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Dopant-free polymeric hole transport materials for highly efficient and stable perovskite solar cells
Title of paper Dopant-free polymeric hole transport materials for highly efficient and stable perovskite solar cells
Author [박태호교수 연구실]
Publication in journal Energy & Environmental Science 9, pp2326-2333 (July 2016)
Publication date 2016-07-01

[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 (∼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.


DOI: 10.1039/C6EE00709K

LINK: http://pubs.rsc.org/en/content/articlelanding/2016/ee/c6ee00709k#!divAbstract