Mitigating Iodine Diffusion by a MoO₃–Organic Composite Hole Transport Layer for Stable Perovskite Solar Cells Article Swipe

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Triphenylamine Halide Perovskite (structure) Iodine Layer (electronics) Molybdenum trioxide Chemistry Thermal stability Chemical engineering Diffusion Materials science Inorganic chemistry Molybdenum Photochemistry Organic chemistry Physics Thermodynamics Engineering

Jisu Hong , Zhaojian Xu , Dominique Lungwitz , J.L. Scott , H. M. Johnson , Yun‐Hi Kim , Antoine Kahn , Barry P. Rand ·

YOU? · · 2023 · Open Access · · DOI: https://doi.org/10.1021/acsenergylett.3c01873 · OA: W4388290005

Halide perovskite solar cells (PSCs) exhibit commercialization potential, but long-term stability still must be addressed. Among various products of perovskite decomposition, iodine species are of considerable concern due to their high vapor pressure and corrosive nature. To address this, a small-molecule hole transport layer (HTL), 4,4',4"-tris[(3-methylphenyl)phenylamino]triphenylamine (m-MTDATA), is used; mixing it with molybdenum trioxide (MoO3) p-dopes the layer and slows iodine permeation. Furthermore, we demonstrate that m-MTDATA:MoO3 HTLs employed in PSCs improve stability under both thermal and voltage bias stress compared to devices with a conventional doped 2,2',7,7'-tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9'-spirobifluorene (spiro-OMeTAD) HTL.