Wet chemical etched CdTe thin film solar cells

Seungju Chun, Seunghun Lee, Younghun Jung, Jong Seong Bae, Jihyun Kim, Donghwan Kim

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

Wet chemical etching process on as-deposited CdTe surface using nitric-phosphoric (NP) acid improved the efficiency of CdS/CdTe solar cells from 10.1% to 13.8%. Nitric-phosphoric (NP) acid solution etched native oxide (TeO 2) layer and resolved excess cadmium on CdTe surface. After the heat treatment process activated the CdCl 2, CdO layer which was believed to be a diffusion barrier of chlorine did not grow on the etched CdTe surface and new (V Cd 2--2Cl Te 1+) 0 complexes was located at E V + 0.045 eV. New (V Cd 2--2Cl Te 1+) 0 complexes acted as a shallow acceptors and induced to improve V oc and J sc. The surface of CdTe thin film has been studied using Scanning Electron Microscope (SEM), X-ray Diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and low temperature Photoluminescence (PL).

Original languageEnglish
Pages (from-to)211-216
Number of pages6
JournalCurrent Applied Physics
Volume13
Issue number1
DOIs
Publication statusPublished - 2013 Jan

Bibliographical note

Funding Information:
This work was supported by the Human Resources Development of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Knowledge Economy (No. 20104010100640 ) and by the New & Renewable Energy of the Korea Institute of Energy Technology Evaluation and Planning(KETEP) grant funded by the Korea government Ministry of Knowledge Economy (No. 20093021010010 ).

Keywords

  • CdCl activated heat treatment
  • CdTe thin film solar cells
  • Low temperature photoluminescence (PL)
  • Nitric-phosphoric (NP) etching
  • X-ray photoelectron spectroscopy (XPS)

ASJC Scopus subject areas

  • General Materials Science
  • General Physics and Astronomy

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