Variation of the Methylamine Lead Iodine Precursor Thin Films During Aging and Its Influence on the Subsequent Perovskite Thin Films

doi:10.11944/j.issn.1000-0518.2017.07.160417

Chinese Journal of Applied Chemistry ›› 2017, Vol. 34 ›› Issue (7): 818-823.DOI: 10.11944/j.issn.1000-0518.2017.07.160417

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Variation of the Methylamine Lead Iodine Precursor Thin Films During Aging and Its Influence on the Subsequent Perovskite Thin Films

MENG Yinxia^a^b,LI Zhanguo^a(),FENG Yuxiang^a,ZHANG Jidong^b^*()

^aState Key Laboratory on High Power Semicondutor Lasers,Changchun University of Science and Technology,Changchun 130022,China
^bState Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China

Received:2016-10-17 Accepted:2016-12-29 Published:2017-07-04 Online:2017-07-04
Contact: ZHANG Jidong
Supported by:
Supported by the National Natural Science Foundation of China(No.61430037, No.11474036), Project of Science and Technology Department of Jilin Province(No.20140520139JH), Foundation of Education Department of Jilin Province(No.2015174)

Abstract

Abstract:

Variation of the methylamine lead iodine(MAPbI₃) precursor thin films during aging at room temperature in the air was studied. With the aging time increasing, more MAPbI₃ perovskite is generated and after about 220 min it reaches a stable value while some precursors are still left. The influence of such variation on the subsequent MAPbI₃ perovskite thin films was also studied. The X-ray diffraction intensity and UV-Vis absorption of methylamine lead iodine precursor films after aging were lower than those of the as prepared films. The comparison of atomic force microscopy(AFM) surface morphology after thermal annealing shows that the crystalline grain size of thin film made from aged precursor thin film is much smaller than that made from the as prepared precursor film, the crystalline grain size of aged film is about 0.2 μm, and that of the as prepared one is 1.1 m. These phenomena are due to the more MAPbI₃ are generated during aging, which acts as more crystal nuclei that lead to smaller crystal grains and lower degree of crystallinity. This work provides a new idea and direction to explore the formation mechanism of methylamine lead iodide perovskite, which is the basic research of methylamine lead iodide perovskite thin film properties. The work has a certain guiding role in the practical production and industrial application in photovoltaic field.

Key words: methylamine lead iodine precursor thin films, aging process, variation, thermal annealing

MENG Yinxia, LI Zhanguo, FENG Yuxiang, ZHANG Jidong. Variation of the Methylamine Lead Iodine Precursor Thin Films During Aging and Its Influence on the Subsequent Perovskite Thin Films[J]. Chinese Journal of Applied Chemistry, 2017, 34(7): 818-823.

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Variation of the Methylamine Lead Iodine Precursor Thin Films During Aging and Its Influence on the Subsequent Perovskite Thin Films

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