Evolution of detrimental secondary phases in unstable Cu2ZnSnS4 films during annealing

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• 作者：Hyo Rim Jung ; Seung Wook Shin ; K. V. Gurav ; Myeng Gil Gang…
• 关键词：Cu2ZnSnS4 (CZTS) ; thin film solar cells (TFSCs) ; Cu ; S phase segregation ; transmission electron microscopy (TEM) ; earth abundant elements
• 刊名：Electronic Materials Letters
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：12
• 期：1
• 页码：139-146
• 全文大小：2,081 KB
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• 作者单位：Hyo Rim Jung (1)
  Seung Wook Shin (4)
  K. V. Gurav (1) (3)
  Myeng Gil Gang (1)
  Jeong Yong Lee (2)
  Jong Ha Moon (1)
  Jin Hyeok Kim (1)
  
  1. Optoelectronic Convergence Research Center, Department of Materials Science and Engineering, Chonnam National University, Gwangju, 500-757, Korea
  4. Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota, 55455, USA
  3. Department of Physics, Devchand College, Arjunnagar, India
  2. Center for Nanomaterials and Chemical Reactions, Institute for Basic Science, Daejeon, 305-701, Korea
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Condensed Matter Physics
  Electronics, Microelectronics and Instrumentation
  Optical and Electronic Materials
  Thermodynamics
  Characterization and Evaluation of Materials
  
• 出版者：The Korean Institute of Metals and Materials, co-published with Springer Netherlands
• ISSN：2093-6788

文摘

The formation and phase evolution of Cu-S based compounds in kesterite Cu<sub>2sub>ZnSnS<sub>4sub> (CZTS) absorbing thin films is a critical factor affecting the performance of these materials in thin film solar cells (TFSCs). However, to the best of our knowledge, few studies have investigated the segregation of Cu-S based compounds in kesterite thin films during the sulfurization process. In this study, stacked Cu/SnS<sub>2sub>/ZnS precursor thin films were annealed to systematically study the segregation and phase evolution of Cu-S based compounds in kesterite thin films subjected to functional sulfurization times at 550°C. The stacked precursor thin films appeared to be fully transformed to the pure kesterite phase when the sulfurization times are over 30 min. when analyzed using X-ray diffraction and Raman spectroscopy. However, transmission electron microscopy (TEM) characterization revealed that Cu-S based compounds segregated in the kesterite CZTS thin films annealed for 120 min. at 550°C. Based on the experimental results obtained for functional sulfurization times, a mechanism for Cu-S based compounds segregation and the phase evolution process is proposed.