materials Science Physics Article; Proceedings Paper BUFFER LAYERS CIGS solar cell CBD-CdS Recombination Photoluminescence Metastability DLTS