期刊
ADVANCED OPTICAL MATERIALS
卷 7, 期 8, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201801776
关键词
CsPbBr3-fullerene; exciton diffusion; perovskite nanocrystals; perovskite photodetector; ultrafast exciton dissociation
资金
- Bavarian State Ministry of Science, Research, and Arts through the grant Solar Technologies go Hybrid (SolTech)
- German Research Foundation (DFG) through the Excellence Cluster e-conversion
- European Union [754388]
- LMU Munich's Institutional Strategy LMUexcellent within the framework of the German Excellence Initiative [ZUK22]
- Marie Curie Actions (MSCA) [754388] Funding Source: Marie Curie Actions (MSCA)
Solution-processable perovskite nanocrystals (NCs) are gaining increasing interest in the field of photovoltaics because of their enhanced stability compared to their thin-film counterparts. However, the charge transfer dynamics in perovskite NC based light-harvesting systems are not well understood. By applying femtosecond differential transmission (DT) spectroscopy the photoinduced charge transfer from inorganic perovskite CsPbBr3 NCs to the fullerene derivative phenyl-C61-butyric acid methyl ester (PCBM) is investigated for two fundamentally different architectures, namely layer-by-layer heterostructures and blend structures. By varying the thickness of the NC layer on top of the PCBM in the layer-by-layer heterostructure, an exciton diffusion length of 290 +/- 28 nm for CsPbBr3 NC is extracted. The diffusion process is followed by an ultrafast exciton dissociation (within 200 fs) at the CsPbBr3 NC/PCBM interface. In blend structures an overall faster charge transfer process is observed. Furthermore, photoconductivity measurements on a blend structure-based photodetector reveal an effective charge extraction from the active layer resulting in a high photosensitivity. DT measurements on this blend structure including adjacent electron- or hole-transport layers give insight into the extraction process and suggest a certain degree of phase segregation, which assists the charge collection.
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