Siyu Yan

Overcoming Charge-Carrier Localization in Metal Chalcohalides

Bembe C. Mackintosh, Marcello Righetto, Gopal Krishnamurthy Grandhi, Thomas B. Haward et autres

High Resolution Image Download MS PowerPoint Slide Effective charge-carrier transport is a key requirement of next-generation thin-film materials developed for solar cells. Perovskite-inspired materials (PIMs), including metal chalcohalides, show great promise as lead-free solar absorbers. However, intrinsic charge-carrier localization processes have frequently …

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Is Photoluminescence Spectroscopy a Suitable Probe of Halide Segregation?

Joshua R. S. Lilly, Vincent J.-Y. Lim, Jay B. Patel, Jae Eun Lee et autres

High Resolution Image Download MS PowerPoint Slide Mixed-halide perovskites exhibit ideal band gaps for use in perovskite-based multijunction photovoltaics, but stable performance is compromised by light-induced halide segregation. Photoluminescence (PL) tracking is universally used to monitor such photoinstability; however, here we reveal …

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Impact of residual triphenylphosphine oxide on the crystallization of vapor-deposited metal halide perovskite films

Sarah J. Scripps, Siyu Yan, Qimu Yuan, Laura M. Herz et autres

Thermal evaporation is an industrially compatible technique for fabricating metal halide perovskite thin films, without the requirement for hazardous solvents. It offers precise control over film thickness and is a good candidate for large-scale production of commercial optoelectronic metal halide perovskite devices, …

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Unravelling the Impact of Halide Alloying on the Phase Segregation of Mixed-Halide Perovskites via Multimodal In-Situ Spectroscopy

Joshua R. S. Lilly, Vincent J.-Y. Lim, Jay B. Patel, Siyu Yan et autres

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Impact of Halide Alloying on the Phase Segregation of Mixed‐Halide Perovskites

Joshua R. S. Lilly, Vincent J.‐Y. Lim, Jay B. Patel, Siyu Yan et autres

Mixed‐halide perovskites are ideal mid‐ and wide‐gap absorbers for multijunction solar cells, but stable photovoltaic performance is severely hampered by halide segregation. This study reveals that crystalline film quality and halide segregation are critically affected by bromide fraction x in CH 3 …

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Impact of Charge Transport Layers on the Structural and Optoelectronic Properties of Coevaporated Cu2AgBiI6

Jae Eun Lee, Marcello Righetto, Benjamin W. J. Putland, Siyu Yan et autres

High Resolution Image Download MS PowerPoint Slide The copper–silver–bismuth–iodide compound Cu 2 AgBiI 6 has emerged as a promising lead-free and environmentally friendly alternative to wide-bandgap lead-halide perovskites for applications in multijunction solar cells. Despite its promising optoelectronic properties, the efficiency of …

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Terahertz Raman and infrared modes in metal halides for solar cells

Vincent J.‐Y. Lim, Marcello Righetto, Siyu Yan, Jay B. Patel et autres

Vibrational properties and lattice dynamics are fundamental to photovoltaic device performances in semiconductors. Metal-halide perovskites show intriguing dynamics in Raman spectra, where an extremely broad response is visible towards low frequencies, and the origin of this phenomenon is still under debate within …

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Quantum Wells in Magnesium–Manganese Bimetallic Antiperovskites for High Luminescence

Yangyang Cai, Siyu Yan, Yue‐Jian Lin, Tingting Lin et autres

Perovskite has attracted extensive attention in the realm of photovoltaic and light-emitting diodes (LEDs) on account of its outstanding photoelectric properties. Perovskite-type quantum wells (QW) have been developed for high-efficiency perovskite-type LEDs. However, there are few reports on the in situ quantum …

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From solution to thin-film: Approaches to improving the optoelectronic properties of halide perovskites

Siyu Yan, Henry James Snaith, Nakita K. Noel

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Inter-Layer Diffusion of Excitations in 2D Perovskites Revealed by Photoluminescence Reabsorption

Jiaxing Du, Marcello Righetto, Siyu Yan, Karim A. Elmestekawy et autres

Abstract 2D lead halide perovskites (2DPs) offer chemical compatibility with 3D perovskites and enhanced stability, which are attractive for applications in photovoltaic and light‐emitting devices. However, such lowered structural dimensionality causes increased excitonic effects and highly anisotropic charge‐carrier transport. Determining the diffusivity …

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Reversible Isomerization of Stiff-Stilbene by an Oriented External Electric Field

Rui Wang, Yingjie Li, Siyu Yan, Zekai Zhang et autres

Understanding and effectively controlling molecular conformational changes are essential for developing responsive and dynamic molecular systems. Here, we report that an oriented external electric field (OEEF) is an effective catalyst for the cis-trans isomerization of stiff-stilbene, a key component of overcrowded alkene-based …

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Color-tunable ultralong room temperature afterglow in a wide excitation range from ultraviolet to visible light via doping boric acid with polyaromatic hydrocarbons

Siyu Yan, Yunze Huang, Weibo Zhang, Jing Yang

embedding polycyclic aromatic hydrocarbons (PAHs containing triphenylene (TP) and coronene (CN)) into a boric acid (BA) matrix (denoted as PAHs-BA, TP-BA and CN-BA). Specifically, the TP-BA system exhibits a minute-level blue UL-RTA with an ultralong lifetime of 6744 ms, while the CN-BA …

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