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장성연

Jang, Sung-Yeon
Renewable Energy and Nanoelectronics Lab.
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Simultaneous Improvement in Efficiency and Stability of Low-Temperature-Processed Perovskite Solar Cells by Interfacial Control

Author(s)
Azmi, RandiLee, Chang-LyoulJung, In HwanJang, Sung-Yeon
Issued Date
2018-05
DOI
10.1002/aenm.201702934
URI
https://scholarworks.unist.ac.kr/handle/201301/26766
Fulltext
https://onlinelibrary.wiley.com/doi/full/10.1002/aenm.201702934
Citation
ADVANCED ENERGY MATERIALS, v.8, no.14
Abstract
In most current state-of-the-art perovskite solar cells (PSCs), high-temperature (approximate to 500 degrees C)-sintered metal oxides are employed as electron-transporting layers (ETLs). To lower the device processing temperature, the development of low-temperature-processable ETL materials (such as solution-processed ZnO) has received growing attention. However, thus far, the use of solutionprocessed ZnO is limited because the reverse decomposition reaction that occurs at ZnO/perovskite interfaces significantly degrades the charge collection and stability of PSCs. In this work, the reverse decomposition reaction is successfully retarded by sulfur passivation of solution-processed ZnO. The sulfur passivation of ZnO by a simple chemical means, efficiently reduces the oxygen-deficient defects and surface oxygen-containing groups, thus effectively preventing reverse decomposition reactions during and after formation of the perovskite active layers. Using the low-temperature-processed sulfurpassivated ZnO (ZnO-S), perovskite layers with higher crystallinity and larger grain size are obtained, while the charge extraction at the ZnO/perovskite interface is significantly improved. As a result, the ZnO-S-based PSCs achieve substantially improved power-conversion-efficiency (PCE) (19.65%) and long-term air-storage stability (90% retention after 40 d) compared with pristine ZnO-based PSCs (16.51% and 1% retention after 40 d). Notably, the PCE achieved is the highest recorded (19.65%) for low-temperature ZnObased PSCs.
Publisher
WILEY-V C H VERLAG GMBH
ISSN
1614-6832
Keyword (Author)
long-term air stabilitylow-temperature processingperovskite solar cellssurface defectszinc oxide
Keyword
ELECTRON-TRANSPORT LAYERSHIGHLY EFFICIENTPHOTOVOLTAIC PERFORMANCEZINC-OXIDEMETAL-OXIDEZNONANOPARTICLESPASSIVATIONCH3NH3PBI3FILMS

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