Self-Doped Conducting Polymer as a Hole-Extraction Layer in Organic-Inorganic Hybrid Perovskite Solar Cells
SCIE
SCOPUS
- Title
- Self-Doped Conducting Polymer as a Hole-Extraction Layer in Organic-Inorganic Hybrid Perovskite Solar Cells
- Authors
- Lim, K.-G; Ahn, S; Kim, H; Choi, M.-R; Huh, D.H; Lee, T.-W.
- Date Issued
- 2016-05-06
- Publisher
- WILEY-BLACKWELL
- Abstract
- Organic-inorganic hybrid perovskite solar cells are fabricated using a water-soluble, self-doped conducting polyaniline graft copolymer based on poly(4-styrenesulfonate)-g-polyaniline (PSS-g-PANI) as an efficient hole-extraction layer (HEL) because of its advantages, including low-temperature solution processability, high transmittance, and a low energy barrier with perovskite photoactive layers. Compared with conventional poly(3,4-ethylenedioxythiop hene): poly(styrene sulfonate) (PEDOT: PSS) dispersed in water solution, PSS-g-PANI molecules are dissolved in water because of the polymeric dopant covalently bonded with PANI, and can steadily remain as an initial solution during long-term storage and over a wide pH range to fabricate a HEL with fewer surface defects. The built-in potential and device characteristics are substantially improved because of the surface energy state of PSS-g-PANI below Fermi-energy level. Moreover, the PSS-g-PANI mixed with electron-withdrawing perfluorinated ionomer (PFI) exhibits a higher work function (5.49 eV) and deeper surface energy state below the Fermi level; thus, an ohmic contact at the HEL/methylammonium lead iodide perovskite interface is obtained. Finally, the power conversion efficiency was increased from 7.8% in the perovskite solar cells with PEDOT: PSS to 12.4% in those with the PSS-g-PANI: PFI.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/36107
- DOI
- 10.1002/ADMI.201500678
- ISSN
- 2196-7350
- Article Type
- Article
- Citation
- Advanced Materials Interfaces, vol. 3, no. 9, 2016-05-06
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- There are no files associated with this item.
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