Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 9, Issue 7, Pages 2326-2333Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ee00709k
Keywords
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Funding
- Center for Advanced Soft Electronics under the Global Frontier Research Program [NRF-2012M3A6A5055225]
- National Research Foundation of Korea (NRF) grant - Korea government (MSIP) [2015R1A2A1A10054230]
- National Research Foundation of Korea [2015R1A2A1A10054230, 2012M3A6A5055225] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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.
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