期刊
ACS NANO
卷 12, 期 5, 页码 4968-4975出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b02079
关键词
metal-organic frameworks; nanocrystals; titanium oxo-cluster; flexible perovskite solar cells; electron transporting layers
类别
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2016R1C1B2011016, 2016R1C1B1010781]
- Sookmyung Women's University Research Grant [1-1703-2015, 1-1603-2037]
- Global Ph.D. Fellowship Program through NRF [2017H1A2A1044712]
- National Research Foundation of Korea [2016R1C1B1010781, 2017H1A2A1044712, 2016R1C1B2011016] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Flexible perovskite solar cells (PSCs) have attracted considerable attention due to their excellent performance, low-cost, and great potential as an energy supplier for soft electronic devices. In particular, the design of charge transporting layers (CTLs) is crucial to the development of highly efficient and flexible PSCs. Herein, nano crystalline Ti-based metal-organic framework (nTi-MOF) particles are synthesized to have ca. 6 nm in diameter. These are then well-dispersed in alcohol solvents in order to generate electron transporting layers (ETLs) in PSCs under ambient temperatures using a spin-coating process. The electronic structure of nTi-MOF ETL is found to be suitable for charge injection and transfer from the perovskite to the electrodes. The combination of a [6,6]-phenyl-C-61-butyric acid (PCBM) into the nTi-MOF ETL provides for efficient electron transfer and also suppresses direct contact between the perovskite and the electrode. This results in impressive power conversion efficiencies (PCEs) of 18.94% and 17.43% for rigid and flexible devices, respectively. Moreover, outstanding mechanical stability is retained after 700 bending cycles at a bending radius (r) of 10 mm.
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