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Photovoltaic and Electroluminescence Characters in Hybrid ZnO and Conjugated Polymer Bulk Heterojunction Devices |
| LIU Jun-Peng1;QU Sheng-Chun1;XU Ying2;CHEN Yong-Hai1;ZENG Xiang-Bo1;WANG Zhi-Jie1;ZHOU Hui-Ying1;WANG Zhan-Guo1 |
| 1Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 1000832Beijing Solar Energy Research Institute, Beijing 100083 |
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| Cite this article: |
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LIU Jun-Peng, QU Sheng-Chun, XU Ying et al 2007 Chin. Phys. Lett. 24 1350-1353 |
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Abstract We report electroluminescence in hybrid ZnO and conjugated polymer poly[2-methoxy-5-(3',7'-dimethyloctyloxy)-1,4-phenylenevinylene] (MDMO-PPV) bulk heterojunction photovoltaic cells. Photoluminescence quenching experimental results indicate that the ultrafast photoinduced electron transfer occurs from MDMO-PPV to ZnO under illumination. The ultrafast photoinduced electron transfer effect is induced because ZnO has an electron affinity about 1.2eV greater than that of MDMO-PPV. Electron `back transfer' can occur if the interfacial barrier between ZnO and MDMO-PPV can be overcome by applying a substantial electric field. Therefore, electroluminescence action due to the fact that the back transfer effect can be observed in the ZnO:MDMO-PPV devices since a forward bias is applied. The photovoltaic and electroluminescence actions in the same ZnO:MDMO-PPV device can be induced by different injection ways: photoinjection and electrical injection. The devices are expected to provide an opportunity for dual functionality devices
with photovoltaic effect and electroluminescence character.
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| Keywords:
73.50.Pz
78.60.Fi
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Received: 19 January 2007
Published: 23 April 2007
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| PACS: |
73.50.Pz
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(Photoconduction and photovoltaic effects)
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78.60.Fi
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(Electroluminescence)
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