Journal
ADVANCED ENERGY MATERIALS
Volume 12, Issue 3, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202103406
Keywords
charge-carrier dynamics; charge-transfer states; different time scales; double-cable polymers; single-component OSCs
Categories
Funding
- China Scholarship Council (CSC)
- Erlangen Graduate School in Advanced Optical Technologies (SAOT)
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [182849149-SFB 953, INST 90/917, INST 90/1093-1]
- Deutsche Forschungsgemeinschaft [FKZ BR 4031/21-1]
- Aufbruch Bayern initiative of the state of Bavaria (EnCN)
- Bavarian Initiative Solar Technologies go Hybrid (SolTech)
- Bavarian State Government [44-6521a/20/4]
- MOST [2017YFA0204702, 2018YFA0208504]
- NSFC of China [51773207, 91633301]
- Hong Kong Scholars Program [XJ2020051]
- Aufbruch Bayern initiative of the state of Bavaria (SFF)
- Projekt DEAL
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In recent years, single-component organic solar cells have seen significant improvements in efficiency, but many materials lack thorough investigation on their photophysics, specifically regarding charge-carrier dynamics. This information is crucial for a better understanding and further enhancements in performance.
Single-component organic solar cells (SCOSCs) have witnessed great improvement during the last few years with the champion efficiency jumping from the previous 2-3% to currently 6-11% for the representative material classes. However, the photophysics in many of these materials has not been sufficiently investigated, lacking essential information regarding charge-carrier dynamics as a function of microstructure, which is highly demanded for a better understanding and potential guidance for further improvements. In this work, for the first time, the charge-carrier dynamics of a representative double-cable polymer, which achieves efficiencies of over 6% as an active layer in SCOSCs, is investigated across seven orders of magnitude in time scale, from fs-ps charge generation to ns-mu s charge recombination processes. Specific emphasis is placed on understanding the impact of thermal post-treatment on the charge dissociation and recombination dynamics. Annealing the photoactive layer at 230 degrees C results in the highest photovoltaic performance because of efficient charge generation in parallel to suppressed recombination. This work intends to present a complete picture of the charge-carrier dynamics in SCOSCs using the representative double-cable polymer PBDBPBI-Cl.
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