Development of n-Type Small-Molecule Acceptors for Low Dark Current Density and Fast Response Organic Photodetectors

Kim, Hyeokjun; Kang, Jinhyeon; Kim, Myeong In; Jeong, WonJo; Baek, Seyeon; Ahn, Hyungju; Chung, Dae Sung; Jung, In Hwan

doi:10.1021/acsami.3c11174

Cited by 3 publications

(1 citation statement)

References 57 publications

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“…Among three small molecules, I-NPDI, including indacenodithiophene (IDT), showed better charge transport and suppressed J d characteristics. They exhibited R value of 0.231 A/W, low J d value of 5.92 × 10 -10 A/cm 2 and D* value of 8.09 × 10 12 Jones at -2 V bias [14] .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Benzobisoxazole-based Conjugated Polymers for Organic Photodetectors

Kim,

Jeong

2024

org. polym. mater. res.

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Benzo[1,2-d:4,5-d’]bis(oxazole) (BBO) is a conjugated building block that can be easily synthesized for the development of organic optoelectronic polymers. Here, the authors synthesized BBO-based polymers, P1 and P2, by coupling BBO with thiophenes for use in organic photodetectors (OPDs). The optical characteristics of P1 and P2 make them suitable for OPDs, as they selectively absorb the green light with a narrow bandwidth in the range of 500–600 nm. The OPD devices were fabricated by making a bulk heterojunction active layer between the synthesized polymers and a nonfullerene acceptor, IDIC. P1-based devices showed slightly higher responsivity (R) of 0.169 A/W than 0.112 A/W of P2-based devices. However, the P2-based device was higher than D* value of the P1-based under 100 μW/cm2, which was due to the influence of excessive thiophene units that had low dark current density.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Benzobisoxazole-based Conjugated Polymers for Organic Photodetectors

Kim,

Jeong

2024

org. polym. mater. res.

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Photo-crosslinking and layer-by-layer processed organic photodetectors with remarkably suppressed dark current

Hun Jee,

Park,

Young Lee

et al. 2024

Chemical Engineering Journal

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Improving the Active Layer Crystallization Process by Promoting Acceptor Aggregation for High-Performance Near-Infrared Organic Photodetectors

Lin,

Yan,

Yao

et al. 2024

ACS Appl. Energy Mater.

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Near-infrared organic photodetectors (NIR-OPDs) have been extensively employed in biomedicine, alcohol detection, and image sensing areas. The crystallization state of the active layer of NIR-OPDs has a significant impact on the performance of organic photodetectors in terms of detection. The combination of a polymer donor and a nonfullerene small molecule acceptor as an active layer has recently emerged as a promising approach in the field of NIR-OPDs for its favorable balance of stability and mutual solubility. However, this combination has been observed to exhibit suboptimal exciton dissociation and collection, as well as server trap-assisted complexation, due to its inherent challenges in crystallization. These limitations have been shown to impede the improvement of the external quantum efficiency (EQE) of the device. Furthermore, this combination increases the trap state density, which is unfavorable for dark current density (J D ) reduction. To address these issues, the crystallization process of the acceptors was enhanced by promoting the aggregation of nonfullerene small molecule acceptors using the liquid crystal small molecule BTR-Cl as a third component. Finally, the J D of the device is effectively suppressed from 5.04 × 10 −10 to 2.05 × 10 −10 A/cm 2 at −0.2 V. The EQE of the device is improved from 74.12% to 78.48% at 800 nm. The specific detection rate (D*) of 5.50 × 10 13 Jones is achieved at −0.2 V and 800 nm. Furthermore, the device is employed for the detection of heart rate and the real-time monitoring of the pulse. This study presents an effective method for enhancing the performance of NIR-OPDs and elucidates the impact of the active layer crystallization process on the performance of NIR-OPDs. This is of significant guiding value for the enhancement of the NIR-OPDs' performance.

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Development of n-Type Small-Molecule Acceptors for Low Dark Current Density and Fast Response Organic Photodetectors

Cited by 3 publications

References 57 publications

Synthesis and Characterization of Benzobisoxazole-based Conjugated Polymers for Organic Photodetectors

Synthesis and Characterization of Benzobisoxazole-based Conjugated Polymers for Organic Photodetectors

Photo-crosslinking and layer-by-layer processed organic photodetectors with remarkably suppressed dark current

Improving the Active Layer Crystallization Process by Promoting Acceptor Aggregation for High-Performance Near-Infrared Organic Photodetectors

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