Unlocking high-performance near-infrared photodetection: polaron-assisted organic integer charge transfer hybrids
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 b...
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Nature Publishing Group
2024-12-01
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| Series: | Light: Science & Applications |
| Online Access: | https://doi.org/10.1038/s41377-024-01695-9 |
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| author | Muhammad Ahsan Iqbal Xueqian Fang Yasir Abbas Xiaoliang Weng Tingchao He Yu-Jia Zeng |
| author_facet | Muhammad Ahsan Iqbal Xueqian Fang Yasir Abbas Xiaoliang Weng Tingchao He Yu-Jia Zeng |
| author_sort | Muhammad Ahsan Iqbal |
| collection | DOAJ |
| description | 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 ∼107%, 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. |
| format | Article |
| id | doaj-art-7dac77221f4547a7bdbc37ebb7511a71 |
| institution | OA Journals |
| issn | 2047-7538 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Nature Publishing Group |
| record_format | Article |
| series | Light: Science & Applications |
| spelling | doaj-art-7dac77221f4547a7bdbc37ebb7511a712025-08-20T01:56:46ZengNature Publishing GroupLight: Science & Applications2047-75382024-12-0113111210.1038/s41377-024-01695-9Unlocking high-performance near-infrared photodetection: polaron-assisted organic integer charge transfer hybridsMuhammad Ahsan Iqbal0Xueqian Fang1Yasir Abbas2Xiaoliang Weng3Tingchao He4Yu-Jia Zeng5School of Environment and Civil Engineering, Dongguan University of TechnologySchool of Environment and Civil Engineering, Dongguan University of TechnologySchool of Mechanical Engineering, Dongguan University of TechnologyShenzhen 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 UniversityShenzhen 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 UniversityShenzhen 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 UniversityAbstract 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 ∼107%, 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.https://doi.org/10.1038/s41377-024-01695-9 |
| spellingShingle | Muhammad Ahsan Iqbal Xueqian Fang Yasir Abbas Xiaoliang Weng Tingchao He Yu-Jia Zeng Unlocking high-performance near-infrared photodetection: polaron-assisted organic integer charge transfer hybrids Light: Science & Applications |
| title | Unlocking high-performance near-infrared photodetection: polaron-assisted organic integer charge transfer hybrids |
| title_full | Unlocking high-performance near-infrared photodetection: polaron-assisted organic integer charge transfer hybrids |
| title_fullStr | Unlocking high-performance near-infrared photodetection: polaron-assisted organic integer charge transfer hybrids |
| title_full_unstemmed | Unlocking high-performance near-infrared photodetection: polaron-assisted organic integer charge transfer hybrids |
| title_short | Unlocking high-performance near-infrared photodetection: polaron-assisted organic integer charge transfer hybrids |
| title_sort | unlocking high performance near infrared photodetection polaron assisted organic integer charge transfer hybrids |
| url | https://doi.org/10.1038/s41377-024-01695-9 |
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