期刊
SMALL
卷 16, 期 42, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202003098
关键词
2D perovskites; cyclohexanediamine; DJ phase; slantwise alignment; stability
类别
资金
- Research Grants Council of Hong Kong [T23-407/13-N, 14204616, 14203018, N_CUHK438/18]
- CUHK Group Research Scheme
- CUHK Postdoctoral Fellowship
- Innovation and Technology Commission, Hong Kong SAR Government [ITS/088/17]
- Research Grant Council of Hong Kong [24306318]
- Guangdong Science and Technology Program [2020B121201003, 2019ZT08L075, 2019QN01L118]
The crystalline orientation and phase distribution are two important parameters for high-performance 2D perovskite solar cells. Therefore, it is essential to understand how the structure of spacer ligands influences the orientation and phase distribution of resulting 2D perovskite films. In this work, a new member of Dion-Jacobson (DJ) phase 2D perovskites based on trans-1,4-cyclohexanediamine (CHDA) is demonstrated and it is found that the crystalline orientation is self-aligned spontaneously, which is different from the well-known graded distribution in controlled sample with its isomer 1,6-diaminohexane (HDA) as spacer ligand. Grazing incident X-ray scattering suggests that the exact alignment is strongly slantwise to the substrate while it is still beneficial for charge transfer along the vertical structure of devices. The devices can achieve high efficiency up to 15.01% for (CHDA)MA(3)Pb(4)I(13)(n = 4), one of the highest efficiencies reported by now. The encapsulated (CHDA)MA(3)Pb(4)I(13)(n = 4) devices can retain 80.7% efficiency for 270 min under continuous maximum power point tracking. (CHDA)MA(3)Pb(4)I(13)(n = 4) devices can retain 96.5% efficiency under 60 degrees C and 74.4% efficiency under 70 degrees C heating for 68 h. The results demonstrate the slantwise aligned DJ phase perovskite solar cells with excellent stability.
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