標題: In situ electrochemical doping enhances the efficiency of polymer photovoltaic devices
作者: Su, Ming-Shin
Su, Hai-Ching
Kuo, Chih-Yin
Zhou, Yi-Ren
Wei, Kung-Hwa
材料科學與工程學系
照明與能源光電研究所
Department of Materials Science and Engineering
Institute of Lighting and Energy Photonics
公開日期: 2011
摘要: In this study, we found that the formation of a p-i-n junction through in situ electrochemical doping is a promising way to enhance the performance of polymer photovoltaic devices. We applied a pre-bias to metal triflate [LiOTf, KOTf, Ca(OTf)(2), Zn(OTf)(2)]/poly(ethylene oxide) (PEO)-incorporated poly[5-(2'-ethylhexyloxy)-2-methoxy-1,4-phenylenevinylene] (MEH-PPV)/{6}-1-(3-(methoxycarbonyl) propyl)-{5}-1-phenyl-[5,6]-C(61) (PCBM) photovoltaic devices to form p-i-n junctions in their active layers. Auger depth profile analyses and alternating-current capacitance analyses of these doped devices revealed that the positive and negative ions were distributed unequally to form an asymmetrical p-i-n structure in a thin layer of ca. 100 nm of the polymer, and the intrinsic layer became thinner when formed under a higher pre-bias voltage. Atomic force microscopy and transmission electron microscopy revealed that the addition of metal triflate/PEO to MEH-PPV/PCBM improved the morphology of the composite films. Among the various doped devices, the MEH-PPV/PCBM device incorporating a LiOTf/PEO mixture exhibited the highest power conversion efficiency, a 40% increase relative to that of the reference device (MEH-PPV/PCBM).
URI: http://hdl.handle.net/11536/26013
http://dx.doi.org/10.1039/c0jm03550e
ISSN: 0959-9428
DOI: 10.1039/c0jm03550e
期刊: JOURNAL OF MATERIALS CHEMISTRY
Volume: 21
Issue: 17
起始頁: 6217
結束頁: 6224
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