共 21 条
Cesium carbonate as a functional interlayer for polymer photovoltaic devices
被引:94
作者:

Chen, Fang-Chung
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机构:
Natl Chiao Tung Univ, Dept Photon, Hsinchu 300, Taiwan
Natl Chiao Tung Univ, Display Inst, Hsinchu 300, Taiwan Natl Chiao Tung Univ, Dept Photon, Hsinchu 300, Taiwan

Wu, Jyh-Lih
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机构:
Natl Tsing Hua Univ, Inst Photon Technol, Hsinchu 300, Taiwan Natl Chiao Tung Univ, Dept Photon, Hsinchu 300, Taiwan

Yang, Sidney S.
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Natl Tsing Hua Univ, Inst Photon Technol, Hsinchu 300, Taiwan Natl Chiao Tung Univ, Dept Photon, Hsinchu 300, Taiwan

Hsieh, Kuo-Huang
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机构:
Natl Taiwan Univ, Inst Polymer Sci & Engn, Taipei 106, Taiwan Natl Chiao Tung Univ, Dept Photon, Hsinchu 300, Taiwan

Chen, Wen-Chang
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机构:
Natl Taiwan Univ, Inst Polymer Sci & Engn, Taipei 106, Taiwan Natl Chiao Tung Univ, Dept Photon, Hsinchu 300, Taiwan
机构:
[1] Natl Chiao Tung Univ, Dept Photon, Hsinchu 300, Taiwan
[2] Natl Chiao Tung Univ, Display Inst, Hsinchu 300, Taiwan
[3] Natl Tsing Hua Univ, Inst Photon Technol, Hsinchu 300, Taiwan
[4] Natl Taiwan Univ, Inst Polymer Sci & Engn, Taipei 106, Taiwan
关键词:
D O I:
10.1063/1.2937202
中图分类号:
O59 [应用物理学];
学科分类号:
摘要:
The device characteristics of polymer solar cells with cesium carbonate (Cs2CO3) as an electron-injection interlayer have been investigated. It is found that the insertion of Cs2CO3 at the cathode interface improves the device power conversion efficiency from 2.3% to 3.1%. In order to further understand the mechanism, the interfacial interaction between the active organic layer and the cathode was studied by x-ray photoemission spectroscopy (XPS). The results of XPS measurement indicate the fact that a portion of electrons transfer from the interlayer into the organic layer, resulting in n-type doping. The n-doping effect enhances the efficiency of electron injection and collection. Further, the maximum open-circuit voltage (V-oc) was determined from its temperature dependence. For the device with Cs2CO3, the maximum V-oc is extremely close to the corresponding value of the energy difference between the highest occupied molecular orbital of the electron donor and the lowest unoccupied molecular orbital of the electron acceptor, suggesting a better Ohmic contact. All evidences indicated that Cs2CO3 is a promising candidate as an interlayer to improve the device performance. (C) 2008 American Institute of Physics.
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