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Improved Inverted Organic Solar Cells With a Sol–Gel Derived Indium-Doped Zinc Oxide Buffer Layer

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6 Author(s)
Kyaw, Aung Ko Ko ; Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore, Singapore ; Xiaowei Sun ; De Wei Zhao ; Swee Tiam Tan
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We studied sol-gel derived indium-doped zinc oxide (IZO) with various indium contents as a functional buffer layer in inverted polymer:fullerene bulk-heterojunction solar cell. The short-circuit current density was observed to increase by doping indium in pure ZnO buffer layer. The maximum current density was obtained with a 1 at.% indium doping. Although the open-circuit voltage and fill factor reduced slightly, the inverted organic solar cell with 1 at.% IZO buffer layer showed a power conversion efficiency of 3.3%, which is higher compared to that (2.94%) of the device with undoped ZnO buffer layer under illumination of AM1.5G. The better performance is due to combined effects of improvement in charge collection and higher optical transmittance of electrode/buffer layer stack.

Published in:

Selected Topics in Quantum Electronics, IEEE Journal of  (Volume:16 ,  Issue: 6 )

Date of Publication:

Nov.-Dec. 2010

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