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Surface potential mapping and n-type conductivity in organic-inorganic lead iodide crystals

Title
Surface potential mapping and n-type conductivity in organic-inorganic lead iodide crystals
Authors
Jung, Hye RiBich Phuong NguyenJin, Hye-JinTrang Thi Thu NguyenYoon, SeokhyunWoo, Won SeokAhn, Chang WonCho, ShinukKim, Ill WonJo, William
Ewha Authors
조윌렴윤석현
SCOPUS Author ID
조윌렴scopus; 윤석현scopus
Issue Date
2018
Journal Title
CRYSTENGCOMM
ISSN
1466-8033JCR Link
Citation
CRYSTENGCOMM vol. 20, no. 41, pp. 6551 - 6556
Publisher
ROYAL SOC CHEMISTRY
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
Organic-inorganic lead halide perovskites have drawbacks in applications due to insufficient and inadequate understanding of the materials. In particular, it is a priority to investigate CH3NH3PbI3 due to its suitable properties and its band gap energy of about 1.59 eV. In this work, we investigated the perovskite crystal with respect to structural, electronic, and optical properties because a single crystal is an ideal platform for examining essential characteristics. The spatial distribution of the perovskite structure was identified by transmission electron microscopy and Kelvin probe force microscopy. The built electronic structure is an important index for the carrier types depending on the surface potential distribution. In particular, a potential variation showed a mixture of the perovskite phase and a decomposed phase on the surface, which also implied the role of surface imperfections as initiation sites for degradation. Therefore, it is critical to verify the carrier types on the surface to enhance the possibilities of improvements for applications.
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DOI
10.1039/c8ce01229f
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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