期刊
ADVANCED FUNCTIONAL MATERIALS
卷 29, 期 14, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201808731
关键词
low energy loss; nanomorphology; nonfullerene acceptor; organic photovoltaic device; parallel-linked ternary
类别
资金
- New and Renewable Energy Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) from the Ministry of Trade, Industry and Energy, Republic of Korea [20163030013960]
- National Research Foundation (NRF) - Korean Government (MSIP) [2016R1A5A1012966, 2017R1A2B2009178]
- Global Scholarship Program for Foreign Graduate Students at Kookmin University in Korea
- National Research Foundation of Korea [2017R1A2B2009178] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Ternary organic photovoltaic (OPV) devices with multiple light-absorbing active materials have emerged as an efficient strategy for realizing further improvements in the power conversion efficiency (PCE) without building complex multijunction structures. However, the third component often acts as recombination centers and, hence, the optimization of ternary blend morphology poses a major challenge to improving the PCE of these devices. In this work, the performance of OPVs is enhanced through the morphological modification of nonfullerene acceptor (NFA)-containing binary active layers. This modification is achieved by incorporating fullerenes into the layers. The uniformly dispersed fullerenes are sufficiently continuous and successfully mediate the ordering of N FA without charge or energy transfer. Owing to the simultaneous improvement in the charge generation and extraction, the PCE (12.1%) of these parallel-linked ternary devices is considerably higher than those of the corresponding binary devices (9.95% and 7.78%). Moreover, the additional energy loss of the ternary device is minimized, compared with that of the NFA-based binary device, due to the judicious control of the effective donor:acceptor composition of the ternary blends.
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