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Nano Research 2021, 14(11): 4038-4045 https://doi.org/10.1007/s12274-021-3333-z
Research Article | Issue | Published: 22 February 2021

CsPbBr3 quantum dots photodetectors boosting carrier transport via molecular engineering strategy

Show Author's Information Wei Yan1,  Jianhua Shen1( ),  Yihua Zhu1( ),  Yiqing Gong1,  Jingrun Zhu1,  Zheng Wen2,  Chunzhong Li3( )
Shanghai Engineering Research Centre of Hierarchical NanomaterialsKey Laboratory for Ultrafine Materials of Ministry of EducationFrontiers Science Centre for Materiobiology and Dynamic ChemistrySchool of Materials Science and Engineering East China University of Science and TechnologyShanghai 200237 China
Institute of Functional Nano and Soft Materials (FUNSOM)Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Soochow UniversitySuzhou 215123 China
Shanghai Engineering Research Centre of Hierarchical NanomaterialsSchool of Chemical Engineering East China University of Science and TechnologyShanghai 200237 China
Keywords:
interface, photodetector, perovskite quantum dots, 3, molecular engineering, 4-ethylenedioxythiophene
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Yan W, Shen J, Zhu Y, et al. CsPbBr3 quantum dots photodetectors boosting carrier transport via molecular engineering strategy. Nano Research, 2021, 14(11): 4038-4045. https://doi.org/10.1007/s12274-021-3333-z
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Abstract Full text Electronic supplementary material About this article

Perovskite quantum dots (PQDs) require ligands on their surfaces to passivate defects and prevent aggregation. However, the ligands construct the interface relationship between the PQDs, which may seriously hinder the carrier transport. Hence, we propose a molecular engineering strategy of using 3, 4-ethylenedioxythiophene (EDOT) to perfectly solve this problem, benefiting from its high conjugation and passivation ability to CsPbBr3 PQDs. Furthermore, EDOT on the surface of PQDs can be in-situ polymerized under the photocurrent of the photodetector, thus interconnecting the PQDs which enhanced the performance of the photodetectors up to 178% of its initial performance. We have thoroughly investigated the electropolymerization process of EDOT and its passivation effect on PQDs. The simple lateral photodetector based on EDOT PQDs exhibits a high responsivity of 11.96 A/W, which is 104 times higher than that of oleic acid caped PQDs. Due to the protection of poly(3, 4-ethylenedioxythiophene) (PEDOT), the photodetector prepared from EDOT PQDs exhibited very high stability, retaining 94% of its performance after six months in air. This strategy provides a solution for the application of PQDs in high performances and stable optoelectronic devices.


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Electronic supplementary material
About this article

CsPbBr3 quantum dots photodetectors boosting carrier transport via molecular engineering strategy

Show Author's information Wei Yan1, Jianhua Shen1( ), Yihua Zhu1( ), Yiqing Gong1, Jingrun Zhu1, Zheng Wen2, Chunzhong Li3( )
Shanghai Engineering Research Centre of Hierarchical NanomaterialsKey Laboratory for Ultrafine Materials of Ministry of EducationFrontiers Science Centre for Materiobiology and Dynamic ChemistrySchool of Materials Science and Engineering East China University of Science and TechnologyShanghai 200237 China
Institute of Functional Nano and Soft Materials (FUNSOM)Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Soochow UniversitySuzhou 215123 China
Shanghai Engineering Research Centre of Hierarchical NanomaterialsSchool of Chemical Engineering East China University of Science and TechnologyShanghai 200237 China

Abstract

Perovskite quantum dots (PQDs) require ligands on their surfaces to passivate defects and prevent aggregation. However, the ligands construct the interface relationship between the PQDs, which may seriously hinder the carrier transport. Hence, we propose a molecular engineering strategy of using 3, 4-ethylenedioxythiophene (EDOT) to perfectly solve this problem, benefiting from its high conjugation and passivation ability to CsPbBr3 PQDs. Furthermore, EDOT on the surface of PQDs can be in-situ polymerized under the photocurrent of the photodetector, thus interconnecting the PQDs which enhanced the performance of the photodetectors up to 178% of its initial performance. We have thoroughly investigated the electropolymerization process of EDOT and its passivation effect on PQDs. The simple lateral photodetector based on EDOT PQDs exhibits a high responsivity of 11.96 A/W, which is 104 times higher than that of oleic acid caped PQDs. Due to the protection of poly(3, 4-ethylenedioxythiophene) (PEDOT), the photodetector prepared from EDOT PQDs exhibited very high stability, retaining 94% of its performance after six months in air. This strategy provides a solution for the application of PQDs in high performances and stable optoelectronic devices.

Keywords: interface, photodetector, perovskite quantum dots, 3, molecular engineering, 4-ethylenedioxythiophene

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Publication history
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Acknowledgements

Publication history

Received: 28 October 2020
Revised: 11 January 2021
Accepted: 14 January 2021
Published: 22 February 2021
Issue date: November 2021

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2021

Acknowledgements

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 21676093, 21776092, 21978087, 21838003, and 91834301), the Shanghai Scientific and Technological Innovation Project (Nos. 19JC1410400 and 18JC1410600), Shanghai Rising-Star Program (No. 18QA1401500), the Innovation Program of Shanghai Municipal Education Commission, Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutes of High Learning, Shanghai Rising-Star Program (No. 18QA1401500) and the Fundamental Research Funds for the Central Universities (No. 222201718002).

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