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Characterising halide perovskite crystallisation pathways using in situ GIWAXS

Fundacio Scito (2023)

Authors:

Joel Smith, Pietro Caprioglio, Benjamin Gallant, Margherita Taddei, Saqlain Choudhary, David Ginger, Henry Snaith

Understanding operation and improving the performance of metal halide perovskite solar cells

Fundacio Scito (2023)

Bifunctional Electron-Transporting Agent for Red Colloidal Quantum Dot Light-Emitting Diodes

Journal of the American Chemical Society American Chemical Society (ACS) 145:11 (2023) 6428-6433

Authors:

Ya-Kun Wang, Haoyue Wan, Jian Xu, Yun Zhong, Eui Dae Jung, So Min Park, Sam Teale, Muhammad Imran, You-Jun Yu, Pan Xia, Yu-Ho Won, Kwang-Hee Kim, Zheng-Hong Lu, Liang-Sheng Liao, Sjoerd Hoogland, Edward H Sargent

Tripodal triazatruxene derivative as a face-on oriented hole-collecting monolayer for efficient and stable inverted perovskite solar cells

Journal of the American Chemical Society American Chemical Society 145:13 (2023) 7528-7539

Authors:

Minh Anh Truong, Tsukasa Funasaki, Lucas Ueberricke, Wataru Nojo, Richard Murdey, Takumi Yamada, Shuaifeng Hu, Aruto Akatsuka, Naomu Sekiguchi, Shota Hira, Lingling Xie, Tomoya Nakamura, Nobutaka Shioya, Daisuke Kan, Yuta Tsuji, Satoshi Iikubo, Hiroyuki Yoshida, Yuichi Shimakawa, Takeshi Hasegawa, Yoshihiko Kanemitsu, Takanori Suzuki, Atsushi Wakamiya

Abstract:

Hole-collecting monolayers have drawn attention in perovskite solar cell research due to their ease of processing, high performance, and good durability. Since molecules in the hole-collecting monolayer are typically composed of functionalized 蟺-conjugated structures, hole extraction is expected to be more efficient when the 蟺-cores are oriented face-on with respect to the adjacent surfaces. However, strategies for reliably controlling the molecular orientation in monolayers remain elusive. In this work, multiple phosphonic acid anchoring groups were used to control the molecular orientation of a series of triazatruxene derivatives chemisorbed on a transparent conducting oxide electrode surface. Using infrared reflection absorption spectroscopy and metastable atom electron spectroscopy, we found that multipodal derivatives align face-on to the electrode surface, while the monopodal counterpart adopts a more tilted configuration. The face-on orientation was found to facilitate hole extraction, leading to inverted perovskite solar cells with enhanced stability and high-power conversion efficiencies up to 23.0%.

Probing the local electronic structure in metal halide perovskites through cobalt substitution

Small Methods Wiley 7:6 (2023) 2300095

Authors:

Amir Haghighirad, M Klug, Liam Duffy, Junyie Liu, Arzhang Ardavan, Gerrit van der Laan, Thorsten Hesjedal, Henry Snaith

Abstract:

Owing to the unique chemical and electronic properties arising from 3d鈥恊lectrons, substitution with transition metal ions is one of the key routes for engineering new functionalities into materials. While this approach has been used extensively in complex metal oxide perovskites, metal halide perovskites have largely resisted facile isovalent substitution. In this work, it is demonstrated that the substitution of Co2+ into the lattice of methylammonium lead triiodide imparts magnetic behavior to the material while maintaining photovoltaic performance at low concentrations. In addition to comprehensively characterizing its magnetic properties, the Co2+ ions themselves are utilized as probes to sense the local electronic environment of Pb in the perovskite, thereby revealing the nature of their incorporation into the material. A comprehensive understanding of the effect of transition metal incorporation is provided, thereby opening the substitution gateway for developing novel functional perovskite materials and devices for future technologies.