Performance Optimization of Parallel-Like Ternary Organic Solar Cells through Simultaneous Improvement in Charge Generation and Transport

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Title
Performance Optimization of Parallel-Like Ternary Organic Solar Cells through Simultaneous Improvement in Charge Generation and Transport
Author
Hadmojo, Wisnu TantyoWibowo, Febrian Tri AdhiLee, WooseopJang, Hye‐KyungKim, YeongsikSinaga, SeptyPark, MinsukJu, Sang‐YongRyu, Du YeolJung, In HwanJang, Sung‐Yeon
Issue Date
2019-04
Publisher
Wiley-VCH Verlag
Citation
ADVANCED FUNCTIONAL MATERIALS, v.29, no.14, pp.1808731
Abstract
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 NFA 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.
URI
https://scholarworks.unist.ac.kr/handle/201301/26742
URL
https://onlinelibrary.wiley.com/doi/full/10.1002/adfm.201808731
DOI
10.1002/adfm.201808731
ISSN
1616-301X
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