Electronic structure dynamics in a low bandgap polymer studied by time-resolved photoelectron spectroscopy
Means to measure the temporal evolution following a photo-excitation in conjugated polymers are a key for the understanding and optimization of their function in applications such as organic solar cells. In this paper we study the electronic structure dynamics by direct pump-probe measurements of th...
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| Veröffentlicht in: | Physical chemistry chemical physics : PCCP 2016, Vol.18 (31), p.21921-21929 |
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| creator | Cappel, Ute B Plogmaker, Stefan Terschlüsen, Joachim A Leitner, Torsten Johansson, Erik M. J Edvinsson, Tomas Sandell, Anders Karis, Olof Siegbahn, Hans Svensson, Svante Mårtensson, Nils Rensmo, Håkan Söderström, Johan |
| description | Means to measure the temporal evolution following a photo-excitation in conjugated polymers are a key for the understanding and optimization of their function in applications such as organic solar cells. In this paper we study the electronic structure dynamics by direct pump-probe measurements of the excited electrons in such materials. Specifically, we carried out a time-resolved photoelectron spectroscopy (TRPES) study of the polymer PCPDTBT by combining an extreme ultraviolet (XUV) high harmonic generation source with a time-of-flight spectrometer. After excitation to either the 1st excited state or to a higher excited state, we follow how the electronic structure develops and relaxes on the electron binding energy scale. Specifically, we follow a less than 50 fs relaxation of the higher exited state and a 10 times slower relaxation of the 1st excited state. We corroborate the results using DFT calculations. Our study demonstrates the power of TRPES for studying photo-excited electron energetics and dynamics of solar cell materials.
The excited electronic structure of PCPDTBT was measured by combining a high harmonic generation source and a time-of-flight spectrometer. |
| doi_str_mv | 10.1039/c6cp04136a |
| format | Article |
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The excited electronic structure of PCPDTBT was measured by combining a high harmonic generation source and a time-of-flight spectrometer.</description><subject>Dynamic structural analysis</subject><subject>Dynamics</subject><subject>Electronic structure</subject><subject>Excitation</subject><subject>Harmonic generations</subject><subject>Photoelectron spectroscopy</subject><subject>Photovoltaic cells</subject><subject>Solar cells</subject><issn>1463-9076</issn><issn>1463-9084</issn><issn>1463-9084</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><recordid>eNqN0s1vFCEYBnBibOyHXrxrOBrjKAwMA8fN2mqTJnpQr4SPd1rqzDDCYDP_vWN33R7tiTfwyxPCA0IvKXlPCVMfnHAT4ZQJ8wSdUC5YpYjkTw9zK47Rac63hBDaUPYMHdct54Q35ATdnvfg5hTH4HCeU3FzSYD9MpohuIzDiA3u4x22ZvTXZsJT7JcB0mqLD-CxXfAcBqgS5Nj_XjemmzhH2IfiPN0P2cVpeY6OOtNneLFfz9D3i_Nv28_V1ZdPl9vNVeU4beeqI5b6uiXgrOSdsp0nVigKnFnmOkYa6RUIST0FBgK8aqXwtQSnhO2YMuwMvdvl5juYitVTCoNJi44m6I_hx0bHdK1L0Yy0smUrr_7Pf843uq4bzuTq3-z8lOKvAnnWQ8gO-t6MEEvWVLJGiFZS9QhKlCBcsnqlb3fUra-VE3SHe1Ci_7ast2L79b7lzYpf73OLHcAf6L9aV_BqB1J2h9OHb8L-AP9vrsI</recordid><startdate>2016</startdate><enddate>2016</enddate><creator>Cappel, Ute B</creator><creator>Plogmaker, Stefan</creator><creator>Terschlüsen, Joachim A</creator><creator>Leitner, Torsten</creator><creator>Johansson, Erik M. 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In this paper we study the electronic structure dynamics by direct pump-probe measurements of the excited electrons in such materials. Specifically, we carried out a time-resolved photoelectron spectroscopy (TRPES) study of the polymer PCPDTBT by combining an extreme ultraviolet (XUV) high harmonic generation source with a time-of-flight spectrometer. After excitation to either the 1st excited state or to a higher excited state, we follow how the electronic structure develops and relaxes on the electron binding energy scale. Specifically, we follow a less than 50 fs relaxation of the higher exited state and a 10 times slower relaxation of the 1st excited state. We corroborate the results using DFT calculations. Our study demonstrates the power of TRPES for studying photo-excited electron energetics and dynamics of solar cell materials.
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| source | Royal Society Of Chemistry Journals 2008-; Alma/SFX Local Collection |
| subjects | Dynamic structural analysis Dynamics Electronic structure Excitation Harmonic generations Photoelectron spectroscopy Photovoltaic cells Solar cells |
| title | Electronic structure dynamics in a low bandgap polymer studied by time-resolved photoelectron spectroscopy |
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