Inverted polymer fullerene solar cells exceeding 10% efficiency with poly(2-ethyl-2-oxazoline) nanodots on electron-collecting buffer layers

Sungho Nam, Jooyeok Seo, Sungho Woo, Wook Hyun Kim, Hwajeong Kim (), Donal D. C. Bradley () and Youngkyoo Kim ()
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Sungho Nam: Organic Nanoelectronics Laboratory, School of Applied Chemical Engineering, Kyungpook National University
Jooyeok Seo: Organic Nanoelectronics Laboratory, School of Applied Chemical Engineering, Kyungpook National University
Sungho Woo: Daegu Gyeongbuk Institute of Science and Technology
Wook Hyun Kim: Daegu Gyeongbuk Institute of Science and Technology
Hwajeong Kim: Organic Nanoelectronics Laboratory, School of Applied Chemical Engineering, Kyungpook National University
Donal D. C. Bradley: Blackett Laboratory, Imperial College London
Youngkyoo Kim: Organic Nanoelectronics Laboratory, School of Applied Chemical Engineering, Kyungpook National University

Nature Communications, 2015, vol. 6, issue 1, 1-9

Abstract: Abstract Polymer solar cells have been spotlighted due to their potential for low-cost manufacturing but their efficiency is still less than required for commercial application as lightweight/flexible modules. Forming a dipole layer at the electron-collecting interface has been suggested as one of the more attractive approaches for efficiency enhancement. However, only a few dipole layer material types have been reported so far, including only one non-ionic (charge neutral) polymer. Here we show that a further neutral polymer, namely poly(2-ethyl-2-oxazoline) (PEOz) can be successfully used as a dipole layer. Inclusion of a PEOz layer, in particular with a nanodot morphology, increases the effective work function at the electron-collecting interface within inverted solar cells and thermal annealing of PEOz layer leads to a state-of-the-art 10.74% efficiency for single-stack bulk heterojunction blend structures comprising poly[4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b′]dithiophene-alt-3-fluorothieno[3,4-b]thiophene-2-carboxylate] as donor and [6,6]-phenyl-C71-butyric acid methyl ester as acceptor.

Date: 2015
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DOI: 10.1038/ncomms9929

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