Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 806, Issue -, Pages 976-982Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.07.321
Keywords
Evaporation; Amorphous; InZnO; Transparent conducting oxide; Solar cells
Categories
Funding
- Technology Development Program to Solve Climate Changes of the National Research Foundation (NRF) - Ministry of Science, ICT & Future Planning [2016M1A2A2936754]
- 'New & Renewable Energy' of a Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Ministry of Trade, Industry and Energy [20183010014310, 20193010014830]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20193010014830] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In recent years, amorphous InZnO (a-IZO) film gets recognition for the possibility as a transparent conducting oxide (TCO) layer with outstanding its optical and electrical properties in photovoltaic devices. Generally, the sputtering technique is normally used to deposit a-IZO film, which suffers from plasma damage exerting a negative influence on device performance. Here, we suggest an alternative to deposit a-IZO film with a thermal evaporation technique using a simply customized system to compensate defects by plasma damage. Thermally grown IZO films by controlling two variables of Zn rate and substrate temperature show the distinguishable characters in terms of transparency, conductivity and crystalline structure with a substantial change of Zn content in In1-xZnxO. Zn incorporation in IZO film is considered as a critical key to determining the crystal structure and IZO film quality. In the thermal evaporation system, phase transition occurs from crystalline to amorphous; the IZO film indicates the superior property in the amorphous phase than crystalline structure. We acquired the optimized IZO film with amorphous phase in the relative concentration of In0.73Zn0.27O grown at 200 degrees C. To demonstrate the feasibility of a-IZO film as a TCO layer, Cu(In, Ga)Se-2 solar cell was practically fabricated, which shows excellent performance. It is attributed to the absence of plasma damage during deposition of the a-IZO film, proved by the decrease of shunt resistance in the solar cell. (C) 2019 Elsevier B.V. All rights reserved.
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