Squaraine Dyes for Organic Photomultiplication Photodetectors with 220% External Quantum Efficiency at 1240 nm
Abstract Near‐infrared (NIR) light detection at wavelengths λ > 1100 nm is essential in modern science and technology. Emerging organic semiconductors are promising for solution‐processed, flexible, and large‐area NIR organic photodetectors (OPDs), but only a few organic chromophores with peak ab...
Saved in:
| Main Authors: | , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2025-07-01
|
| Series: | Advanced Science |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/advs.202502320 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849765188385898496 |
|---|---|
| author | Joshua Csucker Elodie Didier João Pedro Ferreira Assunção Daniel Rentsch Radha Kothandaraman Dominik Bachmann Ivan Shorubalko Frank Nüesch Roland Hany Michael Bauer |
| author_facet | Joshua Csucker Elodie Didier João Pedro Ferreira Assunção Daniel Rentsch Radha Kothandaraman Dominik Bachmann Ivan Shorubalko Frank Nüesch Roland Hany Michael Bauer |
| author_sort | Joshua Csucker |
| collection | DOAJ |
| description | Abstract Near‐infrared (NIR) light detection at wavelengths λ > 1100 nm is essential in modern science and technology. Emerging organic semiconductors are promising for solution‐processed, flexible, and large‐area NIR organic photodetectors (OPDs), but only a few organic chromophores with peak absorption beyond the silicon bandgap are available. Furthermore, the external quantum efficiency (EQE) and specific detectivity (D*) of NIR OPDs are restricted by insufficient exciton dissociation and high dark/noise current. Here, the combination of strong electron‐accepting and ‐donating groups is used to synthesize a selection of novel NIR squaraine dyes with superior redshifted absorptions, peaking at 1165 nm in solution and extending to 1240 nm in a blend film. To overcome the tradeoff between long wavelength absorption and high photoresponse, NIR photons are detected utilizing a gain OPD design, where photomultiplication occurs via squaraine hole trap‐induced injection of external charges. The OPD can achieve an EQE of 220% at 1240 nm and still maintains 25% in the absorption tail at 1400 nm, thereby surpassing existing NIR OPDs in a broad wavelength range beyond 1100 nm. The measured maximum D* equals 109 Jones at 1240 nm, and the detectivity estimated from the shot noise is ≈1011 Jones, independent of the bias voltage. |
| format | Article |
| id | doaj-art-422efdefddd1406ba4183c7cd4093284 |
| institution | DOAJ |
| issn | 2198-3844 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advanced Science |
| spelling | doaj-art-422efdefddd1406ba4183c7cd40932842025-08-20T03:04:57ZengWileyAdvanced Science2198-38442025-07-011226n/an/a10.1002/advs.202502320Squaraine Dyes for Organic Photomultiplication Photodetectors with 220% External Quantum Efficiency at 1240 nmJoshua Csucker0Elodie Didier1João Pedro Ferreira Assunção2Daniel Rentsch3Radha Kothandaraman4Dominik Bachmann5Ivan Shorubalko6Frank Nüesch7Roland Hany8Michael Bauer9Empa Swiss Federal Laboratories for Materials Science and Technology Laboratory for Functional Polymers Dübendorf CH‐8600 SwitzerlandEmpa Swiss Federal Laboratories for Materials Science and Technology Laboratory for Functional Polymers Dübendorf CH‐8600 SwitzerlandEmpa Swiss Federal Laboratories for Materials Science and Technology Laboratory for Functional Polymers Dübendorf CH‐8600 SwitzerlandEmpa Swiss Federal Laboratories for Materials Science and Technology Laboratory for Functional Polymers Dübendorf CH‐8600 SwitzerlandEmpa Swiss Federal Laboratories for Materials Science and Technology Laboratory for Thin Films and Photovoltaics Dübendorf CH‐8600 SwitzerlandEmpa Swiss Federal Laboratories for Materials Science and Technology Transport at Nanoscale Interfaces Laboratory Dübendorf CH‐8600 SwitzerlandEmpa Swiss Federal Laboratories for Materials Science and Technology Transport at Nanoscale Interfaces Laboratory Dübendorf CH‐8600 SwitzerlandEmpa Swiss Federal Laboratories for Materials Science and Technology Laboratory for Functional Polymers Dübendorf CH‐8600 SwitzerlandEmpa Swiss Federal Laboratories for Materials Science and Technology Laboratory for Functional Polymers Dübendorf CH‐8600 SwitzerlandEmpa Swiss Federal Laboratories for Materials Science and Technology Laboratory for Functional Polymers Dübendorf CH‐8600 SwitzerlandAbstract Near‐infrared (NIR) light detection at wavelengths λ > 1100 nm is essential in modern science and technology. Emerging organic semiconductors are promising for solution‐processed, flexible, and large‐area NIR organic photodetectors (OPDs), but only a few organic chromophores with peak absorption beyond the silicon bandgap are available. Furthermore, the external quantum efficiency (EQE) and specific detectivity (D*) of NIR OPDs are restricted by insufficient exciton dissociation and high dark/noise current. Here, the combination of strong electron‐accepting and ‐donating groups is used to synthesize a selection of novel NIR squaraine dyes with superior redshifted absorptions, peaking at 1165 nm in solution and extending to 1240 nm in a blend film. To overcome the tradeoff between long wavelength absorption and high photoresponse, NIR photons are detected utilizing a gain OPD design, where photomultiplication occurs via squaraine hole trap‐induced injection of external charges. The OPD can achieve an EQE of 220% at 1240 nm and still maintains 25% in the absorption tail at 1400 nm, thereby surpassing existing NIR OPDs in a broad wavelength range beyond 1100 nm. The measured maximum D* equals 109 Jones at 1240 nm, and the detectivity estimated from the shot noise is ≈1011 Jones, independent of the bias voltage.https://doi.org/10.1002/advs.202502320gain photodetectornear infraredorganic photodetectorphotomultiplicationsquaraine dye |
| spellingShingle | Joshua Csucker Elodie Didier João Pedro Ferreira Assunção Daniel Rentsch Radha Kothandaraman Dominik Bachmann Ivan Shorubalko Frank Nüesch Roland Hany Michael Bauer Squaraine Dyes for Organic Photomultiplication Photodetectors with 220% External Quantum Efficiency at 1240 nm Advanced Science gain photodetector near infrared organic photodetector photomultiplication squaraine dye |
| title | Squaraine Dyes for Organic Photomultiplication Photodetectors with 220% External Quantum Efficiency at 1240 nm |
| title_full | Squaraine Dyes for Organic Photomultiplication Photodetectors with 220% External Quantum Efficiency at 1240 nm |
| title_fullStr | Squaraine Dyes for Organic Photomultiplication Photodetectors with 220% External Quantum Efficiency at 1240 nm |
| title_full_unstemmed | Squaraine Dyes for Organic Photomultiplication Photodetectors with 220% External Quantum Efficiency at 1240 nm |
| title_short | Squaraine Dyes for Organic Photomultiplication Photodetectors with 220% External Quantum Efficiency at 1240 nm |
| title_sort | squaraine dyes for organic photomultiplication photodetectors with 220 external quantum efficiency at 1240 nm |
| topic | gain photodetector near infrared organic photodetector photomultiplication squaraine dye |
| url | https://doi.org/10.1002/advs.202502320 |
| work_keys_str_mv | AT joshuacsucker squarainedyesfororganicphotomultiplicationphotodetectorswith220externalquantumefficiencyat1240nm AT elodiedidier squarainedyesfororganicphotomultiplicationphotodetectorswith220externalquantumefficiencyat1240nm AT joaopedroferreiraassuncao squarainedyesfororganicphotomultiplicationphotodetectorswith220externalquantumefficiencyat1240nm AT danielrentsch squarainedyesfororganicphotomultiplicationphotodetectorswith220externalquantumefficiencyat1240nm AT radhakothandaraman squarainedyesfororganicphotomultiplicationphotodetectorswith220externalquantumefficiencyat1240nm AT dominikbachmann squarainedyesfororganicphotomultiplicationphotodetectorswith220externalquantumefficiencyat1240nm AT ivanshorubalko squarainedyesfororganicphotomultiplicationphotodetectorswith220externalquantumefficiencyat1240nm AT franknuesch squarainedyesfororganicphotomultiplicationphotodetectorswith220externalquantumefficiencyat1240nm AT rolandhany squarainedyesfororganicphotomultiplicationphotodetectorswith220externalquantumefficiencyat1240nm AT michaelbauer squarainedyesfororganicphotomultiplicationphotodetectorswith220externalquantumefficiencyat1240nm |