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CMP
Credit: Jack Hobhouse

Shuaifeng Hu

Postdoctoral Research Assistant

Research theme

  • Photovoltaics and nanoscience

Sub department

  • Condensed Matter Physics

Research groups

  • Snaith group
shuaifeng.hu@physics.ox.ac.uk
Robert Hooke Building, room G24
Google Scholar
  • About
  • Publications

Crystallographic Characterization of Lu2O@Cs(6)‐C82 and Er2O@Cs(6)‐C82: The Role of Metal Species on Cluster Configuration†

Chinese Journal of Chemistry Wiley 41:16 (2023) 1915-1920

Authors:

Pengwei Yu, Haocheng Mei, Shuaifeng Hu, Changwang Pan, Wangqiang Shen, Pengyuan Yu, Kun Guo, Yunpeng Xie, Takeshi Akasaka, Lipiao Bao, Xing Lu
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Tin halide perovskite solar cells with open-circuit voltages approaching the Shockley–Queisser limit

ACS Applied Materials & Interfaces American Chemical Society 15:27 (2023) 32487-32495

Authors:

Wentao Liu, Shuaifeng Hu, Jorge Pascual, Kyohei Nakano, Richard Murdey, Keisuke Tajima, Atsushi Wakamiya

Abstract:

The power conversion efficiency of tin-based halide perovskite solar cells is limited by large photovoltage losses arising from the significant energy-level offset between the perovskite and the conventional electron transport material, fullerene C60. The fullerene derivative indene-C60 bisadduct (ICBA) is a promising alternative to mitigate this drawback, owing to its superior energy level matching with most tin-based perovskites. However, the less finely controlled energy disorder of the ICBA films leads to the extension of its band tails that limits the photovoltage of the resultant devices and reduces the power conversion efficiency. Herein, we fabricate ICBA films with improved morphology and electrical properties by optimizing the choice of solvent and the annealing temperature. Energy disorder in the ICBA films is substantially reduced, as evidenced by the 22 meV smaller width of the electronic density of states. The resulting solar cells show open-circuit voltages of up to 1.01 V, one of the highest values reported so far for tin-based devices. Combined with surface passivation, this strategy enabled solar cells with efficiencies of up to 11.57%. Our work highlights the importance of controlling the properties of the electron transport material toward the development of efficient lead-free perovskite solar cells and demonstrates the potential of solvent engineering for efficient device processing.

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BAr2‐Bridged Azafulvene Dimers with Tunable Energy Levels for Photostable Near‐Infrared Dyes

Chemistry - A European Journal Wiley 29:34 (2023) e202300529

Authors:

Tiancheng Tan, Tomoya Nakamura, Richard Murdey, Shuaifeng Hu, Minh Anh Truong, Atsushi Wakamiya
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Prospects for tin-containing halide perovskite photovoltaics

Precision Chemistry American Chemical Society 1:2 (2023) 69-82

Authors:

Shuaifeng Hu, Joel A Smith, Henry J Snaith, Atsushi Wakamiya

Abstract:

Tin-containing metal halide perovskites have enormous potential as photovoltaics, both in narrow band gap mixed tin–lead materials for all-perovskite tandems and for lead-free perovskites. The introduction of Sn(II), however, has significant effects on the solution chemistry, crystallization, defect states, and other material properties in halide perovskites. In this perspective, we summarize the main hurdles for tin-containing perovskites and highlight successful attempts made by the community to overcome them. We discuss important research directions for the development of these materials and propose some approaches to achieve a unified understanding of Sn incorporation. We particularly focus on the discussion of charge carrier dynamics and nonradiative losses at the interfaces between perovskite and charge extraction layers in p-i-n cells. We hope these insights will aid the community to accelerate the development of high-performance, stable single-junction tin-containing perovskite solar cells and all-perovskite tandems.
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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 π-conjugated structures, hole extraction is expected to be more efficient when the π-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%.
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