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Related Concept Videos

Inductively Coupled Plasma–Mass Spectrometry (ICP–MS): Overview01:19

Inductively Coupled Plasma–Mass Spectrometry (ICP–MS): Overview

In inductively coupled plasma–mass spectrometry (ICP–MS), an inductively coupled plasma (ICP) torch is used as an atomizer and ionizer. Solid samples are dissolved and volatilized before being introduced into the high-temperature argon plasma, while solution samples are nebulized and passed through the high-temperature argon plasma. Plasma dissociates the analytes and ionizes their component atoms to form a mixture of positive ions and molecular species. The positive ions are then passed on to...

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Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer
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High-Detectivity Organic Photodetector with InP Quantum Dots in PTB7-Th:PC71BM Ternary Bulk Heterojunction.

Eunki Baek1, Sung-Yoon Joe1, Hyunbum Kang2

  • 1School of Semiconductor∙Display Technology, Hallym University, Chuncheon 24252, Republic of Korea.

Polymers
|August 28, 2025
PubMed
Summary

By adding quantum dots (QDs) to organic photodiodes (OPDs), researchers significantly improved sensitivity and reduced dark current. This breakthrough enhances biophotonic sensing and imaging applications.

Keywords:
InP quantum dotsbulk heterojunction (BHJ)low dark currentorganic photodiode (OPD)photoplethysmographypolymersspecific detectivity

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Organic photodiodes (OPDs) are promising for low-power biosensing and imaging but face limitations in spectral response and interfacial trap states.
  • Improving external quantum efficiency (EQE) and reducing dark current are key challenges for OPD performance.

Purpose of the Study:

  • To develop a highly sensitive polymer photodiode by incorporating quantum dots (QDs) into a bulk heterojunction (BHJ) matrix.
  • To enhance the performance of OPDs by addressing spectral mismatch and interfacial trap states through QD doping.

Main Methods:

  • Trace incorporation of InP/ZnSe/ZnS quantum dots (QDs) (0.8 wt%) into a PTB7-Th:PC71BM BHJ matrix.
  • Characterization of photodiode performance, including EQE, dark current density, internal quantum efficiency (IQE), and specific detectivity (D*).

Main Results:

  • QD doping enhanced EQE (540-660 nm) and suppressed dark current density by passivating trap states.
  • IQE increased from ~80% to ~95%, leading to a net EQE improvement and a 93% increase in specific detectivity (D* to 1.8 × 10^13 Jones).
  • Achieved ultra-low dark current density (7.76 × 10^-10 A/cm^2) and a 4 dB improvement in signal-to-noise ratio (SNR) for photoplethysmography (PPG) signals.

Conclusions:

  • Quantum dot incorporation is an effective strategy for spectral and interfacial engineering in OPDs.
  • This approach offers a scalable route to advance OPD performance for low-power biosensors and high-resolution imaging.
  • Precise compositional control of QDs is crucial to avoid optical losses and increased dark current.