Journal
OPTICS EXPRESS
Volume 23, Issue 19, Pages A1334-A1341Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.23.0A1334
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Funding
- Korea Ministry of Science, ICT & Future through the Global Frontier R&D Program on Center for Multiscale Energy System [2011-0031567]
- Human Resources Development Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Korea government Ministry of Trade, Industry, and Energy [20124010203170]
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We demonstrate that nanocrystalline Al-doped zinc oxide (n-AZO) thin film used as an electron-extraction layer can significantly enhance the performance of inverted polymer solar cells based on the bulk heterojunction of poly[[9-(1-octylnonyl)-9H-carbazole-2,7-diyl]-2,5-thiophenediyl-2,1,3-benzothiadiazole-4,7-diyl-2,5-thiophenediyl] (PCDTBT) and [6,6]-phenyl C71-butyric acid methyl ester (PC70BM). A synergistic study with both simulation and experiment on n-AZO was carried out to offer a rational guidance for the efficiency improvement. As a result, An n-AZO film with an average grain size of 13 to 22 nm was prepared by a sol-gel spin-coating method, and a minimum resistivity of 2.1 x 10(-3) Omega.cm was obtained for an Al-doping concentration of 5.83 at.%. When an n-AZO film with a 5.83 at.% Al concentration was inserted between the ITO electrode and the active layer (PCDTBT:PC70BM), the power conversion efficiency increased from 3.7 to 5.6%. (C) 2015 Optical Society of America
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