Journal
DYES AND PIGMENTS
Volume 193, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2021.109506
Keywords
Thiophene; Perovskite solar cells; Hole transporting materials; Long-time stability
Funding
- National Key R&D Program of China [2017YFB1300101]
- National Natural Science Foundation of China [51603055, 22072034, 22001050]
- Postdoctoral Scientific Research Developmental Fund of Heilongjiang Province [LBH-Q20018]
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Two novel benzodithieno [3,2-b]thiophene-cored hole-transporting materials were synthesized and demonstrated to be promising for constructing high-stability perovskite solar cells.
Two novel benzodithieno [3,2-b]thiophene-cored hole-transporting materials (HTMs), DTmBDT-TPA and DTmBDT-OMeTPA were synthesized and their thermal, photophysical, and electrochemical characteristics were systematically investigated. The devices based on DTmBDT-TPA and DTmBDT-OMeTPA exhibited power conversion efficiencies of 16.62% and 18.22%, respectively. The S atoms in thiophene moieties were involved in the passivation interaction with perovskite; accordingly, the long-term stabilities of both DTmBDT-based perovskite solar cells (PSCs) were superior to that of the 2,2 ',7,7 '-tetrakis (N,N-di-p-methoxyphenylamine)-9,9 '-spirobifluorene (spiro-OMeTAD)-based PSC. After 1440 h storage, the unencapsulated DTmBDT-TPA- and DTmBDTOMeTPA-based PSCs retained over 81% and 90% of their initial efficiencies, respectively; whereas, the spiroOMeTAD device lost approximately 50% of its original efficiency. These results show that DTmBDT-based compounds are promising HTMs for constructing high-stability PSCs.
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