AVS 66th International Symposium & Exhibition
    Electronic Materials and Photonics Division Thursday Sessions
       Session EM-ThP

Paper EM-ThP11
Optical and Electrical Properties of Layer-by-layered and Mixed ZnS/CdS Structures with a Decrease in Cd-content by Co-sputtering Method

Thursday, October 24, 2019, 6:30 pm, Room Union Station B

Session: Electronic Materials and Photonics Poster Session
Presenter: Geum-Bae Cho, Chosun University, Republic of Korea
Authors: S. Pech, Chosun University, Republic of Korea
Y.-K. Jun, EM Co., Inc., Republic of Korea
G.-B. Cho, Chosun University, Republic of Korea
N.H. Kim, Chosun University, Republic of Korea
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CdS is one of the most attractive n-type II–VI semiconductor materials for window layers or buffer layer in heterojunction thin film solar cells because of its high transmitivity, low resistivity, and excellent permeability with a bandgap of 2.42 eV [1]. However, the use of cadmium would be deleterious for the environment because of carcinogenic and toxic nature. To reduce the use of cadmium ZnS/CdS structures were investigated in this study. ZnS is an n-type semiconductor with relatively high transparency, large Bohr exciton radius (2.5 nm), large exciton binding energy (40 meV), high index of refraction (2.27) [2]. Two types of structure were fabricated with the same thickness: layer-by-layered and mixed structures were fabricated by co-sputtering method with each ZnS and CdS target as a function of Cd-content. Cd-content was adjusted by a sputtering time for CdS target. All samples were annealed in a rapid thermal annealing system at 400°C for 10 min. Structural properties of two-types of structure with the different Cd-content by X-ray diffraction studies. Optical and electrical properties of them were analyzed by using an UV-Visible spectrophotometer and a Hall effect measurement system for optical transmittance, bandgap, resistivity, carrier mobility, and carrier concentration. Acknowledgement: This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. 20184010201650). [1] Nam-Hoon Kim, Seung-Han Ryu, Hyo-Sup Noh, Woo-Sun Lee, Electrical and optical properties of sputter-deposited cadmium sulfide thin films optimized by annealing temperature, Mater. Sci. Semicond. Process. 15, 125 (2012). [2] Sanjeev Kumar, C.L. Chen, C.L. Dong, Y.K. Ho, J.F. Lee, T.S. Chan, R. Thangavel, T.K. Chen, B.H. Mok, S.M. Rao, M.K. Wub, Room temperature ferromagnetism in Ni doped ZnS nanoparticles, J. Alloy Compd. 554, 357 (2013).