Challenges in the ambient Raman spectroscopy characterization of methylammonium lead triiodide perovskite thin films

doi:10.1007/s12200-016-0573-8

Front. Optoelectron.

2016, Vol. 9

Issue (1) : 81-86 https://doi.org/10.1007/s12200-016-0573-8

RESEARCH ARTICLE

Challenges in the ambient Raman spectroscopy characterization of methylammonium lead triiodide perovskite thin films

Yuanyuan ZHOU(

),Hector F. GARCES,Nitin P. PADTURE(

)

School of Engineering, Brown University, Providence RI 02912, USA

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Abstract

The importance of methylammonium lead triiodide (CH₃NH₃PbI₃ or MAPbI₃) organic-inorganic hybrid perovskites has shot up dramatically since their use in highly efficient thin-film perovskite solar cells (PSCs). However, the basic structural characterization of these fascinating materials remains sparse. In particular, Raman spectroscopy, which is a powerful vibrational spectroscopy characterization tool and complements other characterization methods, of MAPbI₃ under ambient conditions is plagued with difficulties. Here, a systematic ambient Raman spectroscopy characterization study of MAPbI₃ thin films is conducted under different conditions (excitation laser wavelength, integration time, filter characteristic). The results from this study help elucidate the possible sources of artifacts in the Raman spectra, and raise the awareness of the challenges in the ambient Raman spectroscopy of MAPbI₃ perovskites. Approaches to overcome these challenges are suggested.

Keywords perovskite solar cells Raman spectroscopy laser-degradation

Corresponding Author(s): Yuanyuan ZHOU,Nitin P. PADTURE

Just Accepted Date: 31 December 2015 Online First Date: 20 January 2016 Issue Date: 18 March 2016

Cite this article:

Yuanyuan ZHOU,Hector F. GARCES,Nitin P. PADTURE. Challenges in the ambient Raman spectroscopy characterization of methylammonium lead triiodide perovskite thin films[J]. Front. Optoelectron., 2016, 9(1): 81-86.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-016-0573-8
https://academic.hep.com.cn/foe/EN/Y2016/V9/I1/81

Fig.1 Crystal structure of MAPbI₃ perovskite: (a) ?100? view and (b) ?001? view

Fig.2 Characterization of MAPbI₃ perovskite thin films deposited on Al substrate: (a) indexed XRD pattern, (b) top-view SEM image, and (c) cross-sectional SEM image

Fig.3 Raman spectra (left) of MAPbI₃ thin films on Al-coated quartz substrates at short (0.2 s, 10 accumulations) and long (2.0 s, 10 accumulations) integration times (with regular notch filter), and corresponding before and after optical micrographs (right) of the sample: (a) 532 nm laser excitation, (b) 633 nm laser excitation

Fig.4 Raman spectra (left) of MAPbI₃ thin film on Al-coated quartz substrate at short integration time (0.2 s, 10 accumulations), with low-wavelength holographic notch filter (532 nm laser excitation)

Fig.5 Fig. 5 Raman spectra of (a) PbI₂ and (b) MAI thin films on Al substrates: short integration time (0.2 s, 10 accumulations); 532 nm laser excitation; with low-wavelength holographic notch filter. Dashed lines mark the centers of the PbI₂ bands

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