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

Su Geun Ji, Ik Jae Park, Hogeun Chang, Jae Hyun Park, Geon Pyo Hong, Back Kyu Choi, Jun Ho Jang, Yeo Jin Choi, Hyun Woo Lim, You Jin Ahn, So Jeong Park, Ki Tae Nam, Taeghwan Hyeon, Jungwon Park, Dong Hoe Kim, Jin Young Kim

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

Halide perovskites, promising top-cell materials for efficient Si tandem 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 dimethylammonium 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 resulted in the simultaneous formation of orthorhombic and hexagonal secondary phases rather than forming the pure perovskite phase, owing to the different precipitation kinetics between cations. 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).

Original languageEnglish
Pages (from-to)2390-2405
Number of pages16
JournalJoule
Volume6
Issue number10
DOIs
Publication statusPublished - 2022 Oct 19

Bibliographical note

Funding Information:
The authors acknowledge the Energy Business Division, BS Company of LG Electronics for supplying Si bottom cells for the tandem cell fabrication. This work was supported by the National Research Foundation of Korea (NRF) grant funded by Korea government (Ministry of Science and ICT) (no. NRF-2022M3J1A1063226, no. NRF-2021M3H4A1A03057403, and no. NRF-2020R1A2C1102718); LG Display under the LGD-SNU Incubation Program; the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (no. 20203040010320); The Research Center Program of Institute for Basic Science of Korea (no. IBS-R006-D1); and Samsung Research Funding & Incubation Center of Samsung Electronics (no. SRFC-MA2002-03). J.Y.K. supervised the project. S.G.J. and J.Y.K. conceived the idea. S.G.J. I.J.P. D.H.K. and J.Y.K. designed the experiments. S.G.J. characterized and synthesized the perovskite materials and fabricated solar cell devices. I.J.P. helped in the fabrication of perovskite/Si double-junction solar cells. H.C. B.K.C. T.H. and J.P. carried out the observation and analysis of crystallization in perovskite solution by in-situ TEM. J.H.P. helped in the electrical characterization and certification of solar cell devices. G.P.H. helped in performing optical measurement. Y.J.C. helped in the fabrication of perovskite single-junction solar cells. J.H.P. and H.W.L. helped in the long-term stability tests of devices. J.H.J. conducted the NMR analysis. Y.J.C. and S.J.P. helped in performing XRD measurement. Y.J.A. helped in performing SEM observation. S.G.J. I.J.P. H.C. D.H.K. and J.Y.K. wrote the manuscript. All authors contributed to the discussion of the results, provided feedback, and reviewed the manuscript. S.G.J. I.J.P. Y.J.A. and J.Y.K. are inventors on a patent (KR 10-2020-0101527) submitted by R&DB Foundation of Seoul National University that covers the pure-iodide wide-band-gap perovskites.

Funding Information:
The authors acknowledge the Energy Business Division, BS Company of LG Electronics for supplying Si bottom cells for the tandem cell fabrication. This work was supported by the National Research Foundation of Korea (NRF) grant funded by Korea government (Ministry of Science and ICT) (no. NRF-2022M3J1A1063226 , no. NRF-2021M3H4A1A03057403 , and no. NRF-2020R1A2C1102718 ); LG Display under the LGD-SNU Incubation Program ; the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (no. 20203040010320 ); The Research Center Program of Institute for Basic Science of Korea (no. IBS-R006-D1 ); and Samsung Research Funding & Incubation Center of Samsung Electronics (no. SRFC-MA2002-03 ).

Publisher Copyright:
© 2022 Elsevier Inc.

Keywords

  • crystallization kinetics/thermodynamics
  • perovskite/Si tandem
  • photo-stable
  • pure-iodide wide-band-gap perovskite
  • tolerance factor control

ASJC Scopus subject areas

  • Energy(all)

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