Long-term efficient organic photovoltaics based on quaternary bulk heterojunctions

Minwoo Nam, Minjeong Cha, Hyun Hwi Lee, Kahyun Hur, Kyu-Tae Lee, Jaehong Yoo, Il Ki Han, S. Joon Kwon () and Doo-Hyun Ko ()
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Minwoo Nam: Kyung Hee University
Minjeong Cha: Kyung Hee University
Hyun Hwi Lee: Pohang Accelerator Laboratory
Kahyun Hur: Computational Science Center, Korea Institute of Science and Technology
Kyu-Tae Lee: Kyung Hee University
Jaehong Yoo: Kyung Hee University
Il Ki Han: Nanophotonics Research Center, Korea Institute of Science and Technology
S. Joon Kwon: Nanophotonics Research Center, Korea Institute of Science and Technology
Doo-Hyun Ko: Kyung Hee University

Nature Communications, 2017, vol. 8, issue 1, 1-10

Abstract: Abstract A major impediment to the commercialization of organic photovoltaics (OPVs) is attaining long-term morphological stability of the bulk heterojunction (BHJ) layer. To secure the stability while pursuing optimized performance, multi-component BHJ-based OPVs have been strategically explored. Here we demonstrate the use of quaternary BHJs (q-BHJs) composed of two conjugated polymer donors and two fullerene acceptors as a novel platform to produce high-efficiency and long-term durable OPVs. A q-BHJ OPV (q-OPV) with an experimentally optimized composition exhibits an enhanced efficiency and extended operational lifetime than does the binary reference OPV. The q-OPV would retain more than 72% of its initial efficiency (for example, 8.42–6.06%) after a 1-year operation at an elevated temperature of 65 °C. This is superior to those of the state-of-the-art BHJ-based OPVs. We attribute the enhanced stability to the significant suppression of domain growth and phase separation between the components via kinetic trapping effect.

Date: 2017
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DOI: 10.1038/ncomms14068

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