Architecturally simple organic photodiodes with highly competitive figures of merit <i>via</i> a facile self-assembly strategy

Chandran, Hrisheekesh Thachoth; Tang, Hua; Liu, Taili; Mahadevan, Sudhi; Liu, Kuan; Lu, Zhen; Huang, Jiaming; Z, Ren; Liao, Fuyou; Chai, Yang; Fong, W.K.; Tsang, Sai‐Wing; Lu, Shirong; Li, Gang

doi:10.1039/d2mh01164f

Cited by 6 publications

(4 citation statements)

References 62 publications

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“…These performances are comparable to the chlorinated-solvent-processed and green-solventprocessed OPDs reported in the literature (Figure S15 and Table S2). 28,50 This study demonstrates that green-solventprocessed OPDs have great potential as high-performance alternatives to those processed with toxic chlorinated solvents, without sacrificing excellent photosensing capabilities.…”

Section: ■ Conclusionmentioning

confidence: 81%

“…Du et al systematically studied a fullerene acceptor-based bulk BHJ organic solar cell to understand the origin of the superior performance of the o -xylene-processed devices compared to the CB-processed counterparts . However, reports of green-solvent-processed OPDs have rarely been seen in the literature. , Using a PD-940 ink formula dissolved in o -xylene, Wu et al realized top-illuminated OPDs with photoresponse beyond λ = 1000 nm and specific detectivity close to 10 13 Jones . However, the chemical structures of the components in this ink remain undisclosed.…”

Section: Introductionmentioning

confidence: 99%

“…However, the chemical structures of the components in this ink remain undisclosed. In another report, Chandran et al employed a self-assembled hole-blocking layer Phen-NaDPO and a BHJ of PM6:BTP-eC9 processed by o -xylene, successfully realizing a fast response time of <2 μs and high responsivity of ∼0.5 A/W at λ = 900 nm . However, the dark current density is above 20 nA/cm 2 at −0.1 V; as a consequence, the specific detectivity remains lower than 10 12 Jones at the peak of λ = 900 nm.…”

Section: Introductionmentioning

confidence: 99%

“…49 However, reports of green-solvent-processed OPDs have rarely been seen in the literature. 28,50 Using a PD-940 ink formula dissolved in oxylene, Wu et al realized top-illuminated OPDs with photoresponse beyond λ = 1000 nm and specific detectivity close to 10 13 Jones. 28 However, the chemical structures of the components in this ink remain undisclosed.…”

Section: ■ Introductionmentioning

confidence: 99%

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Green-Solvent-Processed High-Performance Broadband Organic Photodetectors

Huang,

Luong,

Lee

et al. 2023

ACS Appl. Mater. Interfaces

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Solution-processed organic photodetectors with broadband activity have been demonstrated with an environmentally benign solvent, ortho-xylene (o-xylene), as the processing solvent. The organic photodetectors employ a wide band gap polymer donor PBDB-T and a narrow band gap small-molecule non-fullerene acceptor CO1-4F, both dissolvable in o-xylene at a controlled temperature. The o-xylene-processed devices have shown external quantum efficiency of up to 70%, surpassing the counterpart processed with chlorobenzene. With a well-suppressed dark current, the device can also present a high specific detectivity of over 1012 Jones at −2 V within practical operation frequencies and is applicable for photoplethysmography with its fast response. These results further highlight the potential of green-solvent-processed organic photodetectors as a high-performing alternative to their counterparts processed in toxic chlorinated solvents without compromising the excellent photosensing performance.

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Section: ■ Conclusionmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Green-Solvent-Processed High-Performance Broadband Organic Photodetectors

Huang,

Luong,

Lee

et al. 2023

ACS Appl. Mater. Interfaces

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High‐Detectivity All‐Polymer Photodiode Empowers Smart Vitality Surveillance and Computational Imaging Rivaling Silicon Diodes

Chandran,

Ma,

et al. 2024

Advanced Materials

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Near‐infrared (NIR) organic photodetectors (OPDs), particularly all‐polymer‐based ones, hold substantial commercial promise in the healthcare and imaging sectors. However, the process of optimizing their active layer composition to achieve highly competitive figures of merit lacks a clear direction and methodology. In this work, celebrity polymer acceptor PY‐IT into a more NIR absorbing host system PBDB‐T:PZF‐V, to significantly enhance the photodetection competence, is introduced. The refined all‐polymer ternary broadband photodetector demonstrates superior performance metrics, including experimentally measured noise current as low as 6 fA Hz−1/2, specific detectivity reaching 8 × 1012 Jones, linear dynamic range (LDR) of 145 dB, and swift response speed surpassing 200 kHz, striking a fair balance between sensitivity and response speed. Comprehensive morphological and photophysical characterizations elucidate the mechanisms behind the observed performance enhancements in this study, which include reduced trap density, enhanced charge transport, diminished charge recombination, and balanced electron/hole mobilities. Moreover, the practical deployment potential of the proof‐of‐concept device in self‐powered mode is demonstrated through their application in a machine learning‐based cuffless blood pressure (BP) estimation system and in high‐resolution computational imaging across complex environments, where they are found to quantitatively rival commercial silicon diodes.

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High‐Performance Self‐Filtering Organic Photodetectors with Photomultiplication Narrowing

Suthar,

Chu,

Chen

2024

Advanced Optical Materials

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Narrowband organic photodetectors (OPDs) conventionally necessitate high applied biases to accommodate a sufficiently thick active layer for self‐filtering functions. Herein, a concept leveraging the photomultiplication (PM) process is proposed to achieve spectral narrowing in OPDs which can operate at low external biases. This PM narrowing mechanism integrates two distinct functions through a pseudo bilayer structure comprising a photon‐filtering (PF) layer and a PM layer, respectively. The initial PF layer absorbs short‐wavelength photons and selectively permits light within a narrow bandwidth at the band edge of the PF material to enter the subsequent PM layer, thereby initiating the PM effect. The combined action of these two layers synergistically empowers the OPDs to exhibit a pronounced PM effect, resulting in a notably high external quantum efficiency of 5840% at a narrowband peak of 680 nm under a low bias of −5.0 V. Furthermore, the OPDs achieve a substantial −3 dB bandwidth of 5.2 kHz, alongside a maximum detectivity of 2.60 × 1013 Jones. These findings position the OPDs among the top‐performing self‐filtering narrowband detectors, particularly for those capable of functioning at low external biases.

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Architecturally simple organic photodiodes with highly competitive figures of merit via a facile self-assembly strategy

Abstract: Photodetectors (PDs) based on organic materials exhibit potential advantages such as low-temperature processing, superior mechanical properties, and form factors. They have seen rapid strides towards achieving performance metrics comparable to...

Cited by 6 publications

References 62 publications

Green-Solvent-Processed High-Performance Broadband Organic Photodetectors

Green-Solvent-Processed High-Performance Broadband Organic Photodetectors

High‐Detectivity All‐Polymer Photodiode Empowers Smart Vitality Surveillance and Computational Imaging Rivaling Silicon Diodes

High‐Performance Self‐Filtering Organic Photodetectors with Photomultiplication Narrowing

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