4.8 Article

Stable pure-iodide wide-band-gap perovskites for efficient Si tandem cells via kinetically controlled phase evolution

Journal

JOULE
Volume 6, Issue 10, Pages 2390-2405

Publisher

CELL PRESS
DOI: 10.1016/j.joule.2022.08.006

Keywords

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Funding

  1. National Research Foundation of Korea (NRF) - Korea government (Ministry of Science and ICT) [NRF-2022M3J1A1063226, NRF-2021M3H4A1A03057403, NRF-2020R1A2C1102718]
  2. LG Display under the LGD-SNU Incubation Program
  3. Korea Institute of Energy Technology Evaluation and Planning (KETEP)
  4. Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea [20203040010320]
  5. Research Center Program of Institute for Basic Science of Korea [IBS -R006 -D1]
  6. Samsung Research Funding & Incubation Center of Samsung Electronics [SRFC- MA2002-03]
  7. Ministry of Science & ICT (MSIT), Republic of Korea [IBS-R006-D1-2022-A00] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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This study reports a pure-iodide wide-band-gap perovskite top cell that is almost free from halide segregation. Cs and dimethylammonium cations were simultaneously incorporated into the A-site of the perovskite to increase the band gap while maintaining the tolerance factor. However, the incorporation of dual cations resulted in the formation of orthorhombic and hexagonal phases instead of the pure perovskite phase.
Halide perovskites, promising top-cell materials for efficient Si tan-dem solar cells, suffer from halide segregation, which results from the halide mixing necessary for achieving band-gap widening. We report pure-iodide wide-band-gap perovskite top cells that are fundamentally free of halide segregation. Cs and dimethylammo-nium cations were incorporated simultaneously into the A-site of perovskite structure to increase the band gap while maintaining the tolerance factor. However, the incorporation of dual cations re-sulted in the simultaneous formation of orthorhombic and hexago-nal secondary phases rather than forming the pure perovskite phase, owing to the different precipitation kinetics between cat-ions. We demonstrated that this strategy can only be implemented by the phase-controlled nucleation of the Cs-rich composition that governs the desired phase evolution. The pure-iodide perovskite top cell exhibited excellent photo-stability (1% degradation after 1,000 h of continuous operation; ISOS-L-1I, white LED), and its Si tandem exhibited a high conversion efficiency of 29.4% (28.37% certified).

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