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Dive into the research topics where Congwu Ge is active.

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Featured researches published by Congwu Ge.


Polymer Chemistry | 2016

Incorporation of benzothiadiazole into the backbone of 1,2,5,6-naphthalenediimide based copolymers, enabling much improved film crystallinity and charge carrier mobility

Zheng Zhao; Zhongli Wang; Congwu Ge; Xu Zhang; Xiaodi Yang; Xike Gao

By incorporating benzothiadiazole units into the main chain of 1,2,5,6-naphthalenediimide (iso-NDI) and thiophene based copolymers, we report herein a new high performance donor–acceptor (D–A) polymer, P(iso-NDI-TBT), with much improved film crystallinity and charge carrier mobility. The optical, electrochemical, and charge transport properties as well as the photovoltaic performance were investigated. Bottom-gate bottom-contact organic field-effect transistors (OFETs) based on the thin films of P(iso-NDI-TBT) show a high hole mobility of up to 0.82 cm2 V−1 s−1, which is a record value for the 1,2,5,6-NDI based polymers. In addition, the photovoltaic performance of P(iso-NDI-TBT) was also studied, affording a power conversion efficiency (PCE) of 1.5% with a high open-circuit voltage (Voc) of 0.9 V. Our work provides important clues for designing high performance D–A polymeric semiconductors and also demonstrates that 1,2,5,6-NDIs are promising building blocks for constructing new polymer semiconductors.


Advanced Science | 2017

Furan Is Superior to Thiophene: A Furan-Cored AIEgen with Remarkable Chromism and OLED Performance

Zheng Zhao; Han Nie; Congwu Ge; Yuanjing Cai; Yu Xiong; Ji Qi; Wenting Wu; Ryan T. K. Kwok; Xike Gao; Anjun Qin; Jacky Wing Yip Lam; Ben Zhong Tang

Furan‐cored AIEgen namely tetraphenylethylene‐furan (TPE‐F) is developed by diyne cyclization and its fluorescent and chemical properties are investigated and compared with its thiophene analogue. Results show that furan is superior to thiophene in terms of fluorescence, chromism, and charge transport. The mechanism of chromism of TPE‐F is investigated and its efficient solid‐state photoluminescence and good charge‐transporting property enable it to serve as light‐emitting material for the construction of electroluminescence devices with excellent performance. This work not only demonstrates an efficient strategy for constructing furan‐cored AIEgens but also indicates that they are promising as advanced optoelectronic materials.


Angewandte Chemie | 2018

Incorporation of 2,6-Connected Azulene Units into the Backbone of Conjugated Polymers: Towards High-Performance Organic Optoelectronic Materials

Hanshen Xin; Congwu Ge; Xuechen Jiao; Xiaodi Yang; Kira Rundel; Christopher R. McNeill; Xike Gao

Azulene is a promising candidate for constructing optoelectronic materials. An effective strategy is presented to obtain high-performance conjugated polymers by incorporating 2,6-connected azulene units into the polymeric backbone, and two conjugated copolymers P(TBAzDI-TPD) and P(TBAzDI-TFB) were designed and synthesized based on this strategy. They are the first two examples for 2,6-connected azulene-based conjugated polymers and exhibit unipolar n-type transistor performance with an electron mobility of up to 0.42 cm2  V-1  s-1 , which is among the highest values for n-type polymeric semiconductors in bottom-gate top-contact organic field-effect transistors. Preliminary all-polymer solar cell devices with P(TBAzDI-TPD) as the electron acceptor and PTB7-Th as the electron donor display a power conversion efficiency of 1.82 %.


Organic Letters | 2017

A Class of Electron-Transporting Vinylogous Tetrathiafulvalenes Constructed by the Dimerization of Core-Expanded Naphthalenediimides

Yunbin Hu; Zhongli Wang; Xu Zhang; Xiaodi Yang; Congwu Ge; Lina Fu; Xike Gao

The combination of the (1,3-dithiol-2-ylidene)malononitrile (DTYM) and/or (1,3-dithiol-2-ylidene)acetonitrile (DTYA) moieties with naphthalenediimide (NDI) core affords two singly linked NDI-based dimers, (DTYM-NDI-DTYA)2 (D1) and (NDI-DTYA)2 (D2), which both contain a dicyano-substituted vinylogous tetrathiafulvalene (TTF) unit. The synthesis, thermal/optical/electrochemical properties of D1 and D2, and their primary applications in n-channel organic thin film transistors are studied. The results demonstrate that these NDI-fused vinylogous TTFs are excellent electron acceptors, and their further applications are promising.


Materials Chemistry Frontiers | 2018

6,6′-Diaryl-substituted biazulene diimides for solution-processable high-performance n-type organic semiconductors

Hanshen Xin; Jing Li; Congwu Ge; Xiaodi Yang; Tianrui Xue; Xike Gao

Azulene, a non-benzenoid aromatic hydrocarbon, is a promising building block for constructing organic optoelectronic materials. Herein, a series of 6,6′-diaryl-substituted biazulene diimides (1–5) are designed and synthesized for solution-processable organic semiconductors. These compounds exhibited excellent electron transport properties with fine-tuned molecular energy levels (HOMO: −5.68 to −6.04 eV; LUMO: −3.63 to −3.73 eV). Bottom-gate-top-contact organic field effect transistors (OFETs) based on compounds 1–3 and 5 displayed unipolar n-type semiconducting properties with optimized average electron mobilities of 0.12–0.45 cm2 V−1 s−1, of which the devices based on 2 demonstrated an electron mobility of up to 0.52 cm2 V−1 s−1, the highest electron mobilities for azulene-based organic semiconductors and also among the highest values for solution-processable n-channel OFETs. Devices based on 4 showed ambipolar FET performance with electron and hole mobilities of 0.31 cm2 V−1 s−1 and 0.029 cm2 V−1 s−1, respectively. The ambipolar charge transport behavior of 4 is due to its higher HOMO energy level (−5.68 eV) than the others (−5.78 to −6.04 eV). The excellent electron transport ability of compounds 1–5 might be attributed to the dense molecular packing induced by the dipolar moment of the azulene units as revealed by single crystal analysis. Besides, compounds 2 and 5 were used as electron acceptors for organic photovoltaic devices, and an average power conversion efficiency of about 1.3% was obtained for their respective blend thin films with electron donor PTB7-Th. The results demonstrate that 6,6′-diaryl-substituted biazulene diimides are promising solution-processable n-type organic semiconductors, and the azulene unit has great potential for constructing excellent organic optoelectronic materials.


Materials Chemistry Frontiers | 2017

Dithieno[3,2-a:3′,2′-j][5,6,11,12]chrysene diimides and their molecular energy level regulation

Xueqian Zhao; Congwu Ge; Xiaodi Yang; Xike Gao

Dithieno[3,2-a:3′,2′-j][5,6,11,12]chrysene diimides (DTCDIs), a new class of organic dyes, with a twisted molecular backbone were designed and synthesized. The optical and electrochemical properties, charge transport behaviors and the single crystal structure were investigated. The cyanation of the DTCDI backbone was carried out to fine-tune the molecular energy levels. The addition of two cyano groups to the DTCDI backbone reduced the HOMO and LUMO energy levels by 0.35 and 0.30 eV, respectively. The energy levels could be further reduced with the addition of two more cyano groups leading to 0.32 and 0.22 eV reductions in HOMO and LUMO energy levels and stabilization of the energy levels. A tetracyano-substituted DTCDI derivative showed an electron mobility of 0.25 cm2 V−1 s−1 and a current on/off ratio of 106 in its organic thin film transistors.


Chinese Journal of Polymer Science | 2017

1,2,5,6-Naphthalenediimide-based conjugated copolymers linked by ethynyl units

Bing-yong Liu; Xiaochun Yang; Congwu Ge; Jianmin Dou; Dacheng Li; Xike Gao

Two copolymers of P1 and P2 comprising benzothiadiazole, 1,4-bis(dodecyloxy)-benzene units were synthesized by Sonogashira coupling polymerization based on ethynyl-linked 1,2,5,6-naphthalenediimide. Their thermal, optical, electrochemical as well as charge transport properties were studied. Bottom-gate top-contact organic field-effect transistors (OFETs) measurements of P1 and P2 thin films showed different charge transport behaviors. P1 displayed pure electron transport behaviors in OFETs with electron mobility up to 10−3 cm2·V−1·s−1, while P2 exhibited hole transport features. The molecular structure analysis revealed that the structure of P1 has the acceptor-linker-acceptor′ (A-L-A′) characteristic, and P2 possesses the donor-linker-acceptor (D-L-A) structure feature. The results demonstrate that different molecular structures lead them to have distinct charge transport behaviors. In particular, the first pure electron transport copolymer in OFETs based on 1,2,5,6-naphthalenediimide is achieved.


Chemical Science | 2016

Biazulene diimides: a new building block for organic electronic materials

Hanshen Xin; Congwu Ge; Xiaodi Yang; Honglei Gao; Xiaochun Yang; Xike Gao


Tetrahedron Letters | 2017

Application of direct (hetero)arylation in constructing conjugated small molecules and polymers for organic optoelectronic devices

Wenting Wu; Hanshen Xin; Congwu Ge; Xike Gao


Advanced Functional Materials | 2017

An Amidine-Type n-Dopant for Solution-Processed Field-Effect Transistors and Perovskite Solar Cells

Lin Hu; Tiefeng Liu; Jiashun Duan; Xiaoyi Ma; Congwu Ge; Youyu Jiang; Fei Qin; Sixing Xiong; Fangyuan Jiang; Bin Hu; Xike Gao; Yuanping Yi; Yinhua Zhou

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Xike Gao

Chinese Academy of Sciences

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Hanshen Xin

Chinese Academy of Sciences

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Wenting Wu

Chinese Academy of Sciences

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Xiaochun Yang

Chinese Academy of Sciences

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Jing Li

Chinese Academy of Sciences

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Lin Hu

Huazhong University of Science and Technology

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Yinhua Zhou

Huazhong University of Science and Technology

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Yonghui Hu

Chinese Academy of Sciences

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