The presence of CH3NH2 neutral species in organometal halide perovskite films

Min Cherl Jung, Young Mi Lee, Han Koo Lee, Jinwoo Park, Sonia R. Raga, Luis K. Ono, Shenghao Wang, Matthew R. Leyden, Byung Deok Yu, Suklyun Hong, Yabing Qi

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Abstract

We report the presence of CH3NH2 neutral species not only on the surface but also at grain boundaries in the interior of thin polycrystalline films of methylammonium lead iodide perovskite CH3NH3PbI3 (thickness ∼ 50 nm) that were prepared using a standard solution method. Different chemical states for C K-edge were observed at the surfaces and in the interiors of perovskite films. Salient features of σ∗(CH3-NH3+: methylammonium cation) and σ∗(CH3-NH2: methylamine neutral species) were observed at 290.3 and 292.8 eV in both partial (surface-sensitive) and total (bulk) electron yield modes by near-edge x-ray absorption fine structure measurements. Consistently, two chemical states originated from CH3NH3+ and CH3NH2 in C 1s and N 1s core-level spectra were observed using high-resolution x-ray photoelectron spectroscopy. Using density functional theory calculations, we show that CH3NH2 cannot reside stably in the MAPbI3 perovskite crystal structure. Therefore, we propose that these CH3NH2 neutral species are mainly located on the surface or at grain boundaries in the interior of CH3NH3PbI3 films.

Original languageEnglish
Article number073901
Number of pages5
JournalApplied Physics Letters
Volume108
Issue number7
DOIs
Publication statusPublished - 17 Feb 2016
Externally publishedYes

Cite this

Jung, M. C., Lee, Y. M., Lee, H. K., Park, J., Raga, S. R., Ono, L. K., ... Qi, Y. (2016). The presence of CH3NH2 neutral species in organometal halide perovskite films. Applied Physics Letters, 108(7), [073901]. https://doi.org/10.1063/1.4941994
Jung, Min Cherl ; Lee, Young Mi ; Lee, Han Koo ; Park, Jinwoo ; Raga, Sonia R. ; Ono, Luis K. ; Wang, Shenghao ; Leyden, Matthew R. ; Yu, Byung Deok ; Hong, Suklyun ; Qi, Yabing. / The presence of CH3NH2 neutral species in organometal halide perovskite films. In: Applied Physics Letters. 2016 ; Vol. 108, No. 7.
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abstract = "We report the presence of CH3NH2 neutral species not only on the surface but also at grain boundaries in the interior of thin polycrystalline films of methylammonium lead iodide perovskite CH3NH3PbI3 (thickness ∼ 50 nm) that were prepared using a standard solution method. Different chemical states for C K-edge were observed at the surfaces and in the interiors of perovskite films. Salient features of σ∗(CH3-NH3+: methylammonium cation) and σ∗(CH3-NH2: methylamine neutral species) were observed at 290.3 and 292.8 eV in both partial (surface-sensitive) and total (bulk) electron yield modes by near-edge x-ray absorption fine structure measurements. Consistently, two chemical states originated from CH3NH3+ and CH3NH2 in C 1s and N 1s core-level spectra were observed using high-resolution x-ray photoelectron spectroscopy. Using density functional theory calculations, we show that CH3NH2 cannot reside stably in the MAPbI3 perovskite crystal structure. Therefore, we propose that these CH3NH2 neutral species are mainly located on the surface or at grain boundaries in the interior of CH3NH3PbI3 films.",
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Jung, MC, Lee, YM, Lee, HK, Park, J, Raga, SR, Ono, LK, Wang, S, Leyden, MR, Yu, BD, Hong, S & Qi, Y 2016, 'The presence of CH3NH2 neutral species in organometal halide perovskite films', Applied Physics Letters, vol. 108, no. 7, 073901. https://doi.org/10.1063/1.4941994

The presence of CH3NH2 neutral species in organometal halide perovskite films. / Jung, Min Cherl; Lee, Young Mi; Lee, Han Koo; Park, Jinwoo; Raga, Sonia R.; Ono, Luis K.; Wang, Shenghao; Leyden, Matthew R.; Yu, Byung Deok; Hong, Suklyun; Qi, Yabing.

In: Applied Physics Letters, Vol. 108, No. 7, 073901, 17.02.2016.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - The presence of CH3NH2 neutral species in organometal halide perovskite films

AU - Jung, Min Cherl

AU - Lee, Young Mi

AU - Lee, Han Koo

AU - Park, Jinwoo

AU - Raga, Sonia R.

AU - Ono, Luis K.

AU - Wang, Shenghao

AU - Leyden, Matthew R.

AU - Yu, Byung Deok

AU - Hong, Suklyun

AU - Qi, Yabing

PY - 2016/2/17

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N2 - We report the presence of CH3NH2 neutral species not only on the surface but also at grain boundaries in the interior of thin polycrystalline films of methylammonium lead iodide perovskite CH3NH3PbI3 (thickness ∼ 50 nm) that were prepared using a standard solution method. Different chemical states for C K-edge were observed at the surfaces and in the interiors of perovskite films. Salient features of σ∗(CH3-NH3+: methylammonium cation) and σ∗(CH3-NH2: methylamine neutral species) were observed at 290.3 and 292.8 eV in both partial (surface-sensitive) and total (bulk) electron yield modes by near-edge x-ray absorption fine structure measurements. Consistently, two chemical states originated from CH3NH3+ and CH3NH2 in C 1s and N 1s core-level spectra were observed using high-resolution x-ray photoelectron spectroscopy. Using density functional theory calculations, we show that CH3NH2 cannot reside stably in the MAPbI3 perovskite crystal structure. Therefore, we propose that these CH3NH2 neutral species are mainly located on the surface or at grain boundaries in the interior of CH3NH3PbI3 films.

AB - We report the presence of CH3NH2 neutral species not only on the surface but also at grain boundaries in the interior of thin polycrystalline films of methylammonium lead iodide perovskite CH3NH3PbI3 (thickness ∼ 50 nm) that were prepared using a standard solution method. Different chemical states for C K-edge were observed at the surfaces and in the interiors of perovskite films. Salient features of σ∗(CH3-NH3+: methylammonium cation) and σ∗(CH3-NH2: methylamine neutral species) were observed at 290.3 and 292.8 eV in both partial (surface-sensitive) and total (bulk) electron yield modes by near-edge x-ray absorption fine structure measurements. Consistently, two chemical states originated from CH3NH3+ and CH3NH2 in C 1s and N 1s core-level spectra were observed using high-resolution x-ray photoelectron spectroscopy. Using density functional theory calculations, we show that CH3NH2 cannot reside stably in the MAPbI3 perovskite crystal structure. Therefore, we propose that these CH3NH2 neutral species are mainly located on the surface or at grain boundaries in the interior of CH3NH3PbI3 films.

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DO - 10.1063/1.4941994

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JO - Applied Physics Letters

JF - Applied Physics Letters

SN - 0003-6951

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