Research Highlight

Excellent Long-​Term Stability of Power Conversion Efficiency in Non-​Fullerene-​Based Polymer Solar Cells Bearing Tricyanovinylene-​Functionalized n-​Type Small Molecules

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author Dong Hoon Choi
journal ACS Appl. Mater. Interfaces, 2017, 9 (10), pp 8838–8847(DOI:10.1021/acsami.6b15707)
Homepage http://fpl.korea.ac.kr/index2.asp
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New small molecules having modified acceptor strength and π-conjugation length and containing dicyanovinylene (DCV) and tricyanovinylene (TCV) as a strongly electron-accepting unit with indacenodithiophene, IDT(DCV)2, IDT(TCV)2, and IDTT(TCV)2, were synthesized and studied in terms of their applicability to polymer solar cells with PTB7-Th as an electron-donating polymer. Intriguingly, the blended films containing IDT(TCV)2 and IDTT(TCV)2 exhibited superior shelf life stabilities of more than 1000 h without any reduction in the initial power conversion efficiency. The low-lying lowest unoccupied molecular orbital energy levels and robust internal morphologies of small TCV-containing molecules could afford excellent shelf life stability.



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http://pubs.acs.org/doi/abs/10.1021/acsami.6b15707



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