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A cascade energy band structure enhances the carrier energy in organic vertical-type triodes |
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| Authors: | Shiau-Shin Cheng Mohan Ramesh Guan-Yuan Chen Chun-Lin Fung Li-Ming Chen Meng-Chyi Wu Hong-Cheu Lin Chih-Wei Chu |
| Affiliation: | 1. Department of Electrical Engineering, National Tsing-Hua University, Hsinchu 30013, Taiwan, ROC;2. Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan, ROC;3. Research Center for Applied Sciences, Academia Sinica, Taipei 11529, Taiwan, ROC;4. Department of Photonics, National Chiao-Tung University, Hsinchu 30010, Taiwan, ROC |
| Abstract: | Organic vertical-type triodes (OVTs) based on the cascade energy band structure as emitter layer are studied. The electric characteristics were dramatically enhanced while incorporating the cascade energy under current driving and voltage driving modes. The improvement is attributed to that injection carriers can obtain higher energy through a stepwise energy level. When the device has a layered structure of F16CuPC (10 nm)/PTCDI (10 nm)/pentacene (100 nm) in emitter, it exhibits a common-base transport factor of 0.99 and a common-emitter current gain of 225 under current driving mode and exhibits a high current modulation-exceeding ?520 μA for a low collector voltage of ?5 V and a base voltage of ?5 V and the current on/off ratio of 103 under voltage driving mode. Furthermore, we realized first organic current mirror that exhibited out/in current ratio of 0.75 and output resistance of 105 Ω by using the OVTs. |
| Keywords: | Organic semiconductor Vertical-type transistor Cascade-type Transport factor Current gain Current mirror |
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