Journal
IEEE JOURNAL OF PHOTOVOLTAICS
Volume 6, Issue 4, Pages 930-933Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOTOV.2016.2553780
Keywords
Doping; electron extraction layer; inverted structure; organic photovoltaics (OPVs); ZnO
Funding
- Human Resources Development Program of the Korea Institute of Energy Technology Evaluation and Planning - Korea Government Ministry of Knowledge Economy [20124010203170]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20124010203170] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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High-efficiency organic photovoltaics (OPV) with a PTB7:PC70BM photoabsorption layer were fabricated by adopting Li- and Cd-doped ZnO electron extraction layers. For devices with both Li- and Cd-doped ZnO, the performances were significantly improved, including the short-circuit current, open-circuit voltage, fill factor (FF), and power conversion efficiency. Furthermore, film characterization with techniques including X-ray diffraction, high-resolution transmission electron microscopy, and resistivity analysis was performed. The results suggest that the improved electrical properties of Li-and Cd-doped ZnO electron extraction layers with a doping ratio of approximately 6 at% are highly effective in achieving a power conversion efficiency of up to 8%.
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