Effect of photo-induced charge separated state lifetimes in donor-acceptor1-acceptor2 organic ambipolar semiconductors on their photovoltaic performances. (April 2017)

• Record Type: Journal Article
• Authors: Wang, Tianyang; Sun, Haiya; Zhang, Linli; Colley, Nathan D.; Bridgmohan, Chelsea N.; Liu, Dongzhi; Hu, Wenping; Li, Wei; Zhou, Xueqin; Wang, Lichang
• Is Part Of: Dyes and pigments. Volume 139(2017)
• Page Start: 601
• Page End: 610
• Publication Date: 2017-04
• Subjects: Donor-acceptor1-acceptor2 system -- s-triazine -- Fullerene -- Photo-induced electron transfer -- Single-layer organic solar cell -- Photovoltaic property; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2016.12.066
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: A newly ambipolar organic semiconductor with styrene based indoline derivative (YD) as the electron donor (D), s-triazine group (TRC) as the electron acceptor (A1 ), and fullerene derivative (NMF) as the second electron acceptor (A2 ) has been synthesized and characterized, which had a charge-separated state of 7.9 μs, corresponding to a 37 fold increase in comparison with the 215 ns lifetime of the D-A1 precursor. Here we compared photovoltaic properties of YD-TRC-NMF with those of other four D-TRC-A2 systems, which replaced indoline with triphenylamine (MTPA) and fullerene with perylene bisimide or anthraquinone (AEAQ), indicating that long-lived CS states are playing an important role in promoting photoelectric conversion in YD-TRC-AEAQ (or NMF) and MTPA-TRC-AEAQ, in which the short-circuit current and photoelectric conversion efficiency were significantly improved in comparison with YD-TRC and MTPA-TRC, respectively, due to triplet states of A2 being higher than charge-separated states. This proves that a general D-A1 -A2 architecture can become a reasonable materials design strategy for photovoltaics. Graphical abstract: Highlights: A newly fullerene based donor-acceptor1-acceptor2 system was synthesized and characterized. The lifetime of charge-separated state of the new system was up to 7.9 μs. Long-lived CS states were playing an important role in promoting photoelectric conversion.