TY - JOUR
T1 - Unveiling the guest effect of N-butylammonium iodide towards efficient and stable 2D-3D perovskite solar cells through sequential deposition process
AU - Wang, Yafei
AU - Xu, Hao
AU - Wang, Feng
AU - Liu, Detao
AU - Chen, Hao
AU - Zheng, Hualin
AU - Ji, Long
AU - Zhang, Peng
AU - Zhang, Ting
AU - Chen, Zhi David
AU - Wu, Jiang
AU - Chen, Li
AU - Li, Shibin
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2020/7/1
Y1 - 2020/7/1
N2 - Improving the stability of hybrid organic-inorganic halide perovskite materials is urgent and essential for their applications in optoelectronic devices. Here, we introduce n-butylammonium iodide (BAI) into lead-iodide crystals as guest molecules. As a result of guest effect, only a small amount BA2PbI4 two-dimensional (2D) perovskite (n = 1) is formed in PbI2-BAI films. Most of BAI crystals efficiently cut and squeeze the lattice network of lead iodide. The better orientation of 2D lead iodide crystals is obtained via this guest effect. In the following sequential deposition process, that BAI re-dissolve in MAI isopropanol (IPA) solution leads to a mesoporous structure of PbI2 and introduces a 2D perovskite (n = 2) protect layer in 3D MAPbI3 after annealing. Finally, the morphology, crystallization and stability of CH3NH3PbI3 are simultaneously improved by the insertion of BAI guest molecules. Consequently, CH3NH3PbI3 PSCs with an optimized cutting behavior exhibited a power conversion efficiency of 18% and significantly improved the stability.
AB - Improving the stability of hybrid organic-inorganic halide perovskite materials is urgent and essential for their applications in optoelectronic devices. Here, we introduce n-butylammonium iodide (BAI) into lead-iodide crystals as guest molecules. As a result of guest effect, only a small amount BA2PbI4 two-dimensional (2D) perovskite (n = 1) is formed in PbI2-BAI films. Most of BAI crystals efficiently cut and squeeze the lattice network of lead iodide. The better orientation of 2D lead iodide crystals is obtained via this guest effect. In the following sequential deposition process, that BAI re-dissolve in MAI isopropanol (IPA) solution leads to a mesoporous structure of PbI2 and introduces a 2D perovskite (n = 2) protect layer in 3D MAPbI3 after annealing. Finally, the morphology, crystallization and stability of CH3NH3PbI3 are simultaneously improved by the insertion of BAI guest molecules. Consequently, CH3NH3PbI3 PSCs with an optimized cutting behavior exhibited a power conversion efficiency of 18% and significantly improved the stability.
KW - 2D-3D perovskite
KW - Guest effect
KW - Ion exchange
KW - Lattice compression
KW - Sequential deposition
KW - Stability
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U2 - 10.1016/j.cej.2019.123589
DO - 10.1016/j.cej.2019.123589
M3 - Article
AN - SCOPUS:85077164959
SN - 1385-8947
VL - 391
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
M1 - 123589
ER -