期刊
ADVANCED FUNCTIONAL MATERIALS
卷 31, 期 49, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202104981
关键词
carrier mobilities; grain boundaries; ion migration; lead-free double perovskites; thin film transistors
类别
资金
- Cambridge Trust
- Chinese Scholarship Council
- Royal Academy of Engineering [RF\201718\1701]
- Royal Society through the Newton Alumni Fellowship [SERB-SRG/2020/001641]
- DAE funding through NISER
- Peridot Technologies, India
- EPSRC [EP/R025193/1]
- SUNRISE project [EP/P032591/1]
- Royal Society
- Ministry of Education in the Taiwan Government
- Downing College Cambridge
- EPSRC [EP/R025193/1, EP/P032591/1] Funding Source: UKRI
In the study, it was found that grain boundaries act as main nonradiative recombination sites and ion transport channels in Cs2AgBiBr6 thin films. Additionally, a positive correlation between carrier mobility and temperature was identified, explaining the discrepancy in performance between single crystals and thin film counterparts.
Halide double perovskites have gained significant attention, owing to their composition of low-toxicity elements, stability in air, and recent demonstrations of long charge-carrier lifetimes that can exceed 1 mu s. In particular, Cs2AgBiBr6 is the subject of many investigations in photovoltaic devices. However, the efficiencies of solar cells based on this double perovskite are still far from the theoretical efficiency limit of the material. Here, the role of grain size on the optoelectronic properties of Cs2AgBiBr6 thin films is investigated. It is shown through cathodoluminescence measurements that grain boundaries are the dominant nonradiative recombination sites. It also demonstrates through field-effect transistor and temperature-dependent transient current measurements that grain boundaries act as the main channels for ion transport. Interestingly, a positive correlation between carrier mobility and temperature is found, which resembles the hopping mechanism often seen in organic semiconductors. These findings explain the discrepancy between the long diffusion lengths >1 mu m found in Cs2AgBiBr6 single crystals versus the limited performance achieved in their thin film counterparts. This work shows that mitigating the impact of grain boundaries will be critical for these double perovskite thin films to reach the performance achievable based on their intrinsic single-crystal properties.
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