TY - JOUR
T1 - Direct-Indirect Transition of Pressurized Two-Dimensional Halide Perovskite
T2 - Role of Benzene Ring Stack Ordering
AU - Gao, Chaofeng
AU - Li, Ruiping
AU - Li, Yiran
AU - Wang, Rong
AU - Wang, Meng
AU - Gan, Zhixing
AU - Bai, Ligang
AU - Liu, Yucheng
AU - Zhao, Kui
AU - Liu, Shengzhong Frank
AU - Cheng, Yingchun
AU - Huang, Wei
N1 - Publisher Copyright:
Copyright © 2019 American Chemical Society.
PY - 2019/10/3
Y1 - 2019/10/3
N2 - Two-dimensional (2D) hybrid organic-inorganic metal halide perovskites (HOIPs) with considerably hydrophobic phenyl ethylammonium (PEA) organic cations have been used in highly efficient solar cells and LEDs, which are stable and enjoy a long lifetime, even when exposed to moisture. Different from other 2D HOIPs with alkyl amine cations, a benzene ring is present in the PEA cation. Until recently, an understanding of the effects of PEA on the structural, electronic, and optical properties of 2D HOIPs under pressure has remained limited. We find that there is a direct-indirect band gap transition at around 5.8 GPa and that the direct band gap recovers when the pressure is released. The stacking order of the benzene rings in the PEA cation plays a critical role in the mechanical and electronic properties. Our present work demonstrates that 2D HOIPs with organic cations containing benzene rings prove highly attractive for use in flexible optoelectronics.
AB - Two-dimensional (2D) hybrid organic-inorganic metal halide perovskites (HOIPs) with considerably hydrophobic phenyl ethylammonium (PEA) organic cations have been used in highly efficient solar cells and LEDs, which are stable and enjoy a long lifetime, even when exposed to moisture. Different from other 2D HOIPs with alkyl amine cations, a benzene ring is present in the PEA cation. Until recently, an understanding of the effects of PEA on the structural, electronic, and optical properties of 2D HOIPs under pressure has remained limited. We find that there is a direct-indirect band gap transition at around 5.8 GPa and that the direct band gap recovers when the pressure is released. The stacking order of the benzene rings in the PEA cation plays a critical role in the mechanical and electronic properties. Our present work demonstrates that 2D HOIPs with organic cations containing benzene rings prove highly attractive for use in flexible optoelectronics.
UR - https://www.scopus.com/pages/publications/85072903802
U2 - 10.1021/acs.jpclett.9b02604
DO - 10.1021/acs.jpclett.9b02604
M3 - 文章
C2 - 31495169
AN - SCOPUS:85072903802
SN - 1948-7185
VL - 10
SP - 5687
EP - 5693
JO - Journal of Physical Chemistry Letters
JF - Journal of Physical Chemistry Letters
IS - 19
ER -