Suppressing Colloidal Quantum Dot Multimer Fusion Leads to High‐Performance InSb Infrared Photodetectors
Abstract Environmentally friendly InSb colloidal quantum dots (CQDs) short‐wave infrared (SWIR) photodetectors feature characteristics of low‐cost, high‐volume scalability, CMOS integrability, and compliance with RoHS regulations, and hold great commercial potential. Yet, their performance falls sho...
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Wiley
2025-07-01
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| Series: | Advanced Science |
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| Online Access: | https://doi.org/10.1002/advs.202502775 |
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| author | Lucheng Peng Yongjie Wang Carmelita Rodà Aditya Malla Miguel Dosil Debranjan Mandal Gerasimos Konstantatos |
| author_facet | Lucheng Peng Yongjie Wang Carmelita Rodà Aditya Malla Miguel Dosil Debranjan Mandal Gerasimos Konstantatos |
| author_sort | Lucheng Peng |
| collection | DOAJ |
| description | Abstract Environmentally friendly InSb colloidal quantum dots (CQDs) short‐wave infrared (SWIR) photodetectors feature characteristics of low‐cost, high‐volume scalability, CMOS integrability, and compliance with RoHS regulations, and hold great commercial potential. Yet, their performance falls short of commercially relevant specifications. In this work, it is posited that CQD fusion observed in these dots leads to the formation of band‐tail trap states and it is further demonstrated that avoidance of such band‐tail trap states is crucial for device performance. By doing so, InSb CQDs SWIR photodetectors are reported with compelling performance metrics, including a dark current of 4 µA cm−2, EQE of ≈20% (at −1 V), a linear dynamic range over 140 dB and a response time of 90 ns. This represents a more than ten‐fold reduction in dark current compared to previously report InSb CQD photodetectors in the SWIR range. The record high PLQY of 10% for InSb/InP CQDs taken together with the high EQE of the device at zero bias confirm the achievement of high‐quality InSb CQDs through the suppression of band‐tail trap states and passivation of surface defects. |
| format | Article |
| id | doaj-art-d763951276d1421daec19108085501f4 |
| institution | Kabale University |
| issn | 2198-3844 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advanced Science |
| spelling | doaj-art-d763951276d1421daec19108085501f42025-08-20T03:30:37ZengWileyAdvanced Science2198-38442025-07-011227n/an/a10.1002/advs.202502775Suppressing Colloidal Quantum Dot Multimer Fusion Leads to High‐Performance InSb Infrared PhotodetectorsLucheng Peng0Yongjie Wang1Carmelita Rodà2Aditya Malla3Miguel Dosil4Debranjan Mandal5Gerasimos Konstantatos6ICFO‐Insitut de Ciencies Fotoniques The Barcelona Institute of Science and Technology Castelldefels Barcelona 08860 SpainICFO‐Insitut de Ciencies Fotoniques The Barcelona Institute of Science and Technology Castelldefels Barcelona 08860 SpainICFO‐Insitut de Ciencies Fotoniques The Barcelona Institute of Science and Technology Castelldefels Barcelona 08860 SpainICFO‐Insitut de Ciencies Fotoniques The Barcelona Institute of Science and Technology Castelldefels Barcelona 08860 SpainICFO‐Insitut de Ciencies Fotoniques The Barcelona Institute of Science and Technology Castelldefels Barcelona 08860 SpainICFO‐Insitut de Ciencies Fotoniques The Barcelona Institute of Science and Technology Castelldefels Barcelona 08860 SpainICFO‐Insitut de Ciencies Fotoniques The Barcelona Institute of Science and Technology Castelldefels Barcelona 08860 SpainAbstract Environmentally friendly InSb colloidal quantum dots (CQDs) short‐wave infrared (SWIR) photodetectors feature characteristics of low‐cost, high‐volume scalability, CMOS integrability, and compliance with RoHS regulations, and hold great commercial potential. Yet, their performance falls short of commercially relevant specifications. In this work, it is posited that CQD fusion observed in these dots leads to the formation of band‐tail trap states and it is further demonstrated that avoidance of such band‐tail trap states is crucial for device performance. By doing so, InSb CQDs SWIR photodetectors are reported with compelling performance metrics, including a dark current of 4 µA cm−2, EQE of ≈20% (at −1 V), a linear dynamic range over 140 dB and a response time of 90 ns. This represents a more than ten‐fold reduction in dark current compared to previously report InSb CQD photodetectors in the SWIR range. The record high PLQY of 10% for InSb/InP CQDs taken together with the high EQE of the device at zero bias confirm the achievement of high‐quality InSb CQDs through the suppression of band‐tail trap states and passivation of surface defects.https://doi.org/10.1002/advs.202502775band‐tail statesInSbphotodetectorsquantum dotsshort‐wave infrared |
| spellingShingle | Lucheng Peng Yongjie Wang Carmelita Rodà Aditya Malla Miguel Dosil Debranjan Mandal Gerasimos Konstantatos Suppressing Colloidal Quantum Dot Multimer Fusion Leads to High‐Performance InSb Infrared Photodetectors Advanced Science band‐tail states InSb photodetectors quantum dots short‐wave infrared |
| title | Suppressing Colloidal Quantum Dot Multimer Fusion Leads to High‐Performance InSb Infrared Photodetectors |
| title_full | Suppressing Colloidal Quantum Dot Multimer Fusion Leads to High‐Performance InSb Infrared Photodetectors |
| title_fullStr | Suppressing Colloidal Quantum Dot Multimer Fusion Leads to High‐Performance InSb Infrared Photodetectors |
| title_full_unstemmed | Suppressing Colloidal Quantum Dot Multimer Fusion Leads to High‐Performance InSb Infrared Photodetectors |
| title_short | Suppressing Colloidal Quantum Dot Multimer Fusion Leads to High‐Performance InSb Infrared Photodetectors |
| title_sort | suppressing colloidal quantum dot multimer fusion leads to high performance insb infrared photodetectors |
| topic | band‐tail states InSb photodetectors quantum dots short‐wave infrared |
| url | https://doi.org/10.1002/advs.202502775 |
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