High‐Performance Organic Heterojunction Phototransistors Based on Highly Ordered Copper Phthalocyanine/<i>para</i>‐Sexiphenyl Thin Films
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- Chuan Qian
- Hunan Key Laboratory for Super Microstructure and Ultrafast Process School of Physics and Electronics Central South University Changsha Hunan 410083 P. R. China
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- Jia Sun
- Hunan Key Laboratory for Super Microstructure and Ultrafast Process School of Physics and Electronics Central South University Changsha Hunan 410083 P. R. China
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- Ling‐An Kong
- Hunan Key Laboratory for Super Microstructure and Ultrafast Process School of Physics and Electronics Central South University Changsha Hunan 410083 P. R. China
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- Guangyang Gou
- Hunan Key Laboratory for Super Microstructure and Ultrafast Process School of Physics and Electronics Central South University Changsha Hunan 410083 P. R. China
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- Menglong Zhu
- Hunan Key Laboratory for Super Microstructure and Ultrafast Process School of Physics and Electronics Central South University Changsha Hunan 410083 P. R. China
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- Yongbo Yuan
- Hunan Key Laboratory for Super Microstructure and Ultrafast Process School of Physics and Electronics Central South University Changsha Hunan 410083 P. R. China
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- Han Huang
- Hunan Key Laboratory for Super Microstructure and Ultrafast Process School of Physics and Electronics Central South University Changsha Hunan 410083 P. R. China
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- Yongli Gao
- Hunan Key Laboratory for Super Microstructure and Ultrafast Process School of Physics and Electronics Central South University Changsha Hunan 410083 P. R. China
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- Junliang Yang
- Hunan Key Laboratory for Super Microstructure and Ultrafast Process School of Physics and Electronics Central South University Changsha Hunan 410083 P. R. China
説明
<jats:p>High‐performance organic heterojunction phototransistors are fabricated using highly ordered copper phthalocyanine (CuPc) and <jats:italic>para</jats:italic>‐sexiphenyl (<jats:italic>p</jats:italic>‐6P) thin films. The <jats:italic>p</jats:italic>‐6P thin film plays an important role on the performance of CuPc/<jats:italic>p</jats:italic>‐6P heterojunction phototransistors. It acts as a molecular template layer to induce the growth of highly ordered CuPc thin film, which dramatically improves the charge transport and decreases the grain boundaries. On the other hand, the <jats:italic>p</jats:italic>‐6P thin film can form an effective heterojunction with CuPc thin film, which is greatly helpful to enhance the light absorption and photogenerated carriers. Under 365 nm ultraviolet light irradiation, the ratio of photocurrent and dark current and photoresponsivity of CuPc/<jats:italic>p</jats:italic>‐6P heterojunction phototransistors reaches to about 2.2 × 10<jats:sup>4</jats:sup> and 4.3 × 10<jats:sup>2</jats:sup> A W<jats:sup>−1</jats:sup>, respectively, which are much larger than that of CuPc phototransistors of about 2.7 × 10<jats:sup>2</jats:sup> and 7.3 A W<jats:sup>−1</jats:sup>, respectively. A detailed study carried out with current sensing atomic force microscopy proves that the photocurrent is predominately produced inside the highly ordered CuPc/<jats:italic>p</jats:italic>‐6P heterojunction grains, while the photocurrent produced at the boundaries between grains can be neglected. The research provides a good method for fabricating high‐performance organic phototransistors using a combination of molecular template growth and organic heterojunction.</jats:p>
収録刊行物
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- Advanced Functional Materials
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Advanced Functional Materials 27 (6), 2016-12-27
Wiley
