Characterization of temperature-dependent carrier transport in disordered indium-tin-oxide/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)/polyfluorene/Ca/Al polymer structures |
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Authors: | Joe-Air JiangJen-Cheng Wang Chia-Hui FangYa-Fen Wu Jen-Wei TengYu-Ting Chen Ping-Lin FanTzer-En Nee |
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Affiliation: | a Department of Bio-Industrial Mechatronics Engineering, National Taiwan University, 1, Sec. 4, Roosevelt Road, Taipei 106, Taiwan, Republic of Chinab Graduate Institute of Electro-Optical Engineering and Department of Electronic Engineering, Chang Gung University, 259 Wen-Hwa 1st Road, Kwei-Shan, Tao-Yuan 333, Taiwan, Republic of Chinac Department of Electronic Engineering, Ming Chi University of Technology, No. 84, Gongzhuan Road, Taishan Dist., New Taipei City 243, Taiwan, Republic of Chinad Department of Digital Technology Design and Graduate School of Toy and Game Design, National Taipei University of Education, No. 134, Sec. 2, Heping E. Road, Taipei 106, Taiwan, Republic of China |
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Abstract: | The temperature-dependent electrical characteristics of polyfluorene-based polymer structures over a temperature range from 200 to 300 K are systematically investigated in this study. Initially, using the definitions of the Berthelot-type model, it is found that the sample exhibits a higher Berthelot-type temperature TB with high driving voltage, indicating that carrier transport in a disordered system manifests Berthelot-type behaviors. The ideal current density-voltage curve for the polymer structures given the carrier transmit mechanism is further elucidated by taking into account the ohmic conduction, trap charge limited current, and Mott and Gurney model of space charge limited current. The proposed procedure is simple and can be used to characterize the material with reasonable accuracy. We also study the density of the traps Ht, and the characteristic energy of the distribution Et to better understand the carrier-transport process in organic materials and structures. |
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Keywords: | Polymer structures Berthelot-type Disorder |
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