| Original Articles |
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Enhanced Efficiency of Polymer: Fullerene Bulk Heterojunction Solar Cells with the Insertion of Thin TiO2 Layer near the LiF/Al Electrode |
| LI Yan;HOU Yan-Bing;JIN Hui;SHI Quan-Min;LIU Jun;SUN Xin;CHANG Xiao-Wei |
| Key Laboratory of Luminescence and Optical Information (Ministry of Education), Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044 |
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| Cite this article: |
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LI Yan, HOU Yan-Bing, JIN Hui et al 2007 Chin. Phys. Lett. 24 818-821 |
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Abstract The insertion layer of TiO2 between polymer-fullerene blend and LiF/Al electrode is used to enhance the short-circuit current I sc and fill factor (FF). The solar cell based on the blend of poly[2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) and C60 with the modifying layer of TiO2 (about 20nm) shows the open-circuit Voc of about 0.62V, short circuit current Isc of about 2.35mA/cm2, filling factor FF of about 0.284, and the power conversion efficiency (PCE) of about 2.4% under monochromatic light (500nm) photoexcitation of about 17mW/cm 2. Compared to cells without the TiO2
layer, the power conversion efficiency increases by about 17.5%. Similar effect is also obtained in cells with the undoped MEH-PPV structure of ITO/PEDOT:PASS/MEH-PPV/(TiO2)LiF/Al. The improved solar cell performance can be attributed to enhanced carrier extraction efficiency at the active layer/electrode interfaces when TiO2 is inserted.
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| Keywords:
72.40.+w
72.80.Le
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Received: 14 November 2006
Published: 08 February 2007
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| PACS: |
72.40.+w
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(Photoconduction and photovoltaic effects)
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72.80.Le
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(Polymers; organic compounds (including organic semiconductors))
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