Improving the photocurrent of a PBDTTT-CF and PCBM based organic thin film photoconductor by forming a bilayer structure

Jin, Zhiwen; Qing, Zhou; Mao, Peng; Wang, Aiji; Shang, B.Y.; Wang, Yinshu; Li, Hui; Wang, Jizheng

doi:10.1039/c5ra16998d

Cited by 5 publications

(2 citation statements)

References 34 publications

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“…Meanwhile, the doping of PCBM would improve the electron mobility, thereby balancing the carrier transport and increasing the response speed. Jin et al blended poly[4,8‐bis‐substituted‐benzo[1,2‐b:4,5‐b′] dithiophene‐2,6‐diyl‐ alt ‐4‐substituted‐thieno[3,4‐b]thiophene‐2,6‐diyl]‐fluorine (PBDTTT‐CF) and PCBM to obtain a donor:acceptor active layer of a photoconductor . By using PBDTTT‐CF as the photogenerated carrier‐transporting layer and forming a PBDTTT‐CF/PBDTTT‐CF:PCBM bilayer structure, I p could be enhanced significantly compared with the blend and pristine PBDTTT‐CF and PCBM devices due to the efficient carrier generation and transportation.…”

Section: Performance Improvement Strategiesmentioning

confidence: 99%

Strategies toward High‐Performance Solution‐Processed Lateral Photodetectors

Lin

Wang

2019

Advanced Materials

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Since the device performance mainly depends on the active materials and device architectures, they are the subject of extensive work, and there have been many achievements. Dispersible inorganic materials vastly simplify the preparation of films while maintaining good electrical conductivity; [1][2][3][4][5] organic small-molecule materials and polymer materials have wide wavelength response, especially in visible region, and can be adjusted easily by changing the functional groups; [6][7][8][9][10] organic-inorganic hybrid material systems are also a promising development direction, combining good electrical and optical properties; [11][12][13][14][15] in addition, the perovskite series of organic-inorganic hybrid materials has become a new research direction due to their excellent optoelectronic properties. [16][17][18][19][20] In addition, varieties of microstructures including nanoparticles, nanowires, nanosheets etc., have been widely investigated, and they have a wide range of applications in devices benefiting from their peculiar characteristics, like quantum size effect and anisotropy. [21][22][23][24][25] Besides working on active materials, constructing diverse device architectures is also a convenient and effective approach. [26][27][28][29][30] The fabrication of blend, bilayer, and multilayer architectures would be conducive to increasing responsivity, extending detection range, and accelerating response speed.Here, from active materials to device architectures, we systematically introduce and discuss the strategies for improving the device performance of solution-processed lateral PDs. To begin with, we briefly expound the working mechanism of the lateral PDs and clarify the key device figures-of-merit. Then, based on the active materials, we divide the devices into four categories: inorganic, organic, hybrid, and perovskite, and their corresponding improvement methods are summarized respectively. To close, we conduct a physical generalization and propose detailed suggestions for the further development of the field. Device Working PrincipleThe structures of lateral PDs are quite simple: an active layer between two parallel electrodes or using three electrodes (source, drain, and gate) for better control; and the detection of light mainly originates from the change of conductivity, which is caused by the increase of the carrier concentration under illumination.Due to their low cost and ease of integration, solution-processed lateral photodetectors (PDs) are becoming an important device type among the PD family. In recent years, enormous effort has been devoted to improving their performances, and great achievements have been made. A summary of the core progress, especially from the perspective of design principles and device physics, is necessary to further the development of the field, but is currently lacking. Here, to address this need, first, the working mechanism of PDs and the device figures-of-merit are introduced. Second, by classifying the active materials into four categories, including in...

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Section: Performance Improvement Strategiesmentioning

confidence: 99%

Strategies toward High‐Performance Solution‐Processed Lateral Photodetectors

Lin

Wang

2019

Advanced Materials

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“…However, the carrier mobility of the blend structure PTB7-Th:IEICO-4F is relatively low, which leads to carrier recombination before being collected by the graphene channel. 42 Thus, we restrict the thickness of the active blend heterojunction to a 35 nm scale for facilitating the photo-response. The control device without a ZnO layer still exhibits inferior performance, as shown in Fig.…”

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confidence: 99%

Near-infrared heterojunction field modulated phototransistors with distinct photodetection/photostorage switching features for artificial visuals

Han

Zhang

et al. 2022

J. Mater. Chem. C

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Hybrid Organic/PbS Quantum Dot Bilayer Photodetector with Low Dark Current and High Detectivity

Wei

Ren

Zhang

et al. 2018

Adv Funct Materials

159

135

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Owing to their ease of fabrication, low cost, and high flexibility, organic materials have attracted great interests in photodetector (PD) applications. However, suffering from large dark current, small photocurrent, low on–off ratio, and low sensitivity, performances of bare organic‐based PDs are not satisfactory. Integrating organic materials with other novel semiconductor materials offers an opportunity to overcome these drawbacks. Here, a lateral hybrid organic/lead sulfide (PbS) quantum dot bilayer PD is designed and fabricated, which significantly suppresses the dark current and enhances the photocurrent, leading to improved light detecting capability. Meanwhile, the bilayer PD can be made on a flexible polyimide substrate.

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Improving the photocurrent of a PBDTTT-CF and PCBM based organic thin film photoconductor by forming a bilayer structure

Abstract: By controlling and adjusting the fabrication process, all-solution-processed bilayer OTFPs exhibits a faster carrier transport which greatly enhanced the photocurrent.

Cited by 5 publications

References 34 publications

Strategies toward High‐Performance Solution‐Processed Lateral Photodetectors

Strategies toward High‐Performance Solution‐Processed Lateral Photodetectors

Near-infrared heterojunction field modulated phototransistors with distinct photodetection/photostorage switching features for artificial visuals

Hybrid Organic/PbS Quantum Dot Bilayer Photodetector with Low Dark Current and High Detectivity

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