Journal
ADVANCED ENERGY MATERIALS
Volume 8, Issue 32, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201802021
Keywords
alkyl substituted acceptors; all-small-molecule; chlorination; pentathiophene
Categories
Funding
- NSFC [51773095, 91633301]
- MoST of China [2014CB643502]
- MoST of Tianjin city [17JCJQJC44500, 17JCZDJC31100]
- 111 Project [B12015]
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While a wide variety of nonfullerene acceptors are developed and perform well in combination with polymer donors, only a few nonfullerene acceptors can work well with small molecule donors. Here, all-small-molecule solar cells with high performance enabled by a new type of small molecule acceptors (F-0Cl, F-1Cl, and F-2Cl), which contain linear alkyl side chains and end groups substituted with various number of chlorine atoms, are reported. End group chlorination leads to redshifted absorption, enhanced crystallinity, and high electron mobility. These properties make them competitive as electron acceptors for all-small-molecule solar devices. When combined with two popular small molecule donors DRTB-T and DRCN5T, these nonfullerene acceptors offer power conversion efficiencies up to 10.76 and 9.89%, which are among the top efficiencies reported in all-small-molecule solar cells and indicate the great potential of all-small-molecule solar devices.
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