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Shin, Tae Joo
UNIST Synchrotron Radiation Research Laboratory
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  • Synchrotron Radiation Application Researches

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Two different mechanisms of CH3NH3PbI3 film formation in one-step deposition and its effect on photovoltaic properties of OPV-type perovskite solar cells

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Title
Two different mechanisms of CH3NH3PbI3 film formation in one-step deposition and its effect on photovoltaic properties of OPV-type perovskite solar cells
Author
Bae, SeunghwanHan, Seung JinShin, Tae JooJo, Won Ho
Issue Date
2015-10
Publisher
ROYAL SOC CHEMISTRYROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v.3, no.47, pp.23964 - 23972
Abstract
Although the one-step deposition method has intensively been studied because of the simple and easy fabrication of perovskite films, uncontrolled crystallization of perovskite during one-step deposition often results in films with small crystallites and low surface coverage, leading to low photovoltaic performance. In this study, we have proposed the optimum processing conditions to afford a favorable crystal morphology of perovskite films for achieving high power conversion efficiency of perovskite solar cells. Two different morphologies, tree-like and flower-like morphologies, are developed depending upon the spin-coating time and post-heat treatment temperature. When the perovskite is crystallized from the liquid film after a short spin-coating time, the flower-like morphology is developed, whereas the treelike morphology is developed when the perovskite is crystallized for a long spin-coating time. When the morphology evolution is monitored using in situ optical microscopy and X-ray diffraction to investigate the origin of the difference between tree-like and flower-like morphologies, it reveals that the CH3NH3I-PbI2-solvent complex is formed to develop the tree-like morphology before CH3NH3PbI3 crystals are formed, whereas the flower-like morphology is developed when the CH3NH3PbI3 crystals are formed directly from the liquid film without the formation of the CH3NH3I-PbI2-solvent complex. The film with a flower-like morphology, as prepared from DMSO solution, has large-sized crystallites, and the crystallites are highly orientated along (112) and (200) directions, resulting in a high PCE of 13.85%, whereas the film with a tree-like morphology has small-sized crystallites with random crystal orientation, exhibiting very low PCEs.
URI
https://scholarworks.unist.ac.kr/handle/201301/17953
URL
http://pubs.rsc.org/en/Content/ArticleLanding/2015/TA/C5TA06870C#!divAbstract
DOI
10.1039/c5ta06870c
ISSN
2050-7488
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