High‐Performing Acid‐Free PEDOT:PSS‐Based Organic Photodiodes for Cardiovascular Disease Diagnosis

Yang, Zhao; Kim, Byung Gi; Jang, Woongsik; Park, Jong Hyeok; Wang, Dong Hwan

doi:10.1002/adfm.202309271

Cited by 8 publications

(5 citation statements)

References 103 publications

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“…The two distinctive peaks representing the systolic and diastolic phases of the cardiac cycle are clearly visible. 8,45,46 This observation suggests the potential of this PPG sensor for obtaining operational status information of the heart through in-depth analysis of additional biometric features. 8,45,46 This outcome demonstrates the feasibility of employing the proposed optimised optical micro-cavity OPDs in practical applications.…”

Section: Resultsmentioning

confidence: 87%

“…N trap is calculated as follows: 8,40 where ε , ε 0 , and d denote the dielectric constant, permittivity of free space in vacuum, and film thickness, respectively. Trap-filled limit voltage ( V TFL ) is the voltage at which the trap states in the active layer are filled with carriers.…”

Section: Resultsmentioning

confidence: 99%

“…A PPG device is an instrument employed to monitor changes in blood volume in response to heartbeats, and is extensively used to monitor heart rate and assess blood oxygen levels in the body. 8,44,45 We utilised the experimental setup shown in Fig. 5g for the PPG measurements.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, researchers are turning to OPDs in pursuit of pioneering next-generation applications. 6–8…”

Section: Introductionmentioning

confidence: 99%

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Efficient noise suppression via controlling the optical cavity in near-infrared organic photoplethysmography sensors

Yang,

Kim,

Jang

et al. 2024

J. Mater. Chem. C

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Section: Resultsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…Therefore, researchers are turning to OPDs in pursuit of pioneering next-generation applications. 6–8…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Efficient noise suppression via controlling the optical cavity in near-infrared organic photoplethysmography sensors

Yang,

Kim,

Jang

et al. 2024

J. Mater. Chem. C

Self Cite

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“…Organic photodetectors (OPDs) have attracted significant interest from both academia and industry due to their excellent optoelectronic performance, solution processability, tunable response range, and large-area fabrication. − With the development of optoelectronics technology, OPDs have broad application in fields such as biomedical imaging, optical communications, and environmental monitoring. − One of the most significant advantages of OPDs is their synthetic flexibility, which allows for the preparation of different p/n-type organic semiconductors through design and combination of building blocks. This feature can be used to customize various performance parameters of OPDs, such as dark current, detectivity ( D* ), and spectral selectivity. − …”

Section: Introductionmentioning

confidence: 99%

Fluorinated Conjugated Polymers Enabled Enhanced Detectivity in Organic Near-Infrared Photodetectors

Tu,

Yao,

et al. 2024

ACS Appl. Polym. Mater.

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Halogen substitution is often used to regulate the photoelectric properties of conjugated polymers (CPs). In particular, fluorine substitution can not only regulate the energy level of CPs but also improve their crystallinity, trap density, and mobility. However, the correlation between the molecule structure of fluorinated CPs and performance of organic photodetectors (OPDs) still remains unclear and is influenced by complex factors. In this work, we have systematically investigated the effect of fluorinated building blocks in CPs on the performance of OPDs specifically considering the number of fluorine (F) atoms. We found that increasing the number of fluorine atoms in CPs gradually deepened their highest occupied molecular orbital (HOMO) energy levels. Notably, PFBDB-T-2F with four F substitutions exhibited a deep HOMO (−5.73 eV) close to the acceptor (−5.75 eV), effectively blocking minority carrier injection from the electrodes and inhibiting dark current (J dark). Consequently, the OPDs based on PFBDB-T-2F demonstrated nearly 3 orders of magnitude higher detectivity (D* = 1.06 × 1013 Jones) compared to that without fluorination. Furthermore, a trade-off between D* and responsivity (R) was observed in OPDs based on the fluorinated CPs. The excessively deep HOMO level in PFBDB-T-2F and the large phase separation of the blend film reduce the carrier collection efficiency of the device and thus decrease the R of PFBDB-T-2F-based OPDs. These findings expose the importance of carefully managing the number of fluorine atoms in the backbone of CPs to achieve a balance between detectivity and responsivity in OPDs.

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High External Quantum Efficiency and Ultra‐Narrowband Organic Photodiodes Using Single‐Component Photoabsorber With Multiple‐Resonance Effect

Yao,

Li,

Sun

et al. 2024

Advanced Materials

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Organic photodiodes (OPDs) that utilize wavelength‐selective absorbing molecules offer a direct approach to capturing specific wavelengths of light in multispectral sensors/imaging systems without filters. However, they exhibit broad response bandwidths, low external quantum efficiency (EQE), and often require compromises in two‐component photoactive materials. Herein, the first utility of boron‐nitrogen (BN) single‐component photoabsorbers, leveraging a multi‐resonance effect are introduced to attain OPDs with both record‐high EQE of 33.77% and ultra‐small full‐width half‐maximum (FWHM) of 36 nm in the reported narrowband OPDs using single‐component photoabsorbers. It is found that the outstanding performance of these narrowband OPDs can be attributed to the ultra‐small FWHM, slow charge recombination, low activation energy, and balanced bipolar charge transport within the para‐tert‐butyl substituted B,N‐embedded rigid polycyclic molecule (BNCz) film. Furthermore, BN derivatives such as BN(p)SCH3, BN(p)SO2CH3, and pyBN‐m‐H have also shown high EQE, minimal FWHM, and tunable photoresponse peaks ranging from blue‐violet to blue‐turquoise, highlighting the potential of BN molecules and molecular engineering in the development of novel narrowband absorbers for advanced wavelength‐selective OPDs. Such pioneering working can provide a class of novel narrowband absorbers to propel the advancement of high‐performance wavelength‐selective OPDs.

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High‐Performing Acid‐Free PEDOT:PSS‐Based Organic Photodiodes for Cardiovascular Disease Diagnosis

Cited by 8 publications

References 103 publications

Efficient noise suppression via controlling the optical cavity in near-infrared organic photoplethysmography sensors

Efficient noise suppression via controlling the optical cavity in near-infrared organic photoplethysmography sensors

Fluorinated Conjugated Polymers Enabled Enhanced Detectivity in Organic Near-Infrared Photodetectors

High External Quantum Efficiency and Ultra‐Narrowband Organic Photodiodes Using Single‐Component Photoabsorber With Multiple‐Resonance Effect

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