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DOE OSTI · 2345689

Mitigating Iodine Diffusion by a MoO 3 –Organic Composite Hole Transport Layer for Stable Perovskite Solar Cells

Hong, Jisu·Xu, Zhaojian·Lungwitz, Dominique·Scott, Jonathan·Johnson, Holly M.·Kim, Yun-Hi·Kahn, Antoine·Rand, Barry P.
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Abstract

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.

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Hong, Jisu, Xu, Zhaojian, Lungwitz, Dominique, Scott, Jonathan, Johnson, Holly M., Kim, Yun-Hi, Kahn, Antoine, Rand, Barry P.. 2023-11-03. Mitigating Iodine Diffusion by a MoO 3 –Organic Composite Hole Transport Layer for Stable Perovskite Solar Cells. https://doi.org/10.1021/acsenergylett.3c01873

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