Photovoltaic and Electroluminescence Characters in Hybrid ZnO and Conjugated Polymer Bulk Heterojunction Devices |
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Authors: | LIU Jun-Peng QU Sheng-Chun XU Ying CHEN Yong-Hai ZENG Xiang-Bo WANG Zhi-Jie ZHOU Hui-Ying WANG Zhan-Guo |
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Affiliation: | 1 Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences Beijing 100083; 2Beijing Solar Energy Research Institute |
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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 deviceswith photovoltaic effect and electroluminescence character. |
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Keywords: | 73.50.Pz 78.60.Fi |
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