Realizing Reduced Imperfections via Quantum Dots Interdiffusion in High Efficiency Perovskite Solar Cells

Realization of reduced ionic (cationic and anionic) defects at the surface and grain boundaries (GBs) of perovskite films is vital to boost the power conversion efficiency of organic–inorganic halide perovskite (OIHP) solar cells. Although numerous strategies have been developed, effective passivati...

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Published in:Advanced materials (Weinheim) 2020-10, Vol.32 (40), p.e2003296-n/a
Main Authors: Xie, Lin, Vashishtha, Parth, Koh, Teck Ming, Harikesh, Padinhare Cholakkal, Jamaludin, Nur Fadilah, Bruno, Annalisa, Hooper, Thomas J. N., Li, Jia, Ng, Yan Fong, Mhaisalkar, Subodh G, Mathews, Nripan
Format: Article
Language:English
Subjects:
Cations
Crystal defects
Defects
Efficiency
Energy conversion efficiency
Grain boundaries
Interdiffusion
interface passivation
ionic defects
low‐dimensional perovskites
Materials science
Passivity
perovskite solar cells
Perovskites
Photovoltaic cells
quantum dot interdiffusion
Quantum dots
Solar cells
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Summary:Realization of reduced ionic (cationic and anionic) defects at the surface and grain boundaries (GBs) of perovskite films is vital to boost the power conversion efficiency of organic–inorganic halide perovskite (OIHP) solar cells. Although numerous strategies have been developed, effective passivation still remains a great challenge due to the complexity and diversity of these defects. Herein, a solid‐state interdiffusion process using multi‐cation hybrid halide perovskite quantum dots (QDs) is introduced as a strategy to heal the ionic defects at the surface and GBs. It is found that the solid‐state interdiffusion process leads to a reduction in OIHP shallow defects. In addition, Cs+ distribution in QDs greatly influences the effectiveness of ionic defect passivation with significant enhancement to all photovoltaic performance characteristics observed on treating the solar cells with Cs0.05(MA0.17FA0.83)0.95PbBr3 (abbreviated as QDs‐Cs5). This enables power conversion efficiency (PCE) exceeding 21% to be achieved with more than 90% of its initial PCE retained on exposure to continuous illumination of more than 550 h. Introduction of multi‐cation hybrid halide perovskite quantum dots reduces ionic defects at the surface and grain boundaries via a solid‐state interdiffusion process. The enhanced moisture and photostability enable power conversion efficiency (PCE) exceeding 21% to be achieved with more than 90% of its initial PCE retained on exposure to continuous illumination of more than 550 h.
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.202003296