Enhanced yield-mobility products in hybrid halide Ruddlesden–Popper compounds with aromatic ammonium spacers

Venkatesan, Naveen R.; Mahdi, Ali; Barraza, Brian; Wu, Guang; Chabinyc, Michael L.; Seshadri, Ram

doi:10.1039/C9DT03074C

Title: Enhanced yield-mobility products in hybrid halide Ruddlesden–Popper compounds with aromatic ammonium spacers

Journal Article · Thu Sep 05 00:00:00 EDT 2019 · Dalton Transactions

DOI:https://doi.org/10.1039/C9DT03074C· OSTI ID:1594803

^[1]; Mahdi, Ali ^[2]; Barraza, Brian ^[2]; Wu, Guang ^[2];

^[1];

^[1]

Univ. of California, Santa Barbara, CA (United States). Dept. of Materials
Univ. of California, Santa Barbara, CA (United States). Dept. of Chemistry and Biochemistry

We show hybrid halide Ruddlesden–Popper compounds are related to three-dimensional hybrid AMX₃ perovskites (e.g. where A is a monovalent cation, M is a divalent metal cation, and X is a halogen) with the general formula L₂A_n–1M_nX_3n+1 where L is a monovalent spacer cation. The crystal structure comprises perovskite-like layers separated by organic cation spacers. Here two Ruddlesden–Popper compounds with a conjugated cation, 2-(4-biphenyl)ethylammonium (BPEA) prepared by solvothermal and solvent evaporation techniques are reported. The structures of the two compounds: (BPEA)₂PbI₄ and (BPEA)₂(CH₃NH₃)Pb₂I₇, were solved by X-ray crystallography. The aromatic rings of the BPEA groups are well-separated in the organic layers leading to optical properties comparable to n = 1 and 2 hybrid halide Ruddlesden–Popper compounds with simpler alkyl ammonium cations. The ambient stability of both compounds over time was also confirmed by powder X-ray diffraction. Finally, the transient photoconductance, measured by time-resolved microwave conductivity, show that the compounds have maximum yield-mobility products respectively of 0.07 cm² V^–1 s^–1 and 1.11 cm² V^–1 s^–1 for (BPEA)₂PbI₄ and (BPEA)₂(CH₃NH₃)Pb₂I₇, both slightly enhanced over what has been measured for compounds with simpler (n-butylammonium) spacer cations.

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Research Organization:: Univ. of California, Santa Barbara, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: SC0012541; DMR-1720256

OSTI ID:: 1594803

Alternate ID(s):: OSTI ID: 1560335

Journal Information:: Dalton Transactions, Vol. 48, Issue 37; ISSN 1477-9226

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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Title: Enhanced yield-mobility products in hybrid halide Ruddlesden–Popper compounds with aromatic ammonium spacers

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