期刊
ADVANCED ENERGY MATERIALS
卷 9, 期 14, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201900044
关键词
morphology; nonfullerene acceptors; organic photovoltaic cells; photoactive layers; side chain engineering; surface energy matching
类别
资金
- GIST Research Institute (GRI) grant - GIST
- Technology Development Program to Solve Climate Change of the National Research Foundation (NRF) - Ministry of Science, ICT and Future Planning [NRF-2015M1A2A2057510]
- Global Research Laboratory Program of the NRF - Ministry of Science, ICT and Future Planning [NRF-2017K1A1A2013153]
- Korea Institute of Energy Technology Evaluation and Planning
- Ministry of Trade, Industry and Energy of the Republic of Korea [20173010013000]
- Mid-career Researcher Program of the NRF - Ministry of Science, ICT and Future Planning [NRF-2018R1A2A1A05078734]
- Ministry of Science, ICT & Future Planning, Republic of Korea [GIST-14] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [21A20151713274, 21A20151513130] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Although high power conversion efficiency of over 14% has been achieved using nonfullerene acceptors (NFAs) in organic photovoltaics (OPVs), securing their insensitive device performance to the thickness of the photoactive layer remains an indispensable requirement for their successful commercialization via printing technologies. In this study, by synthesizing a new series of ITIC-based NFAs having alkyl or alkoxy groups, it is found that the bulk heterojunction morphology dependence on the thickness of the photoactive layer becomes more severe as the difference in the surface energy of the donor and acceptor increases. It is believed that this observation is the origin that yields the device performance dependence on the thickness of the photoactive layer. Through sensitive control of the surface energy of these ITIC-based NFAs, it is demonstrated that thickness-insensitive OPVs can be achieved even using a doctor blade technique under air without using any additives. It is believed that present approach provides an important insight into the design of photoactive materials and morphology control for the printable OPVs using NFAs.
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