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6. The Impact of Benzothiadiazole on the Optoelectronic Performance of Polymer/PC71BM Blend Films and Their Application in NIR Phototransistors.

Author

Ma, Lanchao, Li, Zhengang, Chen, Bing, Xue, Peiyao, Wang, Zemin, Wu, Yibo, Zhan, Xiaowei, Liu, Yunqi, and Chen, Xingguo

Subjects
ORGANIC field-effect transistors, PHOTOTRANSISTORS, CONJUGATED polymers, SCANNING force microscopy, POLYMER blends, THIN films, SCANNING electron microscopy
Abstract

D‐A conjugated polymers P1 and P2 are synthesized by copolymerizing bisthiophene‐fused diketopyrrolopyrrole (4,11‐bis(2‐decyltetradecyl)‐7H,14H‐thieno[3',2':7,8]‐indolizino[2,1‐a]thieno[3,2‐g]indolizine‐7,14‐dione, BTI) with terthiophene and thiophene‐benzothiadiazole‐thiophene, respectively. Molecular packing is characterized by X‐ray diffraction. The film morphology is characterized by atomic force and scanning electron microscopy. The vertical phase separation is characterized by XPS. The mechanism of film morphology formation is explained from intermolecular interaction, kinetics, and surface free energy. The spin‐coated films of polymers blended with PC71BM are served as semiconductor layers in near‐infrared (NIR) phototransistors. The impact of morphology on optoelectronic performance is analyzed. The mobility of organic field effect transistors based on P1 or P2 thin films remains constant with the addition of PC71BM with weight ratio being less than 50%. The main reason is that π–π stacking in both P1 and P2 thin films is at all directions and PC71BM does not disturb the charge percolation path. Benzothiadiazole in P2 enables stronger mutual attraction between P2 and PC71BM, and therefore large contact area between P2 and PC71BM forms in the heterojunction. The photoresponsivity improves by 2 times for NIR phototransistors based on P2/PC71BM when decreasing light intensity from 63 to 1.8 µW cm‐2. The above results suggest a feasible conjugated polymer design rule for high sensitivity NIR phototransistors. [ABSTRACT FROM AUTHOR]

Published
2022
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13. NIR polymers and phototransistors

Author

Ma, Lanchao, primary, Chen, Bing, additional, Guo, Yunlong, additional, Liang, Yongri, additional, Zeng, Dongmei, additional, Zhan, Xiaowei, additional, Liu, Yunqi, additional, and Chen, Xingguo, additional

Published
2018
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30. Small-Molecule Solar Cells with Fill Factors up to 0.75 via a Layer-by-Layer Solution Process.

Author

Lin, Yuze, Ma, Lanchao, Li, Yongfang, Liu, Yunqi, Zhu, Daoben, and Zhan, Xiaowei

Subjects
*SEMICONDUCTORS, *SOLAR cells, *PHOTOVOLTAIC cells, *MOLECULES, *SOLUBILITY
Abstract

An oligothiophene‐based molecule (BDT‐3T‐CA) using a molecular engineering approach is applied to solution‐processed layer‐by‐layer solar cells. The solar cells based on BDT‐3T‐CA/PC61BM (a fullerene derivative) exhibit power conversion efficiency (PCE) values as high as 4.16% and fill factor (FF) values up to 0.75. The FF of 0.75 is the highest value reported for solution processed small molecule solar cells. [ABSTRACT FROM AUTHOR]

Published
2014
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31. Effect of the Longer β-UnsubstitutedOliogothiophene Unit (6T and 7T) on the Organic Thin-Film TransistorPerformances of Diketopyrrolopyrrole-Oliogothiophene Copolymers.

Author

Yi, Zhengran, Ma, Lanchao, Chen, Bing, Chen, Dugang, Chen, Xingguo, Qin, Jingui, Zhan, Xiaowei, Liu, Yunqi, Ong, Wen Jie, and Li, Jun

Subjects
*PERFORMANCE of thin film transistors, *THIOPHENES, *ORGANIC thin films, *PYRROLES, *COPOLYMERS, *POLYMERIZATION, *COUPLING reactions (Chemistry)
Abstract

Two new diketopyrrolopyrrole-basedπ-conjugated copolymers(PDPP6T and PDPP7T) have been synthesized by Stille coupling polymerizationof 3,6-bis(5′-bromo-[2,2′-bithiophen]-5-yl)-2,5-bis(2-octyldodecyl)pyrrolo-[3,4-c]pyrrole-1,4(2H,5H)-dionewith α,α′-bis(trimethylstannyl)-bithiophene andα,α′-bis(trimethylstannyl)-terthiophene, respectively.The impressive high mobility of 3.94 cm2V–1s–1for the polymer with sextetthiophene (6T)and of 2.82 cm2V–1s–1for polymer with septetthiophene (7T) is acquired. It is found thatthe introduction of longer β-unsubstituted oliogothiophene unitin DPP-based copolymers has a great influence on the molecular weightand solubility of the DPP-oligothiophene copolymers that finally affectsthe organic thin-film transistor (OTFT) performances, indicating thata suitable number of thiophene group in β-unsubstituted oligothiopheneexists for such a kind of copolymer to exhibit the best OTFT performances.This work also reveals the significance in the design of D–Acopolymers for OTFTs through regulating the balance between π–πstacking of intermolecular chains and molecular weight as well assolubility of the rigid main chain. [ABSTRACT FROM AUTHOR]

Published
2013
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