Direct Dynamic Evidence of Charge Separation in a Dye‐Sensitized Solar Cell Obtained under Operando Conditions by Raman Spectroscopy
| Autor: | Yutong Ye, Libin Zang, Yeonju Park, Haiming Lv, Zhu Mao, Young Mee Jung, Xiao Xia Han, Bing Zhao |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
010405 organic chemistry business.industry Photovoltaic system General Medicine General Chemistry 010402 general chemistry Photochemistry Resonance (chemistry) 01 natural sciences Catalysis 0104 chemical sciences law.invention Polyiodide chemistry.chemical_compound symbols.namesake Dye-sensitized solar cell Semiconductor chemistry law Solar cell symbols Raman spectroscopy Spectroscopy business |
| Zdroj: | Angewandte Chemie International Edition. 59:10780-10784 |
| ISSN: | 1521-3773 1433-7851 |
| DOI: | 10.1002/anie.201915824 |
| Popis: | Interfaces play an important role in enhancing the energy conversion performance of dye-sensitized solar cells (DSCs). The interface effects have been studied by many techniques, but most of the studies only focused on one part of a DSC, rather than on a complete solar cell. Hence, monitoring the interface evolution of a DSC is still very challenging. Here, in situ/operando resonance Raman (RR) spectroscopic analyses were carried out to monitor the dynamics of the photovoltaic conversion processes in a DSC. We observed the creation of new species (i.e., polyiodide and iodine aggregates) in the photosensitization process. We also obtained molecular-scale dynamic evidence that the bands from the C=C and C=N bonds of 2,2'-bipyridyl (bpy), the S=C=N bonds of the NCS ligand, and photochemical products undergo reasonably strong intensity and frequency changes, which clearly demonstrates that they are involved in charge separation. Furthermore, RR spectroscopy can also be used to quickly evaluate the performance of DSCs. |
| Databáze: | OpenAIRE |
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