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 3.78% at 0.2 M of nickel acetate tetrahydrate.
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