Details
| Translated title of the contribution | Partikelwechselwirkungen haben Einfluss: Ladungsträger Dynamiken in Hybrid Halbleiter-Metall Kryoaerogelen |
|---|---|
| Original language | English |
| Article number | 2200055 |
| Journal | Advanced Materials Interfaces |
| Volume | 9 |
| Issue number | 12 |
| Publication status | Published - 22 Apr 2022 |
Abstract
Keywords
- charge carrier separation, cryoaerogels, hybrid nanocrystal gels, semiconductor–metal hybrid gels, spectroelectrochemistry
ASJC Scopus subject areas
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
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In: Advanced Materials Interfaces, Vol. 9, No. 12, 2200055, 22.04.2022.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Interparticle Interaction Matters
T2 - Charge Carrier Dynamics in Hybrid Semiconductor–Metal Cryoaerogels
AU - Schlosser, Anja
AU - Schlenkrich, Jakob Cornelius
AU - Zambo, Daniel
AU - Rosebrock, Marina
AU - Graf, Rebecca Tatjana
AU - Escobar Cano, Giamper Eliseo
AU - Bigall, Nadja-Carola
N1 - Funding Information: A.S. and J.S. contributed equally to this work. The authors would like to acknowledge the financial support from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (Grant Agreement No. 714429). In addition, this work was funded by the German Research Foundation (Deutsche Forschungsgemeinschaft, DFG) under Germany's excellence strategy within the cluster of excellence PhoenixD (EXC 2122, project ID 390833453) and the grant BI 1708/4‐1. D.Z. acknowledges the program financed by the National Research, Development and Innovation Office of the Ministry for Innovation and Technology, Hungary (TKP2021‐NKTA‐05). A.S. and R.T.G. are thankful for financial support from the Hannover School for Nanotechnology (hsn). The authors also thank Armin Feldhoff and Jürgen Caro for providing the SEM facility, and the LNQE for providing the TEM.
PY - 2022/4/22
Y1 - 2022/4/22
N2 - Integration of noble metals into semiconductor-based nanoparticle gel structures facilitates the extraction of photoexcited charge carriers upon illumination. While charge carrier generation takes place in the semiconductor component, noble metals in contact to the semiconductor act as electron sinks. Thus, the nature of the interface between the components is of essential importance, as it dictates the characteristics of the interparticle contact. Here, the influence of the nanoscale building block design on the charge carrier dynamics in cryoaerogels consisting of CdSe/CdS nanorods and nanoplatelets as well as of gold or platinum is reported. It is shown that direct growth of noble metal domains onto the semiconductor prior to the gelation significantly facilitates charge carrier separation in their cryoaerogel structures compared to gels from the colloidal mixtures of semiconductor and noble metal nanoparticles, the latter ones having less defined metal/semiconductor boundaries and much more arbitrary component distributions. Although the structure of the different cryoaerogel systems is similar at the micro- and macroscale, nanoscale differences caused by the two synthetic routes drive essentially different behavior regarding the charge carrier dynamics efficiency. These effects are observed spectroelectrochemically via intensity-modulated photocurrent spectroscopy emphasizing the importance of the semiconductor–metal connection in the hybrid structures.
AB - Integration of noble metals into semiconductor-based nanoparticle gel structures facilitates the extraction of photoexcited charge carriers upon illumination. While charge carrier generation takes place in the semiconductor component, noble metals in contact to the semiconductor act as electron sinks. Thus, the nature of the interface between the components is of essential importance, as it dictates the characteristics of the interparticle contact. Here, the influence of the nanoscale building block design on the charge carrier dynamics in cryoaerogels consisting of CdSe/CdS nanorods and nanoplatelets as well as of gold or platinum is reported. It is shown that direct growth of noble metal domains onto the semiconductor prior to the gelation significantly facilitates charge carrier separation in their cryoaerogel structures compared to gels from the colloidal mixtures of semiconductor and noble metal nanoparticles, the latter ones having less defined metal/semiconductor boundaries and much more arbitrary component distributions. Although the structure of the different cryoaerogel systems is similar at the micro- and macroscale, nanoscale differences caused by the two synthetic routes drive essentially different behavior regarding the charge carrier dynamics efficiency. These effects are observed spectroelectrochemically via intensity-modulated photocurrent spectroscopy emphasizing the importance of the semiconductor–metal connection in the hybrid structures.
KW - charge carrier separation
KW - cryoaerogels
KW - hybrid nanocrystal gels
KW - semiconductor–metal hybrid gels
KW - spectroelectrochemistry
UR - http://www.scopus.com/inward/record.url?scp=85124716655&partnerID=8YFLogxK
U2 - 10.1002/admi.202200055
DO - 10.1002/admi.202200055
M3 - Article
VL - 9
JO - Advanced Materials Interfaces
JF - Advanced Materials Interfaces
SN - 2196-7350
IS - 12
M1 - 2200055
ER -