Premium
The Second Spacer Cation Assisted Growth of a 2D Perovskite Film with Oriented Large Grain for Highly Efficient and Stable Solar Cells
Author(s) -
Lian Xiaomei,
Chen Jiehuan,
Qin Minchao,
Zhang Yingzhu,
Tian Shuoxun,
Lu Xinhui,
Wu Gang,
Chen Hongzheng
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201902959
Subject(s) - nucleation , materials science , grain size , perovskite (structure) , crystal (programming language) , fabrication , crystallography , chemical engineering , crystal growth , mineralogy , composite material , chemistry , medicine , alternative medicine , organic chemistry , pathology , computer science , programming language , engineering
The fabrication of high‐quality film with large grains oriented along the direction of film thickness is important for 2D Ruddlesden–Popper perovskite‐based solar cells (PVSCs). High‐quality 2D BA 2 MA n −1 Pb n I 3 n +1 (BA + =butylammonium, MA + =methylammonium, n =5) perovskite films were fabricated with a grain size of over 1 μm and preferential orientation growth by introducing a second spacer cation (SSC + ) into the precursor solution. Dynamic light scattering showed that SSC + addition can induce aggregation in the precursor solution. The precursor aggregates are favorable for the formation of large crystal grains by inducing nucleation and decreasing the nucleation sites. Applying phenylethylammonium as SSC + , the optimized inverted planar PVSCs presented a maximum PCE of 14.09 %, which is the highest value of the 2D BA 2 MA n −1 Pb n I 3 n +1 ( n =5) PVSCs. The unsealed device shows good moisture stability by maintaining around 90 % of its initially efficiency after 1000 h exposure to air (Hr=25±5 %).