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Hot-Casting-Assisted Liquid Additive Engineering for Efficient and Stable Perovskite Solar Cells

Title
Hot-Casting-Assisted Liquid Additive Engineering for Efficient and Stable Perovskite Solar Cells
Authors
Min, HanulHu, JunnanXu, ZhaojianLiu, TianranKhan, Saeed-Uz-ZamanRoh, KwangdongLoo, Yueh-LinRand, Barry P.
Ewha Authors
노광동
SCOPUS Author ID
노광동scopus
Issue Date
2022
Journal Title
ADVANCED MATERIALS
ISSN
0935-9648JCR Link

1521-4095JCR Link
Citation
ADVANCED MATERIALS vol. 34, no. 36
Keywords
dimethyl sulfoxidehot castingliquid additivesperovskite solar cellsperovskite-substrate interfaceUV stability
Publisher
WILEY-V C H VERLAG GMBH
Indexed
SCIE; SCOPUS WOS
Document Type
Article
Abstract
High-performance inorganic-organic lead halide perovskite solar cells (PSCs) are often fabricated with a liquid additive such as dimethyl sulfoxide (DMSO), which retards crystallization and reduces roughness and pinholes in the perovskite layers. However, DMSO can be trapped during perovskite film formation and induce voids and undesired reaction byproducts upon later processing steps. Here, it is shown that the amount of residual DMSO can be reduced in as-spin-coated films significantly through use of preheated substrates, or a so-called hot-casting method. Hot casting increases the perovskite film thickness given the same concentration of solutions, which allows for reducing the perovskite solution concentration. By reducing the amount of DMSO in proportion to the concentration of perovskite precursors and using hot casting, it is possible to fabricate perovskite layers with improved perovskite-substrate interfaces by suppressing the formation of byproducts, which increase trap density and accelerate degradation of the perovskite layers. The best-performing PSCs exhibit a power conversion efficiency (PCE) of 23.4% (23.0% stabilized efficiency) under simulated solar illumination. Furthermore, encapsulated devices show considerably reduced post-burn-in decay, retaining 75% and 90% of their initial and post-burn-in efficiencies after 3000 h of operation with maximum power point tracking (MPPT) under high power of ultraviolet (UV)-containing continuous light exposure.
DOI
10.1002/adma.202205309
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자연과학대학 > 물리학전공 > Journal papers
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