Long-term efficient organic photovoltaics based on quaternary bulk heterojunctions

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 de...

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Published in:Nature communications 2017-01, Vol.8 (1), p.14068-14068, Article 14068
Main Authors: Nam, Minwoo, Cha, Minjeong, Lee, Hyun Hwi, Hur, Kahyun, Lee, Kyu-Tae, Yoo, Jaehong, Han, Il Ki, Kwon, S. Joon, Ko, Doo-Hyun
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Energy
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Polymers
Science
Science (multidisciplinary)
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container_title Nature communications
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creator Nam, Minwoo
Cha, Minjeong
Lee, Hyun Hwi
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Han, Il Ki
Kwon, S. Joon
Ko, Doo-Hyun
description 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. Organic photovoltaics suffer from degradation. Here, Nam et al . develop a quaternary blend and fabricate devices which lose 28% of their initial efficiency after one year of operation at 65 °C.
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subjects 639/4077/909/4101/4096/946
639/925/357/995
Energy
Fullerenes
Humanities and Social Sciences
Morphology
multidisciplinary
Polymers
Science
Science (multidisciplinary)
title Long-term efficient organic photovoltaics based on quaternary bulk heterojunctions
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