Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 35, Pages 39567-39577Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c09651
Keywords
Ruddlesden-Popper phase; Dion-Jacobson phase; halide perovskite; EDA; photodetector; flexible device
Funding
- Research Grants Council of Hong Kong SAR, China [CityU 11204618, T42-103/16-N]
- National Natural Science Foundation of China [51672229]
- Science Technology and Innovation Committee of Shenzhen Municipality [JCYJ20170818095520778]
- Shenzhen Research Institute, City University of Hong Kong
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Quasi-2D halide perovskites, especially the Ruddlesden-Popper perovskites (RPPs), have attracted great attention because of their promising properties for optoelectronics; however, there are still serious drawbacks, such as inefficient charge transport, poor stability, and unsatisfactory mechanical flexibility, restricting further utilization in advanced technologies. Herein, high-quality quasi-2D halide perovskite thin films are successfully synthesized with the introduction of the unique bication ethylenediammonium (EDA) via a one-step spin-coating method. This bication EDA, with short alkyl chain length, can not only substitute the typically bulky and weakly van der Waals-interacted organic bilayer spacer cations forming the novel Dion-Jacobson phase to enhance the mechanical flexibility of the quasi-2D perovskite (e.g., EDA(MA)(n-1)PbnI3n+1; MA = CH3NH3+) but also serve as a normal cation to achieve the more intact films (e.g., (iBA)(2)(MA)(3-2x)(EDA)(x)Pb4I13). When fabricated into photodetectors, these optimized EDA-based perovskites deliver an excellent responsivity of 125 mA/W and a fast response time down to 380 mu s under 532 nm irradiation. More importantly, the device with the Dion-Jacobson phase perovskite can be bent down to a radius of 2 mm and processed with 10,000 cycles of the bending test without any noticeable performance degradation because of its superior structure to RPPs. Besides, these films do not exhibit any material deterioration after ambient storage for 30 days. All these performance parameters are already comparable or even better than those of the state-of-the-art RPPs recently reported. This work provides valuable design guidelines of the quasi-2D perovskites to obtain high-performance flexible photodetectors for next-generation optoelectronics.
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