TY - JOUR
T1 - Liquid-Phase Transfer of Organic–Inorganic Halide Perovskite Films for TEM Investigation and Planar Heterojunction Fabrication
AU - Guo, Shuai
AU - Zhang, Xiangzhao
AU - Hao, Mingwei
AU - Duan, Tianwei
AU - Wang, Weizhen
AU - Li, Zhimin
AU - Liu, Guiwu
AU - Cai, Songhua
AU - Zhou, Yuanyuan
N1 - Publisher copyright:
© 2023 The Authors. Advanced Optical Materials published by Wiley-VCH GmbH
PY - 2024/3/14
Y1 - 2024/3/14
N2 - Organic–inorganic halide perovskites (OIHPs) show high promise in optical and electronic applications such as solar cells, light-emitting diodes, and nonlinear optics. However, the fundamental knowledge of the atomic-scale microstructures in OIHP thin films is limited due to the challenge in characterizing them using transmission electron microscopy (TEM). Here a solution-phase “release-and-transfer” method is demonstrated, which entails the lifting of OIHP films from their original substrates while maintaining the film integrity, followed by a sequential transfer onto a TEM grid. The freestanding nature of the OIHP films with a nanoscale thickness, prepared as such, allows a direct TEM observation in the plan view, complementing those typical cross-sectional views enabled by focus-ion-beam specimen fabrication. Using low-dose scanning TEM, the atomic-scale microstructure of transferred OIHP films is confirmed to be generally maintained, while the microstrain existing in original films is largely relaxed. This “release-and-transfer” method is generic to both standard 3D and low-dimensional OIHPs. Based on a simple layer-by-layer transfer, the fabrication of a 2D–3D planar heterojunction with a good interfacial contact and optoelectronic properties is achieved. This unique methodology offers new opportunities to accelerate the fundamental and practical developments of OIHP materials and devices.
AB - Organic–inorganic halide perovskites (OIHPs) show high promise in optical and electronic applications such as solar cells, light-emitting diodes, and nonlinear optics. However, the fundamental knowledge of the atomic-scale microstructures in OIHP thin films is limited due to the challenge in characterizing them using transmission electron microscopy (TEM). Here a solution-phase “release-and-transfer” method is demonstrated, which entails the lifting of OIHP films from their original substrates while maintaining the film integrity, followed by a sequential transfer onto a TEM grid. The freestanding nature of the OIHP films with a nanoscale thickness, prepared as such, allows a direct TEM observation in the plan view, complementing those typical cross-sectional views enabled by focus-ion-beam specimen fabrication. Using low-dose scanning TEM, the atomic-scale microstructure of transferred OIHP films is confirmed to be generally maintained, while the microstrain existing in original films is largely relaxed. This “release-and-transfer” method is generic to both standard 3D and low-dimensional OIHPs. Based on a simple layer-by-layer transfer, the fabrication of a 2D–3D planar heterojunction with a good interfacial contact and optoelectronic properties is achieved. This unique methodology offers new opportunities to accelerate the fundamental and practical developments of OIHP materials and devices.
KW - halide perovskites
KW - microstructure
KW - scanning transmission electron microscopy
KW - solar cells
KW - transfer
UR - http://www.scopus.com/inward/record.url?scp=85173772823&partnerID=8YFLogxK
U2 - 10.1002/adom.202301255
DO - 10.1002/adom.202301255
M3 - Journal article
SN - 2195-1071
VL - 12
JO - Advanced Optical Materials
JF - Advanced Optical Materials
IS - 8
M1 - 2301255
ER -