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나노 구조 물리 연구단
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Hierarchically Structured Hole Transport Layers of Spiro-OMeTAD and Multiwalled Carbon Nanotubes for Perovskite Solar Cells

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Title
Hierarchically Structured Hole Transport Layers of Spiro-OMeTAD and Multiwalled Carbon Nanotubes for Perovskite Solar Cells
Author(s)
Lee J.; Menamparambath M.M.; Jae-Yeol Hwang; Seunghyun Baik
Publication Date
2015-07
Journal
CHEMSUSCHEM, v.8, no.14, pp.2358 - 2362
Publisher
WILEY-V C H VERLAG GMBH
Abstract
The low electrical conductivity of spiro-OMeTAD hole transport layers impedes further enhancements of the power conversion efficiency (PCE) of perovskite solar cells. We embedded multiwalled carbon nanotubes (MWNTs) in spiro-OMeTAD (spiro-OMeTAD/MWNTs) to increase carrier mobility and conductivity. However, direct electrical contact between CH3NH3PbI3 and the MWNTs created pathways for undesirable back-electron transfer, owing to the large work function of MWNTs, limiting enhancements of the PCE. A hierarchical structure of pure spiro-OMeTAD and spiro-OMeTAD/MWNTs was designed to block back-electron transfer and fully exploit the enhanced charge transport of spiro-OMeTAD/MWNTs. The enhanced fill factor, short-circuit current density, open-circuit voltage, and PCE (15.1) were achieved by using this hierarchical hole transport layer structure (MWNT concentration=2wt). The perovskite solar cells were fabricated by a lowerature solution process, further decreasing their per-Watt cost. Respect the hierarchy! Multiwalled carbon nanotubes (MWNTs) are embedded in spiro-OMeTAD to improve electrical conductivity. Perovskite solar cells employing a hierarchical hole transport layer (HTL) structure, comprising pure spiro-OMeTAD and spiro-OMeTAD/MWNT layers, show better blocking of back-electron transfer while fully exploiting the enhanced conductivity of the spiro-OMeTAD/MWNT material. The power conversion efficiency of these perovskite solar cells is improved, to 15.1. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
URI
https://pr.ibs.re.kr/handle/8788114/1733
ISSN
1864-5631
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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