Unlocking high-performance near-infrared photodetection: polaron-assisted organic integer charge transfer hybrids

Muhammad Ahsan Iqbal; Xueqian Fang; Yasir Abbas; Xiaoliang Weng; Tingchao He; Yu-Jia Zeng

doi:10.1038/s41377-024-01695-9

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Unlocking high-performance near-infrared photodetection: polaron-assisted organic integer charge transfer hybrids

Original Articles

- Unlocking high-performance near-infrared photodetection: polaron-assisted organic integer charge transfer hybrids
- Light: Science & Applications Vol. 13, Issue 12, Pages: 3285-3296(2024)
- Affiliations：
  
  1.School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, China
  2.Guangdong Provincial Key Laboratory of Intelligent Disaster Prevention and Emergency Technologies for Urban Lifeline Engineering, Dongguan University of Technology, Dongguan 523808, China
  3.Department of Mechanics, Tianjin University, Tianjin 300350, China
  4.Shenzhen Key Laboratory of Laser Engineering, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
  5.School of Mechanical Engineering, Dongguan University of Technology, Dongguan 523808, China
- Author bio：
  
  Xueqian Fang (studxfang@yeah.net)
  Yu-Jia Zeng (yjzeng@szu.edu.cn)
- Funds：
- DOI：10.1038/s41377-024-01695-9
  CLC：
- Received：19 June 2024，
  
  Revised：17 October 2024，
  
  Accepted：2024-11-15，
  
  Published Online：09 December 2024，
  
  Published：31 December 2024
- Accepted：
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Iqbal, M. A. et al. Unlocking high-performance near-infrared photodetection: polaron-assisted organic integer charge transfer hybrids. Light: Science & Applications, 13, 3285-3296 (2024).
DOI：

Iqbal, M. A. et al. Unlocking high-performance near-infrared photodetection: polaron-assisted organic integer charge transfer hybrids. Light: Science & Applications, 13, 3285-3296 (2024). DOI： 10.1038/s41377-024-01695-9.

摘要

Abstract

Room temperature femtowatt sensitivity remains a sought-after attribute

even among commercial inorganic infrared (IR) photodetectors (PDs). While organic IR PDs are poised to emerge as a pivotal sensor technology in the forthcoming Fourth-Generation Industrial Era

their performance lags behind that of their inorganic counterparts. This discrepancy primarily stems from poor external quantum efficiencies (

EQE

)

driven by inadequate exciton dissociation (high exciton binding energy) within organic IR materials

exacerbated by pronounced non-radiative recombination at narrow bandgaps. Here

we unveil a high-performance organic Near-IR (NIR) PD via integer charge transfer between Poly[2

5-bis(3-tetradecylthiophen-2-yl)thieno[3

2-b

]

thiophene

]

(C-14PBTTT) donor (D) and Tetrafluorotetracyanoquinodimethane (TCNQF4) acceptor (A) molecules

showcasing strong low-energy subgap absorptions up to 2.5 µm. We observe that specifically

polaron excitation in these radical and neutral D-A blended molecules enables bound charges to exceed the Coulombic attraction to their counterions

leading to an elevated

EQE

(polaron absorption region) compared to Frenkel excitons. As a result

our devices achieve a high

EQE

of ~10

femtowatt sensitivity (

NEP)

of ~0.12 fW Hz

-1/2

along a response time of ~81 ms

at room temperature for a wavelength of 1.0 µm. Our innovative utilization of polarons highlights their potential as alternatives to Frenkel excitons in high-performance organic IR PDs.

关键词

Keywords

references

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