Structure design and performance of photomultiplication-type organic photodetectors based on an aggregation-induced emission material

Guo, Dechao; Xu, Zheng; Yang, Dezhi; Ma, Dongge; Tang, Ben Zhong; Agafonov, Vadim M.

doi:10.1039/c9nr09386a

Cited by 37 publications

(26 citation statements)

References 52 publications

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“…[35,52] The difference between J L and J d is the photogenerated current density (J ph ) for PD-OPDs, or photo-induced current density (J pi ) for PM-OPDs, which mainly originates from charge tunneling injection. [18,19,53]…”

Section: Dark Current Density and Light Current Densitymentioning

confidence: 99%

“…Besides introducing traps into active layer and interfacial layer, employing the interfacial charge blocking layer can also lead to PM phenomenon in OPDs. [36,53,[113][114][115][116] Hammond et al reported high photocurrent multiplication in broadband OPDs through tailored charge blocking layers. [113] Figure 10a illustrates the device structure of the PM-OPDs, which structured as ITO/naphthalenetetracarboxylic dianhydride (NTCDA)/C 60 /copper phthalocyanine (CuPc):C 60 (3:7, wt/wt)/BCP/Al.…”

Section: Charge Blocking Layers Based Broadband Pm-opdsmentioning

confidence: 99%

“…In some previous works, the D * is commonly overestimated only by the shot noise and/or thermal noise because the shot and thermal noises are smaller than the measured noise. [ 53,55 ]…”

Section: Fundamentals Of Organic Photodetectorsmentioning

confidence: 99%

“…Besides introducing traps into active layer and interfacial layer, employing the interfacial charge blocking layer can also lead to PM phenomenon in OPDs. [ 36,53,113–116 ] Hammond et al. reported high photocurrent multiplication in broadband OPDs through tailored charge blocking layers.…”

Section: Broadband Photomultiplication Type Organic Photodetectorsmentioning

confidence: 99%

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Recent Progress on Broadband Organic Photodetectors and their Applications

Zhao

Niu

et al. 2020

Laser & Photonics Reviews

204

158

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As a promising candidate for next-generation photodetectors, organic photodetectors (OPDs) outperform the commercial inorganic photodetectors in terms of solution and large-area processability, mechanical flexibility, tunable spectral response range, low-cost manufacturing, and light weight. The OPDs with broadband spectral response attract an extensive attention due to their potential in wide application fields, such as flexible image sensing, surveillance, and health monitoring. In this review, recent advances in broadband OPDs are summarized as two sections: i) Photodiode type OPDs (PD-OPDs) based on thick-film strategy, ternary strategy, interfacial engineering, and multilayered strategy. ii) Photomultiplication type OPDs (PM-OPDs) with traps in active layer, traps in interfacial layer, and charge blocking layer. Some real applications on image sensors and photoplethysmography (PPG) sensors are also introduced on the basis of broadband OPDs. New insights on developing the broadband OPDs are put forward for improvement of broadband OPDs.

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Section: Dark Current Density and Light Current Densitymentioning

confidence: 99%

Section: Charge Blocking Layers Based Broadband Pm-opdsmentioning

confidence: 99%

“…In some previous works, the D * is commonly overestimated only by the shot noise and/or thermal noise because the shot and thermal noises are smaller than the measured noise. [ 53,55 ]…”

Section: Fundamentals Of Organic Photodetectorsmentioning

confidence: 99%

Section: Broadband Photomultiplication Type Organic Photodetectorsmentioning

confidence: 99%

See 2 more Smart Citations

Recent Progress on Broadband Organic Photodetectors and their Applications

Zhao

Niu

et al. 2020

Laser & Photonics Reviews

204

158

View full text Add to dashboard Cite

show abstract

“…[6][7][8][9][10][11][12] Among these, photomultiplication-type OPDs (PM-OPDs) are receiving increasing attention due to their exceptionally high external quantum efficiency (EQE). [13][14][15][16][17][18] Photomultiplication is an extrinsic photocurrent amplification mechanism in which trapped charge carriers (e.g., electrons) can induce the injection of the counter charge carriers (e.g., holes) by tunneling from the external circuit, which differs from the intrinsic multiexciton generation mechanism. [19] Specifically, when slower charge carriers (e.g., electrons) are trapped in the photoactive layer, the counter charge carriers (e.g., holes) can continuously circulate the circuit until the circulating carriers are recombined with the trapped carriers.…”

Section: Introductionmentioning

confidence: 99%

End‐Group Functionalization of Non‐Fullerene Acceptors for High External Quantum Efficiency over 150 000% in Photomultiplication Type Organic Photodetectors

Yoon

Lee

Sim

et al. 2020

Adv Funct Materials

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Photomultiplication‐type organic photodetectors (PM‐OPDs) with high external quantum efficiency (EQE) of over 100% are attracting increasing attention due to their potential importance in detecting weak incident light. Considering that the gain of PM‐OPD is determined by the ratio of carrier lifetime over carrier transit time, a systematic study on the effect of the end‐functionalization of a new extended aromatic fused‐ring non‐fullerene acceptor (NFA) on the carrier trap/transit time of the PM‐OPD. Photophysical analyses by means of ultraviolet‐visible absorption, ultraviolet photoelectron spectroscopy, and photoluminescence combined with structural analyses through grazing‐incidence wide‐angle X‐ray scattering show that fluorination of the NFA with the deepest lowest unoccupied molecular orbital level and non‐isotropic molecular ordering can yield the longest carrier lifetime. Furthermore, surface energy study show that fluorination of the NFA can also yield the most hydrophobic nature, which can allow the most efficient injection barrier thinning/lowering of the active layer/cathode interface under illumination due to the localized acceptor distribution toward cathode, maximizing the hole injection efficiency from cathode. As a result, an unprecedentedly high EQE of 156 000% is obtained from the optimized PM‐OPD. This work shows the importance of the molecular design of acceptor molecules in fabricating high‐performance PM‐OPDs.

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Low‐Cost Copper Electrode for High‐Performance Panchromatic Multiplication‐Type Organic Photodetectors with Optical Microcavity Effect

Yang

Guo

et al. 2022

Adv Funct Materials

Self Cite

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Low-cost and flexible panchromatic organic photodetectors (OPDs) are one of the most promising alternatives in next-generation wearable electronics, but they still face the formidable challenges of replacing brittle indium tin oxide electrode and suffer from low near-infrared (NIR) photo-response. Herein, the low-cost metal copper (Cu) is used as a semi-transparent anode to fabricate high-performance panchromatic multiplication-type OPDs. Because of the advantages of smooth surface, lower sheet resistance, and good transmittance, high-quality optical resonant cavity forming between Cu anode and aluminum cathode greatly enhanced the weak sub-bandgap response of intermolecular charge transfer states in NIR region, while also retaining a good response in the UV-vis region. Due to the good hole-collecting ability, the Cu electrode is suitable for realizing the photo-multiplication effect. Accordingly, the resulting OPDs achieve a panchromatic response ranging from the UV (300 nm) to NIR (900 nm) region. The maximum external quantum efficiency (EQE) reaches 117 040% at 350 nm, and the relatively high EQE of 25 468% is realized even at 765 nm. Furthermore, a flexible OPD is successfully fabricated by using polyethylene terephthalate substrate with Cu anode to achieve the real-time detection of human blood oxygen pulse signals.

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Structure design and performance of photomultiplication-type organic photodetectors based on an aggregation-induced emission material

Abstract: High performance photomultiplication-type organic photodetectors based on an AIE material were successfully fabricated by designing a device structure.

Cited by 37 publications

References 52 publications

Recent Progress on Broadband Organic Photodetectors and their Applications

Recent Progress on Broadband Organic Photodetectors and their Applications

End‐Group Functionalization of Non‐Fullerene Acceptors for High External Quantum Efficiency over 150 000% in Photomultiplication Type Organic Photodetectors

Low‐Cost Copper Electrode for High‐Performance Panchromatic Multiplication‐Type Organic Photodetectors with Optical Microcavity Effect

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