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Seok, Sang Il
Laboratory for Energy Harvesting Materials and Systems
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Controllable synthesis of single crystalline Sn-based oxides and their application in perovskite solar cells

Author(s)
Yeom, Eun JooShin, Seong SikYang, Woon SeokLee, Seon JooYin, WenpingKim, DasomNoh, Jun HongAhn, Tae KyuSeok, Sang Il
Issued Date
2017-01
DOI
10.1039/C6TA08565B
URI
https://scholarworks.unist.ac.kr/handle/201301/21084
Fulltext
http://pubs.rsc.org/en/Content/ArticleLanding/2016/TA/C6TA08565B#!divAbstract
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v.5, no.1, pp.79 - 86
Abstract
We synthesized single-crystalline Sn-based oxides for use as electron-transporting layers (ETLs) in perovskite solar cells (PSCs). The control of the Zn-to-Sn cation ratio (Zn/Sn = 0-2) in a fixed concentration of hydrazine solution leads to the formation of various types of Sn-based oxides, i.e., spherical SnO2 and Zn2SnO4 nanoparticles (NPs), SnO2 nanorods, and Zn2SnO4 nanocubes. In particular, a ratio of Zn/Sn = 1 results in nanocomposites of single-crystalline SnO2 nanorods and Zn2SnO4 nanocubes. This is related to the concentration of free hydrazine unreacted with Zn and Sn ions in the reaction solution, because the resulting OH- concentration affects the growth rate of intermediate phases such as ZnSn(OH)(6), Zn(OH)(4)(2-) and Sn(OH)(6)(2-). Additionally, we propose plausible pathways for the formation of Sn-based oxides in hydrazine solution. The Sn-based oxides are applied as ETLs and annealed at a low temperature below 150 degrees C in PSCs. The PSCs fabricated by using the nanocomposite ETLs consisting of single-crystalline SnO2 nanorods and Zn2SnO4 nanocubes exhibit superior device performance to TiO2-based PSCs due to their excellent charge collection ability and optical properties, achieving a power conversion efficiency of >= 17%.
Publisher
ROYAL SOC CHEMISTRYROYAL SOC CHEMISTRY
ISSN
2050-7488
Keyword
HYDROTHERMAL SYNTHESISELECTRON-MOBILITYTIO2 FILMSTIN OXIDEGROWTHPERFORMANCEEXTRACTIONLAYERZNO

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