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Open AccessArticle

Influence of Weak Base Addition to Hole-Collecting Buffer Layers in Polymer:Fullerene Solar Cells

1
Organic Nanoelectronics Laboratory and KNU Institute for Nanophotonics Applications (KINPA), Department of Chemical Engineering, School of Applied Chemical Engineering, Kyungpook National University, Daegu 41566, Korea
2
Advanced Composites Materials Technical Center, Toray Advanced Materials Korea, Gumi-Si, Gyeongbook 39422, Korea
3
Priority Research Center, Research Institute of Advanced Energy Technology, Kyungpook National University, Daegu 41566, Korea
*
Author to whom correspondence should be addressed.
Molecules 2017, 22(2), 262; https://doi.org/10.3390/molecules22020262
Received: 13 January 2017 / Accepted: 4 February 2017 / Published: 9 February 2017
(This article belongs to the Special Issue Advances in Organic Nanophotonics)
We report the effect of weak base addition to acidic polymer hole-collecting layers in normal-type polymer:fullerene solar cells. Varying amounts of the weak base aniline (AN) were added to solutions of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS). The acidity of the aniline-added PEDOT:PSS solutions gradually decreased from pH = 1.74 (AN = 0 mol% ) to pH = 4.24 (AN = 1.8 mol %). The electrical conductivity of the PEDOT:PSS-AN films did not change much with the pH value, while the ratio of conductivity between out-of-plane and in-plane directions was dependent on the pH of solutions. The highest power conversion efficiency (PCE) was obtained at pH = 2.52, even though all devices with the PEDOT:PSS-AN layers exhibited better PCE than those with the pristine PEDOT:PSS layers. Atomic force microscopy investigation revealed that the size of PEDOT:PSS domains became smaller as the pH increased. The stability test for 100 h illumination under one sun condition disclosed that the PCE decay was relatively slower for the devices with the PEDOT:PSS-AN layers than for those with pristine PEDOT:PSS layers. View Full-Text
Keywords: polymer:fullerene solar cells; hole-collecting layer; PEDOT:PSS; weak base; aniline; pH; power conversion efficiency; stability polymer:fullerene solar cells; hole-collecting layer; PEDOT:PSS; weak base; aniline; pH; power conversion efficiency; stability
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MDPI and ACS Style

Seo, J.; Park, S.; Song, M.; Jeong, J.; Lee, C.; Kim, H.; Kim, Y. Influence of Weak Base Addition to Hole-Collecting Buffer Layers in Polymer:Fullerene Solar Cells. Molecules 2017, 22, 262. https://doi.org/10.3390/molecules22020262

AMA Style

Seo J, Park S, Song M, Jeong J, Lee C, Kim H, Kim Y. Influence of Weak Base Addition to Hole-Collecting Buffer Layers in Polymer:Fullerene Solar Cells. Molecules. 2017; 22(2):262. https://doi.org/10.3390/molecules22020262

Chicago/Turabian Style

Seo, Jooyeok; Park, Soohyeong; Song, Myeonghun; Jeong, Jaehoon; Lee, Chulyeon; Kim, Hwajeong; Kim, Youngkyoo. 2017. "Influence of Weak Base Addition to Hole-Collecting Buffer Layers in Polymer:Fullerene Solar Cells" Molecules 22, no. 2: 262. https://doi.org/10.3390/molecules22020262

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