Strain-relaxed tetragonal MAPbI3 results in efficient mesoporous solar cells

Tao Ye; Kai Wang; Shaoyang Ma; Congcong Wu; Yuchen Hou; Dong Yang; Ke Wang; Shashank Priya

doi:10.1016/j.nanoen.2021.105788

Strain-relaxed tetragonal MAPbI₃ results in efficient mesoporous solar cells

Tao Ye, Kai Wang, Shaoyang Ma, Congcong Wu, Yuchen Hou, Dong Yang, Ke Wang, Shashank Priya

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

Abstract

In mesoporous organo-halide perovskite solar cells, the coexistence of tetragonal phase and cubic phase in the perovskite layer is found to result in strained crystal structure at the mesoporous TiO₂ (mp-TiO₂)/perovskite heterointerface. This results in structural defects pinholes, grain boundaries, and interfacial porosity which is detrimental towards photovoltaic performance and device stability. The strain at the interface originates from the lattice mismatch between the mp-TiO₂ nanoparticles (NPs) and perovskite. Here, a transformative approach is demonstrated to realize relaxed and high purity tetragonal phase MAPbI₃ (RP) near the mp-TiO₂ interface region. This approach involves inserting a ~2 nm lattice matched buffer layer of cubic CsPbBr₃ between mp-TiO₂ NPs and MAPbI₃, which serves as a template for epitaxial growth for top MAPbI₃. The solar cell with relaxed MAPbI₃ shows a power conversion efficiency (PCE) of 22.12% with significantly enhanced environmental, light, and thermal stability.

Original language	English (US)
Article number	105788
Journal	Nano Energy
Volume	83
DOIs	https://doi.org/10.1016/j.nanoen.2021.105788
State	Published - May 2021
Externally published	Yes

Bibliographical note

Funding Information:
S.M. acknowledges the support from “the Fundamental Research Funds for the Central Universities ” ( 2020RC017 ). T.Y. acknowledges the support from Department of Energy through the STTR program. D.Y. acknowledges the support from Army RIF program . K.W. and Y.H. acknowledge the support from Air Force Office of Scientific Research (award number FA9550-17-1-0341 ). S.P. acknowledges the support through the Office of Naval Research through award number N00014161304 .

Publisher Copyright:
© 2021 Elsevier Ltd

Keywords

Lattice match
Mesoporous perovskite solar cell
Phase coexistence
Pure tetragonal phase
Strain

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This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.nanoen.2021.105788

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title = "Strain-relaxed tetragonal MAPbI3 results in efficient mesoporous solar cells",

abstract = "In mesoporous organo-halide perovskite solar cells, the coexistence of tetragonal phase and cubic phase in the perovskite layer is found to result in strained crystal structure at the mesoporous TiO2 (mp-TiO2)/perovskite heterointerface. This results in structural defects pinholes, grain boundaries, and interfacial porosity which is detrimental towards photovoltaic performance and device stability. The strain at the interface originates from the lattice mismatch between the mp-TiO2 nanoparticles (NPs) and perovskite. Here, a transformative approach is demonstrated to realize relaxed and high purity tetragonal phase MAPbI3 (RP) near the mp-TiO2 interface region. This approach involves inserting a ~2 nm lattice matched buffer layer of cubic CsPbBr3 between mp-TiO2 NPs and MAPbI3, which serves as a template for epitaxial growth for top MAPbI3. The solar cell with relaxed MAPbI3 shows a power conversion efficiency (PCE) of 22.12% with significantly enhanced environmental, light, and thermal stability.",

keywords = "Lattice match, Mesoporous perovskite solar cell, Phase coexistence, Pure tetragonal phase, Strain",

author = "Tao Ye and Kai Wang and Shaoyang Ma and Congcong Wu and Yuchen Hou and Dong Yang and Ke Wang and Shashank Priya",

note = "Funding Information: S.M. acknowledges the support from “the Fundamental Research Funds for the Central Universities ” ( 2020RC017 ). T.Y. acknowledges the support from Department of Energy through the STTR program. D.Y. acknowledges the support from Army RIF program . K.W. and Y.H. acknowledge the support from Air Force Office of Scientific Research (award number FA9550-17-1-0341 ). S.P. acknowledges the support through the Office of Naval Research through award number N00014161304 . Publisher Copyright: {\textcopyright} 2021 Elsevier Ltd",

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T1 - Strain-relaxed tetragonal MAPbI3 results in efficient mesoporous solar cells

AU - Ye, Tao

AU - Wang, Kai

AU - Ma, Shaoyang

AU - Wu, Congcong

AU - Hou, Yuchen

AU - Yang, Dong

AU - Wang, Ke

AU - Priya, Shashank

N1 - Funding Information: S.M. acknowledges the support from “the Fundamental Research Funds for the Central Universities ” ( 2020RC017 ). T.Y. acknowledges the support from Department of Energy through the STTR program. D.Y. acknowledges the support from Army RIF program . K.W. and Y.H. acknowledge the support from Air Force Office of Scientific Research (award number FA9550-17-1-0341 ). S.P. acknowledges the support through the Office of Naval Research through award number N00014161304 . Publisher Copyright: © 2021 Elsevier Ltd

PY - 2021/5

Y1 - 2021/5

N2 - In mesoporous organo-halide perovskite solar cells, the coexistence of tetragonal phase and cubic phase in the perovskite layer is found to result in strained crystal structure at the mesoporous TiO2 (mp-TiO2)/perovskite heterointerface. This results in structural defects pinholes, grain boundaries, and interfacial porosity which is detrimental towards photovoltaic performance and device stability. The strain at the interface originates from the lattice mismatch between the mp-TiO2 nanoparticles (NPs) and perovskite. Here, a transformative approach is demonstrated to realize relaxed and high purity tetragonal phase MAPbI3 (RP) near the mp-TiO2 interface region. This approach involves inserting a ~2 nm lattice matched buffer layer of cubic CsPbBr3 between mp-TiO2 NPs and MAPbI3, which serves as a template for epitaxial growth for top MAPbI3. The solar cell with relaxed MAPbI3 shows a power conversion efficiency (PCE) of 22.12% with significantly enhanced environmental, light, and thermal stability.

AB - In mesoporous organo-halide perovskite solar cells, the coexistence of tetragonal phase and cubic phase in the perovskite layer is found to result in strained crystal structure at the mesoporous TiO2 (mp-TiO2)/perovskite heterointerface. This results in structural defects pinholes, grain boundaries, and interfacial porosity which is detrimental towards photovoltaic performance and device stability. The strain at the interface originates from the lattice mismatch between the mp-TiO2 nanoparticles (NPs) and perovskite. Here, a transformative approach is demonstrated to realize relaxed and high purity tetragonal phase MAPbI3 (RP) near the mp-TiO2 interface region. This approach involves inserting a ~2 nm lattice matched buffer layer of cubic CsPbBr3 between mp-TiO2 NPs and MAPbI3, which serves as a template for epitaxial growth for top MAPbI3. The solar cell with relaxed MAPbI3 shows a power conversion efficiency (PCE) of 22.12% with significantly enhanced environmental, light, and thermal stability.

KW - Lattice match

KW - Mesoporous perovskite solar cell

KW - Phase coexistence

KW - Pure tetragonal phase

KW - Strain

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