Entwicklung von neuen organischen Halbleitermaterialien und innovativen kombinatorischen Charakterisierungsmethoden für die Entwicklung von effizienten, gedruckten Polymer-Solarzellen
Experimentelle Physik der kondensierten Materie
Herstellung und Eigenschaften von Funktionsmaterialien
Organische Molekülchemie - Synthese, Charakterisierung
Physikalische Chemie von Festkörpern und Oberflächen, Materialcharakterisierung
Zusammenfassung der Projektergebnisse
The joint Sino-German research project carried out by the FAU and SCUT teams has focused on the development of advanced organic solar cells (OSCs) towards excellent efficiency and device stability. A certified record efficiency of over 12% has been successfully achieved by the joint research team for OSCs with an active area of 1 cm2. Detailed loss analysis suggested that this type of OSCs has the potential to research higher efficiency up to 14%, when the non-radiative VOC loss can be further minimized while maintaining the high EQE over the entire absorption region. The findings demonstrated in this project have contributed to the recently rapid efficiency evolution for OSCs based on non-fullerene acceptors (NFAs). In addition to the device performance, the microstructure-related device instability has been in-depth characterized and analysed for OSCs based on various acceptors, including fullerene acceptors and NFAs. A universal concept has been developed by adding a solid additive, piperazine, into the polymer:PCBM blend to overcome their microstructural instability. In particular for OSCs based on the PBDB-T:IT-4F system, a very promising operational stability of over 10 years was demonstrated. The residual degradation mechanisms were analysed, quantified and concepts to overcome them were proposed. Compared to the inorganic counterparts, such as silicon and GaAs solar cells, the still lower stability of OSCs could be attributed in many cases to the relatively low miscibility or compatibility between state-of-the-art donor and acceptor materials, which cause demixing or phase separation in the mixed amorphous regions. For instance, due to the diffusion of PCBM within a polymer matrix, we could demonstrate for the first time that demixing in the amorphous regions of PCE11:PCBM reduced donor/acceptor interfaces and hence photocurrent generation. In contrast, for NFA-based OSCs, small‐scale isolated NFA domains were found as a result of polymer aggregation/reorganization and low diffusion coefficient of NFAs. These isolated domains act as morphological traps for electron transport and cause long‐term FF degradation (1st order degradation). In order to achieve stable and highperformance OSCs under operational conditions, it is essential to design all components such that their inevitable mixed regions are stable. This can be achieved by using highly compatible materials, where no demixing occurs, or materials with hindered diffusion, e.g., where a very low diffusion constant delays phase separation.
Projektbezogene Publikationen (Auswahl)
- Science, 2017, 358, 1192-1197
Y. Hou, X. Du, S. Scheiner, D. P. McMeekin, Z. Wang, N. Li, M. S. Killian, H. Chen, M. Richter, I. Levchuk, N. Schrenker, E. Spiecker, T. Stubhan, N. A. Luechinger, A. Hirsch, P. Schmuki, H.-P. Steinrück, R. H. Fink, M. Halik, H. J. Snaith and C. J. Brabec
(Siehe online unter https://doi.org/10.1126/science.aao5561) - Energy & Environmental Science, 2018, 11, 1355-1361
N. Li, I. McCulloch and C. J. Brabec
(Siehe online unter https://doi.org/10.1039/C8EE00151K) - Nat Commun, 2018, 9, 5335
C. Xie, T. Heumuller, W. Gruber, X. Tang, A. Classen, I. Schuldes, M. Bidwell, A. Spath, R. H. Fink, T. Unruh, I. McCulloch, N. Li and C. J. Brabec
(Siehe online unter https://doi.org/10.1038/s41467-018-07807-5) - Nature Energy, 2018, 3, 1051-1058
B. Fan, X. Du, F. Liu, W. Zhong, L. Ying, R. Xie, X. Tang, K. An, J. Xin, N. Li, W. Ma, C. J. Brabec, F. Huang and Y. Cao
(Siehe online unter https://doi.org/10.1038/s41560-018-0263-4) - Advanced Energy Materials, 2019, 9, 1900409
Y. He, T. Heumüller, W. Lai, G. Feng, A. Classen, X. Du, C. Liu, W. Li, N. Li and C. J. Brabec
(Siehe online unter https://doi.org/10.1002/aenm.201900409) - Energy & Environmental Science, 2019, 12, 1078-1087
C. Zhang, T. Heumueller, S. Leon, W. Gruber, K. Burlafinger, X. Tang, J. D. Perea, I. Wabra, A. Hirsch, T. Unruh, N. Li and C. J. Brabec
(Siehe online unter https://doi.org/10.1039/C8EE03780A) - Joule, 2019, 3, 215-226
X. Du, T. Heumueller, W. Gruber, A. Classen, T. Unruh, N. Li and C. J. Brabec
(Siehe online unter https://doi.org/10.1016/j.joule.2018.09.001) - Nature Communications, 2019, 10, 4100
B. Fan, W. Zhong, L. Ying, D. Zhang, M. Li, Y. Lin, R. Xia, F. Liu, H.-L. Yip, N. Li, Y. Ma, C. J. Brabec, F. Huang and Y. Cao
(Siehe online unter https://doi.org/10.1038/s41467-019-12132-6) - Adv Mater, 2020, 32, e1908305
X. Du, T. Heumueller, W. Gruber, O. Almora, A. Classen, J. Qu, F. He, T. Unruh, N. Li and C. J. Brabec
(Siehe online unter https://doi.org/10.1002/adma.201908305)
