期刊
NANO ENERGY
卷 90, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2021.106521
关键词
Perovskite solar cells; 2D perovskites; Dopant-free; Hole-transporting materials; Donor-acceptor polymers
类别
资金
- National Natural Science Foundation of China [51973223]
- China Postdoctoral Science Foundation [2019TQ0318]
- Liaoning Revitalization Talents Program [XLYC1807231]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB17000000]
- DICP [I202011]
Introducing a 2D perovskite layer at the interface of 3D perovskite and a dopant-free polymeric HTM can significantly enhance the efficiency and stability of PSCs, offering a promising solution to the stability issue faced by traditional PSCs.
Dopant-free hole transporting materials (HTMs) are promising to tackle the stability issue of perovskite solar cells (PSCs) compared to traditional ones requiring hygroscopic additives. In addition to developing more dopant-free HTMs and increasing their hole extraction/transport ability, interfacial issues between perovskite and dopantfree HTM also remarkably impact on the PSC performance, which, however, have been less concerned. Herein, we introduce a 2D perovskite layer to the interface of 3D perovskite and a dopant-free polymeric HTM to improve the device efficiency and stability. The 2D perovskite layer can increase hole transports by offering a gradient energy-level alignment, decrease defects density, and improve contact at the interface, which are more efficiently when the 2D perovskite is prepared from a fluorine-containing organic cation. Accordingly, a device efficiency of 20.5% is obtained, quite impressive for dopant-free HTM-based 2D-3D PSCs. In particular, these devices without encapsulation exhibit excellent stability under high humidity (85%), heating (80 degrees C), or light illumination (1-sun), ascribed to double protections from both 2D perovskite layer and dopant-free polymer. This work offers a promising method to enhance the efficiency and stability of dopant-free HTM-based PSCs by introducing a 2D perovskite layer at the interface.
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