Dopant-free polymeric hole transport materials for highly efficient and stable perovskite solar cells
SCIE
SCOPUS
- Title
- Dopant-free polymeric hole transport materials for highly efficient and stable perovskite solar cells
- Authors
- Guan-Woo Kim; Gyeongho Kang; Jinseck Kim; Gang-Young Lee; Hong Il Kim; Limok Pyeon; Jaechol Lee; Park, T.
- Date Issued
- 2016-04
- Publisher
- ROYAL SOCIETY OF CHEMISTRY
- Abstract
- We report a dopant-free polymeric hole transport material (HTM) that is based on benzo[1,2-b:4,5:b']-dithiophene and 2,1,3-benzothiadiazole, which results in highly efficient and stable perovskite solar cells (similar to 17.3% for over 1400 h at 75% humidity). The HTM comprises a random copolymer (RCP), which is characterized using UV-vis absorption spectroscopy, cyclic voltammetry, space-charge-limited current, and grazing-incidence wide-angle X-ray scattering. The RCP-based perovskite solar cell exhibits the highest efficiency (17.3%) in the absence of dopants [lithium bis (trifluoromethanesulfonyl) imide and tert-butylpyridine]. The observed efficiency is attributed to a deep HOMO energy level and high hole mobility. In addition, the long-term stability of the device is dramatically improved by avoiding deliquescent or hygroscopic dopants and by introducing a hydrophobic polymer layer. RCP devices maintain their initial efficiency for over 1400 h at 75% humidity, whereas devices made of HTMs with additives fail after 900 h.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/36666
- DOI
- 10.1039/C6EE00709K
- ISSN
- 1754-5692
- Article Type
- Article
- Citation
- ENERGY ENVIRONMENTAL SCIENCE, vol. 9, no. 7, page. 2326 - 2333, 2016-04
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