Improved charge transport ability of polymer solar cells by using NPB/MoO^sub 3^ as anode buffer layer

Efficient polymer solar cells were fabricated with regioregular poly 3-hexylthiophene (P3HT):(6,6)-phenyl C61 butyric acid methyl ester (PCBM)) as active layer and molybdenum trioxide (MoO3) and (N,N′-diphenyl)-N,N′-bis(1-naphthyl)-1,1′-biphenyl-4,4′-diamine (NPB) as buffer layers. The results of tr...

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Bibliographic Details
Published in:Solar energy 2018-08, Vol.170, p.212
Main Authors: Li, Ping, Wu, Bo, Yang, You Chang, Huang, Hai Shen, Yang, Xiu De, Zhou, Guang Dong, Song, Qun Liang
Format: Article
Language:English
Subjects:
Biphenyl
Buffer layers
Butyric acid
Charge transport
Contact resistance
Conversion
Electrochemistry
Energy conversion efficiency
Energy efficiency
Molybdenum
Molybdenum oxides
Molybdenum trioxide
Performance enhancement
Photoelectric effect
Photoelectric emission
Photovoltaic cells
Recombination
Solar cells
Solar energy
Spectrometry
Studies
Thickness
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Summary:Efficient polymer solar cells were fabricated with regioregular poly 3-hexylthiophene (P3HT):(6,6)-phenyl C61 butyric acid methyl ester (PCBM)) as active layer and molybdenum trioxide (MoO3) and (N,N′-diphenyl)-N,N′-bis(1-naphthyl)-1,1′-biphenyl-4,4′-diamine (NPB) as buffer layers. The results of transient photocurrent and electrochemical impedance spectrometry of device indicate that the insertion of NPB layer between the active layer and MoO3 layer is critical to the enhanced performance. It can effectively prevent charge recombination at the interface of MoO3 hole extraction layer, reduce interfacial resistance due to the formation of Ohmic contact and enhance the exciton dissociation because of the newly formed NPB/PCBM dissociation interface. The optimized thickness of NPB layer is 5 nm, resulting in maximized power conversion efficiency (PCE) of 3.94% under AM1.5G 100 mW cm−2 illumination.
ISSN:0038-092X
1471-1257