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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

Halide homogenization for low energy loss in 2-eV-bandgap perovskites and increased efficiency in all-perovskite triple-junction solar cells

Nature Energy Springer Nature 9:1 (2023) 70-80

Authors:

Junke Wang, Lewei Zeng, Dong Zhang, Aidan Maxwell, Hao Chen, Kunal Datta, Alessandro Caiazzo, Willemijn HM Remmerswaal, Nick RM Schipper, Zehua Chen, Kevin Ho, Akash Dasgupta, Gunnar Kusch, Riccardo Ollearo, Laura Bellini, Shuaifeng Hu, Zaiwei Wang, Chongwen Li, Sam Teale, Luke Grater, Bin Chen, Martijn M Wienk, Rachel A Oliver, Henry J Snaith, René AJ Janssen, Edward H Sargent

Abstract:

Monolithic all-perovskite triple-junction solar cells have the potential to deliver power conversion efficiencies beyond those of state-of-art double-junction tandems and well beyond the detailed-balance limit for single junctions. Today, however, their performance is limited by large deficits in open-circuit voltage and unfulfilled potential in both short-circuit current density and fill factor in the wide-bandgap perovskite sub cell. Here we find that halide heterogeneity—present even immediately following materials synthesis—plays a key role in interfacial non-radiative recombination and collection efficiency losses under prolonged illumination for Br-rich perovskites. We find that a diammonium halide salt, propane-1,3-diammonium iodide, introduced during film fabrication, improves halide homogenization in Br-rich perovskites, leading to enhanced operating stability and a record open-circuit voltage of 1.44 V in an inverted (p–i–n) device; ~86% of the detailed-balance limit for a bandgap of 1.97 eV. The efficient wide-bandgap sub cell enables the fabrication of monolithic all-perovskite triple-junction solar cells with an open-circuit voltage of 3.33 V and a champion PCE of 25.1% (23.87% certified quasi-steady-state efficiency).
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Stabilizing non-IPR C2(13333)-C74 cage with Lu2C2/Lu2O: the importance of encaged non-metallic elements

Chemical Communications Royal Society of Chemistry (RSC) (2023)

Authors:

Pengwei Yu, Mengyang Li, Shuaifeng Hu, Changwang Pan, Wangqiang Shen, Kun GUO, Yun-Peng Xie, Lipiao Bao, Rui Zhang, Xing Lu

Abstract:

The difference in encaged non-metallic element (i.e., C2 versus O) leads to clear change of intramolecular interactions and shifts in redox potentials of Lu2C2@C2(13333)-C74 and Lu2O@C2(13333)-C74, as a result of...
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Quantum-Chemical Modeling of Two Er3N@C80 Isomers

ECS Journal of Solid State Science and Technology The Electrochemical Society 12:9 (2023) 091004

Authors:

Zdeněk Slanina, Filip Uhlík, Shuaifeng Hu, Takeshi Akasaka, Xing Lu, Ludwik Adamowicz
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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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