TY - JOUR
T1 - Unraveling the Growth of Hierarchical Quasi-2D/3D Perovskite and Carrier Dynamics
AU - Li, Liang
AU - Zhou, Ning
AU - Chen, Qi
AU - Shang, Qiuyu
AU - Zhang, Qing
AU - Wang, Xindong
AU - Zhou, Huanping
N1 - Publisher Copyright:
© 2018 American Chemical Society.
PY - 2018/3/1
Y1 - 2018/3/1
N2 - The construction of hybrid perovskites (both two-dimensional (2D) and three-dimensional (3D)) has attracted intensive research interest recently. Here, a facile, two-step consecutive deposition method was developed for the first time to grow a hierarchical quasi-2D/3D perovskite superstructure, with an oriented quasi-2D ((BA)2(MA)-rfnet-1PbnI3n+1) perovskite nanosheet (NS) perpendicularly aligned on 3D perovskites. The superstructures are found to be mixtures of multiple perovskite phases, with n = 2, 3, 4 and 3D perovskite; however, the n value was naturally increased from top to the bottom, which is distinct from many other works. We found that the concentration gradient, namely, the initial ratio and amount of BAI/MAI, collectively contributes to the spatially confined nucleation and growth of oriented quasi-2D superstructure perovskite on 3D perovskites. An efficient charge carrier transfer was demonstrated from small-n to large-n phases in this perovskite superstructure, indicating a different type of energy funnel from top to bottom.
AB - The construction of hybrid perovskites (both two-dimensional (2D) and three-dimensional (3D)) has attracted intensive research interest recently. Here, a facile, two-step consecutive deposition method was developed for the first time to grow a hierarchical quasi-2D/3D perovskite superstructure, with an oriented quasi-2D ((BA)2(MA)-rfnet-1PbnI3n+1) perovskite nanosheet (NS) perpendicularly aligned on 3D perovskites. The superstructures are found to be mixtures of multiple perovskite phases, with n = 2, 3, 4 and 3D perovskite; however, the n value was naturally increased from top to the bottom, which is distinct from many other works. We found that the concentration gradient, namely, the initial ratio and amount of BAI/MAI, collectively contributes to the spatially confined nucleation and growth of oriented quasi-2D superstructure perovskite on 3D perovskites. An efficient charge carrier transfer was demonstrated from small-n to large-n phases in this perovskite superstructure, indicating a different type of energy funnel from top to bottom.
UR - http://www.scopus.com/inward/record.url?scp=85042699529&partnerID=8YFLogxK
U2 - 10.1021/acs.jpclett.7b03294
DO - 10.1021/acs.jpclett.7b03294
M3 - Article
C2 - 29432017
AN - SCOPUS:85042699529
SN - 1948-7185
VL - 9
SP - 1124
EP - 1132
JO - Journal of Physical Chemistry Letters
JF - Journal of Physical Chemistry Letters
IS - 5
ER -