Solution‐Processed Ternary Organic Photodetectors with Ambipolar Small‐Bandgap Polymer for Near‐Infrared Sensing
Abstract Organic photodetectors (OPDs) detecting light in the near‐infrared (NIR) range from 900 to 1200 nm offer numerous applications in biomedical imaging and health monitoring. However, an ultra‐low bandgap of the electron donor compound required to achieve NIR detection poses a unique challenge...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Wiley-VCH
2024-02-01
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| Series: | Advanced Electronic Materials |
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| Online Access: | https://doi.org/10.1002/aelm.202300583 |
| _version_ | 1797294326719447040 |
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| author | Gurudutt Bhat Marcin Kielar Pankaj Sah Ajay K. Pandey Prashant Sonar |
| author_facet | Gurudutt Bhat Marcin Kielar Pankaj Sah Ajay K. Pandey Prashant Sonar |
| author_sort | Gurudutt Bhat |
| collection | DOAJ |
| description | Abstract Organic photodetectors (OPDs) detecting light in the near‐infrared (NIR) range from 900 to 1200 nm offer numerous applications in biomedical imaging and health monitoring. However, an ultra‐low bandgap of the electron donor compound required to achieve NIR detection poses a unique challenge in selecting a complementary acceptor material with a suitable energy‐level offset. To tackle this, a solution‐processed, fullerene‐dominated, ternary device is engineered by adding an ultra‐low bandgap (0.6–0.8 eV) ambipolar polymer, polybenzobisthiadiazole‐dithienocyclopentane (PBBTCD), into the active layer of visible‐light‐responsive OPDs (bandgap of 1.8 eV) to form a ternary blend. The resulting OPD benefits from the extended absorption beyond 1000 nm. The cascaded energy level alignment within the ternary blend and the applied reverse bias both improve the overall NIR photocurrent responsivity by 2 orders of magnitude, reaching 0.4 mA W−1 at 1050 nm and −2 V for ternary devices. Furthermore, a photovoltage responsivity of 0.3 mV m2 W−1 along with significant open‐circuit voltage (Voc) of 0.12 V allow NIR detection in the Voc mode. Prominently, this ability is accomplished with a minimal presence of PBBTCD. Taken together, this work indicates potential strategies for extending the spectral activity of conventional OPDs through introduction of an ambipolar ultra‐low bandgap polymer as a minor element. |
| first_indexed | 2024-03-07T21:28:37Z |
| format | Article |
| id | doaj.art-45227789863e4e1d8c8508b6c93fca2c |
| institution | Directory Open Access Journal |
| issn | 2199-160X |
| language | English |
| last_indexed | 2024-03-07T21:28:37Z |
| publishDate | 2024-02-01 |
| publisher | Wiley-VCH |
| record_format | Article |
| series | Advanced Electronic Materials |
| spelling | doaj.art-45227789863e4e1d8c8508b6c93fca2c2024-02-27T04:06:06ZengWiley-VCHAdvanced Electronic Materials2199-160X2024-02-01102n/an/a10.1002/aelm.202300583Solution‐Processed Ternary Organic Photodetectors with Ambipolar Small‐Bandgap Polymer for Near‐Infrared SensingGurudutt Bhat0Marcin Kielar1Pankaj Sah2Ajay K. Pandey3Prashant Sonar4School of Chemistry and Physics, Faculty of Science Queensland University of Technology Brisbane QLD 4000 AustraliaQueensland Brain Institute The University of Queensland St Lucia QLD 4072 AustraliaQueensland Brain Institute The University of Queensland St Lucia QLD 4072 AustraliaSchool of Electrical Engineering and Robotics Faculty of Engineering Queensland University of Technology Brisbane QLD 4001 AustraliaSchool of Chemistry and Physics, Faculty of Science Queensland University of Technology Brisbane QLD 4000 AustraliaAbstract Organic photodetectors (OPDs) detecting light in the near‐infrared (NIR) range from 900 to 1200 nm offer numerous applications in biomedical imaging and health monitoring. However, an ultra‐low bandgap of the electron donor compound required to achieve NIR detection poses a unique challenge in selecting a complementary acceptor material with a suitable energy‐level offset. To tackle this, a solution‐processed, fullerene‐dominated, ternary device is engineered by adding an ultra‐low bandgap (0.6–0.8 eV) ambipolar polymer, polybenzobisthiadiazole‐dithienocyclopentane (PBBTCD), into the active layer of visible‐light‐responsive OPDs (bandgap of 1.8 eV) to form a ternary blend. The resulting OPD benefits from the extended absorption beyond 1000 nm. The cascaded energy level alignment within the ternary blend and the applied reverse bias both improve the overall NIR photocurrent responsivity by 2 orders of magnitude, reaching 0.4 mA W−1 at 1050 nm and −2 V for ternary devices. Furthermore, a photovoltage responsivity of 0.3 mV m2 W−1 along with significant open‐circuit voltage (Voc) of 0.12 V allow NIR detection in the Voc mode. Prominently, this ability is accomplished with a minimal presence of PBBTCD. Taken together, this work indicates potential strategies for extending the spectral activity of conventional OPDs through introduction of an ambipolar ultra‐low bandgap polymer as a minor element.https://doi.org/10.1002/aelm.202300583near‐infrared detectionNIROPDorganic photodetectorsPBBTCDternary |
| spellingShingle | Gurudutt Bhat Marcin Kielar Pankaj Sah Ajay K. Pandey Prashant Sonar Solution‐Processed Ternary Organic Photodetectors with Ambipolar Small‐Bandgap Polymer for Near‐Infrared Sensing Advanced Electronic Materials near‐infrared detection NIR OPD organic photodetectors PBBTCD ternary |
| title | Solution‐Processed Ternary Organic Photodetectors with Ambipolar Small‐Bandgap Polymer for Near‐Infrared Sensing |
| title_full | Solution‐Processed Ternary Organic Photodetectors with Ambipolar Small‐Bandgap Polymer for Near‐Infrared Sensing |
| title_fullStr | Solution‐Processed Ternary Organic Photodetectors with Ambipolar Small‐Bandgap Polymer for Near‐Infrared Sensing |
| title_full_unstemmed | Solution‐Processed Ternary Organic Photodetectors with Ambipolar Small‐Bandgap Polymer for Near‐Infrared Sensing |
| title_short | Solution‐Processed Ternary Organic Photodetectors with Ambipolar Small‐Bandgap Polymer for Near‐Infrared Sensing |
| title_sort | solution processed ternary organic photodetectors with ambipolar small bandgap polymer for near infrared sensing |
| topic | near‐infrared detection NIR OPD organic photodetectors PBBTCD ternary |
| url | https://doi.org/10.1002/aelm.202300583 |
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