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Molecular Crystals and Liquid Crystals Volume 620, 2015 - Issue 1: KJF International Conference on Organic Materials for Electronics and Photonics 2014 (KJF-ICOMEP 2014)
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Original Articles

Solution-Processed NiO Layers for PTB7: PC71BM Organic Solar Cells

Koudai KiriishiCollege of Science and Technology, Nihon University, Narashinodai, Funabashi, Chiba, Japan
,
Kosei HashibaCollege of Science and Technology, Nihon University, Narashinodai, Funabashi, Chiba, Japan
,
Jiayu QiuCollege of Science and Technology, Nihon University, Narashinodai, Funabashi, Chiba, Japan
,
Tatsuki YanagidateCollege of Science and Technology, Nihon University, Narashinodai, Funabashi, Chiba, Japan
,
Masaya OhzekiCollege of Science and Technology, Nihon University, Narashinodai, Funabashi, Chiba, Japan
,
Shunjiro FujiiNanosystem Research Institute (NRI), National Institute of Advanced Industrial Science and Technology (AIST), Higashi, Tsukuba, Ibaraki, Japan
,
Hiromichi KatauraNanosystem Research Institute (NRI), National Institute of Advanced Industrial Science and Technology (AIST), Higashi, Tsukuba, Ibaraki, Japan
&
Yasushiro NishiokaCollege of Science and Technology, Nihon University, Narashinodai, Funabashi, Chiba, Japan
 show all
Pages 38-44 | Published online: 16 Dec 2015
 
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Abstract

Nickel oxide (NiO) has become attractive as a poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT :PSS) substitute in solar cells’ hole transport layers (HTLs). However, solar cells with NiO HTLs based on poly[[4,8-bis[(2-ethylhexyl)oxy]benzo [1,2-b:4,5-b′]dithiophene-2,6-diyl] [3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]-thiophenediyl] (PTB7) and [6,6]-phenyl C71 butyric acid methyl ester (PC71BM) remain poorly characterized. We report the effects of NiO-layer thickness on the performance of glass/ITO/NiO/PTB7:PC71BM/LiF/Al-structured solar cells. Thickness was optimized by changing nickel acetate tetrahydrate concentration in 2-methoxyethanol solution used for spin-coating deposition. We achieved a power conversion efficiency of 5.14% at 0.2 M of nickel acetate tetrahydrate. Solar cells with NiO HTLs exhibited improved long-term reliability.

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