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Facile synthesis of an efficient and robust cathode interface material for polymer solar cells

Bjuggren, Jonas M. and Sharma, Anirudh and Gedefaw, Desta and Elmas, Sait and Pan, Caroline and Kirk, Bradley and Zhao, Xianyuan and Andersson, Gunther and Andersson, Mats R. (2018) Facile synthesis of an efficient and robust cathode interface material for polymer solar cells. ACS Applied Energy Materials, 1 (12). pp. 7130-7139. ISSN 2574-0962

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In this study, an alcohol soluble novel naphthalene diimide (NDI)–thiophene-based cathode interface layer (CIL), PNDIT10N, is reported. PNDIT10N was synthesized in a facile three-step method, processed from environmentally friendly benzyl alcohol (BnOH) and employed in inverted polymer solar cells (PSCs). The three polymer donors TQ1, PTNT, and PTB7-Th were paired with the fullerene acceptor PC71BM for bulk heterojunction (BHJ) layers to evaluate the CIL. The modification of the indium tin oxide (ITO) electrode with a ∼3 nm thin layer of PNDIT10N yielded a significant reduction of 0.8 eV in the work function, reducing it from 4.6 to 3.8 eV, effectively transforming ITO to a functioning cathode. PSCs with a TQ1/PC71BM BHJ layer and incorporating a PNDIT10N interlayer were found to have a high Jsc value of 10.5 mA cm–2, Voc value of 909 mV, and an FF value of 68%, resulting in the highest PCE of 6.7% for TQ1 donor in the inverted device structure. Of note, the interface layer showed a good stability in ambient atmosphere for a 10 d indoor aging period, both in darkness and exposed to direct sunlight. Additionally, flexible PSCs incorporating slot-die coated PNDIT10N, processed from a BnOH–acetone solution, and BHJ layer in air achieved a PCE of 1.6%.

Item Type: Journal Article
Subjects: Q Science > QD Chemistry
Divisions: Faculty of Science, Technology and Environment (FSTE) > School of Biological and Chemical Sciences
Depositing User: Desta Gedefaw
Date Deposited: 21 Feb 2019 04:03
Last Modified: 21 Feb 2019 04:03

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