A Study on the Band Structure of ZnO/CdS Heterojunction for CIGS Solar-Cell Application
- Authors
- Sim, Hana; Lee, Jeongmin; Cho, Seongjae; Cho, Eou-Sik; Kwon, Sang Jik
- Issue Date
- Apr-2015
- Publisher
- IEEK PUBLICATION CENTER
- Keywords
- CIGS solar cell; atomic layer deposition; chemical bath deposition; ZnO; CdS; heterojunction; transmittance; XPS; UPS; ionization potential energy; conduction band offset
- Citation
- JOURNAL OF SEMICONDUCTOR TECHNOLOGY AND SCIENCE, v.15, no.2, pp.267 - 275
- Journal Title
- JOURNAL OF SEMICONDUCTOR TECHNOLOGY AND SCIENCE
- Volume
- 15
- Number
- 2
- Start Page
- 267
- End Page
- 275
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/10680
- DOI
- 10.5573/JSTS.2015.15.2.267
- ISSN
- 1598-1657
- Abstract
- In this paper, ZnO films were prepared by atomic layer deposition (ALD) and CdS films were deposited using chemical bath deposition (CBD) to form ZnO/CdS heterojunction. More accurate mapping of band arrangement of the ZnO/CdS heterojunction has been performed by analyzing its electrical and optical characteristics in depth by various methods including transmittance, x-ray photoemission spectroscopy (XPS), and ultraviolet photoemission spectroscopy (UPS). The optical bandgap energies (E-g) of ZnO and CdS were 3.27 eV and 2.34 eV, respectively. UPS was capable of extracting the ionization potential energies (IPEs) of the materials, which turned out to be 8.69 eV and 7.30 eV, respectively. The electron affinity (EA) values of ZnO and CdS calculated from IPE and E-g were 5.42 eV and 4.96 eV, respectively. Energy-band structures of the heterojunction could be accurately drawn from these parameters taking the conduction band offset (CBO) into account, which will substantially help acquisition of the full band structures of the thin films in the CIGS solar-cell device and contribute to the optimal device designs.
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Collections - IT융합대학 > 전자공학과 > 1. Journal Articles
- 예술대학 > 미술·디자인학부(디자인) > 1. Journal Articles
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