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Aqueous Processed All-Polymer Solar Cells with High Open-Circuit Voltage Based on Low-Cost Thiophene-Quinoxaline Polymers
Chalmers University of Technology, Sweden; Addis Ababa University, Ethiopia.ORCID iD: 0009-0001-7325-7857
Korea Advanced Institute of Science and Technology (KAIST), South Korea.
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics (from 2013).ORCID iD: 0000-0002-8692-3396
Chalmers University of Technology, Sweden.
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2024 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 16, no 10, p. 12886-12896Article in journal (Refereed) Published
Abstract [en]

Eco-friendly solution processing and the low-cost synthesis of photoactive materials are important requirements for the commercialization of organic solar cells (OSCs). Although varieties of aqueous-soluble acceptors have been developed, the availability of aqueous-processable polymer donors remains quite limited. In particular, the generally shallow highest occupied molecular orbital (HOMO) energy levels of existing polymer donors limit further increases in the power conversion efficiency (PCE). Here, we design and synthesize two water/alcohol-processable polymer donors, poly[(thiophene-2,5-diyl)-alt-(2-((13-(2,5,8,11-tetraoxadodecyl)-2,5,8,11-tetraoxatetradecan-14-yl)oxy)-6,7-difluoroquinoxaline-5,8-diyl)] (P(Qx8O-T)) and poly[(selenophene-2,5-diyl)-alt-(2-((13-(2,5,8,11-tetraoxadodecyl)-2,5,8,11-tetraoxatetradecan-14-yl)oxy)-6,7-difluoroquinoxaline-5,8-diyl)] (P(Qx8O-Se)) with oligo(ethylene glycol) (OEG) side chains, having deep HOMO energy levels (similar to-5.4 eV). The synthesis of the polymers is achieved in a few synthetic and purification steps at reduced cost. The theoretical calculations uncover that the dielectric environmental variations are responsible for the observed band gap lowering in OEG-based polymers compared to their alkylated counterparts. Notably, the aqueous-processed all-polymer solar cells (aq-APSCs) based on P(Qx8O-T) and poly[(N,N '-bis(3-(2-(2-(2-methoxyethoxy)-ethoxy)ethoxy)-2-((2-(2-(2-methoxyethoxy)ethoxy)ethoxy)-methyl)propyl)naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl)-alt-(2,5-thiophene)] (P(NDIDEG-T)) active layer exhibit a PCE of 2.27% and high open-circuit voltage (V-OC) approaching 0.8 V, which are among the highest values for aq-APSCs reported to date. This study provides important clues for the design of low-cost, aqueous-processable polymer donors and the fabrication of aqueous-processable OSCs with high V-OC.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2024. Vol. 16, no 10, p. 12886-12896
Keywords [en]
oligo(ethylene glycol), low-cost, aqueous-processable, all-polymer solar cell, eco-compatibility, open-circuit voltage
National Category
Polymer Chemistry Textile, Rubber and Polymeric Materials
Research subject
Physics
Identifiers
URN: urn:nbn:se:kau:diva-99027DOI: 10.1021/acsami.3c18994ISI: 001179270000001PubMedID: 38425182Scopus ID: 2-s2.0-85186379387OAI: oai:DiVA.org:kau-99027DiVA, id: diva2:1847136
Funder
Swedish Research Council, (2019-04683, 2020-05223Swedish Energy Agency, 45420-1Swedish Research Council Formas, P2021-90067Available from: 2024-03-26 Created: 2024-03-26 Last updated: 2024-04-04Bibliographically approved

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Franco, Leandro R.Marchiori, CleberAraujo, Moyses

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Filate, Tadele T.Franco, Leandro R.Marchiori, CleberAraujo, Moyses
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