Dynamics in Electronically Excited States of Diketopyrrolopyrrole–Thiophene Conjugated Polymer Thin Films
Dynamics in Electronically Excited States of Diketopyrrolopyrrole–Thiophene Conjugated Polymer Thin Films
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二酮吡咯并吡咯噻吩共轭聚合物薄膜的电子激发态动力学
DOI：
10.1021/acs.jpcc.0c09169
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发表时间：
2021
影响因子：
3.7
通讯作者：
H. Zacharias
中科院分区：
文献类型：
--
作者：
T. Reiker;Z. Liu;C. Winter;N.F. Kleimeier;D. Zhang;H. Zacharias
基于二酮基吡咯吡咯(DPP)的共轭聚合物是各种高性能有机半导体的通用基础。合成了两种以DPP为电子受体的共轭聚合物。在第一种情况下，DPP聚合物是以季戊四烯(PDPP4T)为给体完成的；对于第二种给体-受体共轭聚合物，两个噻吩基已被噻吩基取代(PDPPTTT)。用时间分辨双光子光电子能谱研究了电子激发态的寿命。在2PPE谱的基础上，我们提出了在所确定的价带最大值和LUMO之间的四个空态。电子动能分辨寿命从几个100ps到1.4ps，也显示出10ps左右的较慢分量。退火后，高极化子态最低能电子的超快衰变在约20ps后终止。对于高能级，这也发生在PDPPTTT中。我们认为这与薄膜电荷输运性能的改善有关。
Conjugated polymers based on diketopyrrolopyrrole (DPP) are a versatile basis for a variety of high-performance organic semiconductors. Two conjugated polymers with DPP as an electron acceptor were prepared. The DPP-based polymers were completed with quaterthiophene (PDPP4T) as a donor in the first case; for the second donor–acceptor conjugated polymer, two thiophenes have been replaced by thieno-thiophene (PDPPTTT). Time-resolved two-photon photoemission spectroscopy is employed to study the lifetimes of electronically excited states. On the basis of the 2PPE spectra, we propose four unoccupied states between the determined valence band maximum and LUMO of the thin films. Electron kinetic energy resolved lifetimes range from a few 100 fs up to 1.4 ps and show also a slower component around 10 ps. After annealing, the ultrafast decay of the lowest-energy electrons in the upper polaron state terminated after about 20 ps. This happens in PDPPTTT for the high-energy level as well. We suggest that it is connected with improved charge transport properties of the film.
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