Sub-nanosecond Intrinsic Response Time of PbS Nanocrystal IR-Photodetectors
Colloidal nanocrystals (NCs), especially lead sulfide NCs, are promising candidates for solution-processed next-generation photodetectors with high-speed operation frequencies. However, the intrinsic response time of PbS-NC photodetectors, which is the material-specific physical limit, is still elus...
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| Published in | Nano letters Vol. 22; no. 7; pp. 2809 - 2816 |
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| Main Authors | , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
United States
American Chemical Society
13.04.2022
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| Subjects | |
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| Abstract | Colloidal nanocrystals (NCs), especially lead sulfide NCs, are promising candidates for solution-processed next-generation photodetectors with high-speed operation frequencies. However, the intrinsic response time of PbS-NC photodetectors, which is the material-specific physical limit, is still elusive, as the reported response times are typically limited by the device geometry. Here, we use the two-pulse coincidence photoresponse technique to identify the intrinsic response time of 1,2-ethanedithiol-functionalized PbS-NC photodetectors after femtosecond-pulsed 1560 nm excitation. We obtain an intrinsic response time of ∼1 ns, indicating an intrinsic bandwidth of ∼0.55 GHz as the material-specific limit. Examination of the dependence on laser power, gating, bias, temperature, channel length, and environmental conditions suggest that Auger recombination, assisted by NC-surface defects, is the dominant mechanism. Accordingly, the intrinsic response time might further be tuned by specifically controlling the ligand coverage and trap states. Thus, PbS-NC photodetectors are feasible for gigahertz optical communication in the third telecommunication window. |
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| AbstractList | Colloidal nanocrystals (NCs), especially lead sulfide NCs, are promising candidates for solution-processed next-generation photodetectors with high-speed operation frequencies. However, the intrinsic response time of PbS-NC photodetectors, which is the material-specific physical limit, is still elusive, as the reported response times are typically limited by the device geometry. Here, we use the two-pulse coincidence photoresponse technique to identify the intrinsic response time of 1,2-ethanedithiol-functionalized PbS-NC photodetectors after femtosecond-pulsed 1560 nm excitation. We obtain an intrinsic response time of ∼1 ns, indicating an intrinsic bandwidth of ∼0.55 GHz as the material-specific limit. Examination of the dependence on laser power, gating, bias, temperature, channel length, and environmental conditions suggest that Auger recombination, assisted by NC-surface defects, is the dominant mechanism. Accordingly, the intrinsic response time might further be tuned by specifically controlling the ligand coverage and trap states. Thus, PbS-NC photodetectors are feasible for gigahertz optical communication in the third telecommunication window. |
| Author | Braun, Kai Scheele, Marcus Maier, Andre Kohlschreiber, Pia Schedel, Christine Strauß, Fabian |
| AuthorAffiliation | Institute of Physical and Theoretical Chemistry Center for Light−Matter Interaction, Sensors and Analytics LISA Universität Tübingen |
| AuthorAffiliation_xml | – name: Center for Light−Matter Interaction, Sensors and Analytics LISA – name: – name: Universität Tübingen – name: Institute of Physical and Theoretical Chemistry |
| Author_xml | – sequence: 1 givenname: Andre surname: Maier fullname: Maier, Andre email: andre.maier@uni-tuebingen.de organization: Universität Tübingen – sequence: 2 givenname: Fabian surname: Strauß fullname: Strauß, Fabian organization: Universität Tübingen – sequence: 3 givenname: Pia surname: Kohlschreiber fullname: Kohlschreiber, Pia organization: Universität Tübingen – sequence: 4 givenname: Christine surname: Schedel fullname: Schedel, Christine organization: Institute of Physical and Theoretical Chemistry – sequence: 5 givenname: Kai orcidid: 0000-0003-3774-0507 surname: Braun fullname: Braun, Kai email: kai.braun@uni-tuebingen.de organization: Universität Tübingen – sequence: 6 givenname: Marcus orcidid: 0000-0002-2704-3591 surname: Scheele fullname: Scheele, Marcus email: marcus.scheele@uni-tuebingen.de organization: Universität Tübingen |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/35311295$$D View this record in MEDLINE/PubMed |
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| Title | Sub-nanosecond Intrinsic Response Time of PbS Nanocrystal IR-Photodetectors |
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