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Realizing Efficient Charge/Energy Transfer and Charge Extraction in Fullerene-Free Organic Photovoltaics via a Versatile Third Component
Univ Calif Los Angeles, CA 90095 USA; Natl Chiao Tung Univ, Taiwan.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
Univ Calif Los Angeles, CA 90095 USA; Natl Chiao Tung Univ, Taiwan.
Natl Chiao Tung Univ, Taiwan.
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2019 (English)In: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 19, no 8, p. 5053-5061Article in journal (Refereed) Published
Abstract [en]

Solution-processed organic photovoltaics (OPVs) based on bulk-heterojunctions have gained significant attention to alleviate the increasing demend of fossil fuel in the past two decades. OPVs combined of a wide bandgap polymer donor and a narrow bandgap nonfullerene acceptor show potential to achieve high performance. However, there are still two reasons to limit the OPVs performance. One, although this combination can expand from the ultraviolet to the near-infrared region, the overall external quantum efficiency of the device suffers low values. The other one is the low open-circuit voltage (V-OC) of devices resulting from the relatively downshifted lowest unoccupied molecular orbital (LUMO) of the narrow bandgap. Herein, the approach to select and incorporate a versatile third component into the active layer is reported. A third component with a bandgap larger than that of the acceptor, and absorption spectra and LUMO levels lying within that of the donor and acceptor, is demonstrated to be effective to conquer these issues. As a result, the power conversion efficiencies (PCEs) are enhanced by the elevated short-circuit current and V-OC; the champion PCEs are 11.1% and 13.1% for PTB7-Th:IEICO-4F based and PBDB-T:Y1 based solar cells, respectively.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2019. Vol. 19, no 8, p. 5053-5061
Keywords [en]
Organic photovoltaics; nonfullerene; ternary blend; charge transfer; energy transfer; charge extraction
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:liu:diva-160051DOI: 10.1021/acs.nanolett.9b01344ISI: 000481563800032PubMedID: 31298866OAI: oai:DiVA.org:liu-160051DiVA, id: diva2:1349032
Note

Funding Agencies|Air Force Office of Scientific Research (AFOSR) [FA2386-18-1-4094]; Office of Naval Research (ONR) [N00014-17-1-2484]; UC-Solar Program [MRPI 328368]; Ministry of Education Subsidies for Universities and Tertiary Colleges to Develop International Bilateral Program to Jointly Train World Class Professionals, Taiwan; Center for Emergent Functional Matter Science of National Chiao Tung University from the Featured Areas Research Center Program within Ministry of Education (MOE), Taiwan; Ministry of Science and Technology, Taiwan [MOST 106-2221-E-009-132-MY3]

Available from: 2019-09-06 Created: 2019-09-06 Last updated: 2019-09-06

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