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Ethylenediamine Addition Improves Performance and Suppresses Phase Instabilities in Mixed-Halide Perovskites

(2022)

Authors:

Margherita Taddei, Joel A Smith, Benjamin M Gallant, Suer Zhou, Robert JE Westbrook, Yangwei Shi, Jian Wang, James N Drysdale, Declan P McCarthy, Stephen Barlow, Seth R Marder, Henry J Snaith, David S Ginger
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Operational stability, low light performance, and long-lived transients in mixed-halide perovskite solar cells with a monolayer-based hole extraction layer

Solar Energy Materials and Solar Cells Elsevier 245 (2022) 111885

Authors:

Richard Murdey, Yasuhisa Ishikura, Yuko Matsushige, Shuaifeng Hu, Jorge Pascual, Minh Anh Truong, Tomoya Nakamura, Atsushi Wakamiya
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Impact of the Addition of Tin on the Charge Carrier Dynamics of Metal Halide Perovskites

47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz), 2022

Authors:

Stephanie O Adeyemo, Krishanu Dey, Samuel D Stranks, Hannah J Joyce

Abstract:

The gradual partial to full introduction of lead into pure tin films has been shown to enhance the stability and performance of tin-based perovskite thin films. However, how its influences the charge carrier recombination dynamics is yet to be studied. Here, the impact of the addition of tin on the charge carrier recombination dynamics is studied. We elucidate an enhancement in the charge carrier lifetime and hence reduction in monomolecular recombination with the introduction of higher lead ratio.
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Syntheses of novel fluorinated dibenzo[ a , c ]phenazine comprising polymers for electrochromic device applications

New Journal of Chemistry Royal Society of Chemistry (RSC) 46:31 (2022) 14826-14839

Authors:

Serife O Hacioglu, Ece Aktas, Gonul Hizalan, Naime Akbasoglu, Ali Cirpan, Levent Toppare
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Impact of hole-transport layer and interface passivation on halide segregation in mixed-halide perovskites

Advanced Functional Materials Wiley 32:41 (2022) 2204825

Authors:

Vincent JY Lim, Alexander J Knight, Robert DJ Oliver, Henry J Snaith, Michael B Johnston, Laura M Herz

Abstract:

Mixed-halide perovskites offer ideal bandgaps for tandem solar cells, but photoinduced halide segregation compromises photovoltaic device performance. This study explores the influence of a hole-transport layer, necessary for a full device, by monitoring halide segregation through in situ, concurrent X-ray diffraction and photoluminescence measurements to disentangle compositional and optoelectronic changes. This work demonstrates that top coating FA0.83Cs0.17Pb(Br0.4I0.6)3 perovskite films with a poly(triaryl)amine (PTAA) hole-extraction layer surprisingly leads to suppression of halide segregation because photogenerated charge carriers are rapidly trapped at interfacial defects that do not drive halide segregation. However, the generation of iodide-enriched regions near the perovskite/PTAA interface enhances hole back-transfer from the PTAA layer through improved energy level offsets, increasing radiative recombination losses. It is further found that while passivation with a piperidinium salt slows halide segregation in perovskite films, the addition of a PTAA top-coating accelerates such effects, elucidating the specific nature of trap types that are able to drive the halide segregation process. This work highlights the importance of selective passivation techniques for achieving efficient and stable wide-bandgap perovskite photovoltaic devices.
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