Elucidation of the Formation Mechanism of Highly Oriented Multiphase Ruddlesden-Popper Perovskite Solar Cells

Gyumin Jang, Sunihl Ma, Hyeok Chan Kwon, Sukyoung Goh, Hayeon Ban, Joon Soo Kim, Ji Hee Kim, Jooho Moon

Research output: Contribution to journalArticlepeer-review

Abstract

The crystallographic orientation and phase distribution of two-dimensional Ruddlesden-Popper perovskites (2D-RPPs) should be carefully controlled to obtain high-performance 2D-RPP-based optoelectronic devices. However, these characteristics are still unclear. Herein, we systematically examine the formation mechanism of highly oriented multiphase 2D-RPPs. We argue that the 3D-like perovskites containing small organic cations nucleate first with out-of-plane (111) preferential orientation, followed by the further growth of two-dimensional perovskites incorporating bulky organic cations owing to the difference in the solubility between small and bulky cations. This spatial segregation of organic cations across the film depth induces the formation of multiple perovskite phases, which produces n-value-graded 2D-RPP films with continually upshifted band energy alignment. Highly oriented multiphase 2D-RPP films with isobutylammonium (isoBA2(Cs0.02MA0.64FA0.34)4Pb5I16) were successfully employed as a photoabsorbers for perovskite solar cells (PSCs), exhibiting remarkable efficiency of over 16% and significantly enhanced environmental stability compared with their three-dimensional counterparts.

Original languageEnglish
Pages (from-to)249-260
Number of pages12
JournalACS Energy Letters
Volume6
Issue number1
DOIs
Publication statusPublished - 2021 Jan 8

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation (NRF) of Korea grant (No. 2012R1A3A2026417) funded by the Ministry of Science and ICT. This work was also supported by the Technology Innovation Program - Alchemist Project (No. 20012315) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea).

Publisher Copyright:
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All Science Journal Classification (ASJC) codes

  • Chemistry (miscellaneous)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Materials Chemistry

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