Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 2, Pages 1214-1219Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b09620
Keywords
ternary layer; vacuum deposition; energy transfer; broad absorption; cascade energy levels
Funding
- Brain Korea (BK) 21 Plus through a National Research Foundation (NRF) grant - Ministry of Science, ICT and Future Planning (MSIP)
- Mid-Career Researcher Program through a National Research Foundation (NRF) grant - Ministry of Science, ICT and Future Planning (MSIP) [2014R1A2A1A01002030]
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The use of multiple donors in an active layer is an effective way to boost the efficiency of organic solar cells by broadening their absorption window. Here, we report an efficient vacuum-deposited ternary organic photovoltaic (OPV) using two donors, 2-((2-(5-(4-(diphenylamino)phenyl)thieno[3,2-b]thiophen-2-yl)thiazol-5-yl)methylene)malononitrile (DTTz) for visible absorption and 2-((7-(5-(dip-tolylamino)thiophen-2-yl)benzo[c]-[1,2,5]thiadiazol-4-yl)methylene)malononitrile (DTDCTB) for near-infrared absorption, codeposited with C-70 in the ternary layer. The ternary device achieved a power conversion efficiency of 8.02%, which is 23% higher than that of binary OPVs. This enhancement is the result of incorporating two donors with complementary absorption covering wavelengths of 350 to 900 nm with higher hole mobility in the ternary layer than that of binary layers consisting of one donor and C-70, combined with energy transfer from the donor with lower hole mobility (DTTz) to that with higher mobility (DTDCTB). This structure fulfills all the requirements for efficient ternary OPVs.
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