期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 32, 页码 26937-26947出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b08504
关键词
multicycle solution coating; DMF; additive; perovskite; high efficiency
资金
- National Natural Science Foundation of China [51627803, 51402348, 11474333, 91433205, 51421002, 51372270]
- Knowledge Innovation Program of the Chinese Academy of Sciences
DMF as an additive has been employed in FAI/MAI/IPA (FA= CH2(NH2)(2), MA = CH3NH3, IPA = isopropanol) solution for a two-step multicycle spin-coating method in order to prepare high-quality FA(x)MA(1-x)PbI(2.55)Br(0.45) perovskite films. Further investigation reveals that the existence of DMF in the FAI/MAI/IPA solution can facilitate perovskite conversion, improve the film morphology, and reduce crystal defects, thus enhancing charge-transfer efficiency. By optimization of the DMF amount and spin-coating cycles, compact, pinhole-free perovskite films are obtained. The nucleation mechanisms of perovskite films in our multicycle spin-coating process are suggested; that is, the introduction of DMF in the spin-coating FAI/MAI/IPA solution can lead to the formation of an amorphous phase PbX(2-)AI-DMSO-DMF (X = I, Br; A = FA, MA) instead of intermediate phase (MA)(2)Pb(3)I(8)2DMSO. This amorphous phase, similar to that in the one-step method, can help FAI/MAI penetrate into the PbI2 framework to completely convert into the perovskite. As high as 20.1% power conversion efficiency (PCE) has been achieved with a steady-state PCE of 19.1%. Our work offers a simple repeatable method to prepare high-quality perovskite films for high-performance PSCs and also help further understand the perovskite-crystallization process.
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