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Title: Time-resolved neutron reflectometry and photovoltaic device studies on sequentially deposited PCDTBT-fullerenel layers
Authors: Clulow, AJ
Tao, C
Lee, KH
Velusamy, M
McEwan, JA
Shaw, PE
Yamada, NL
James, M
Burn, PL
Gentle, IR
Meredith, P
Keywords: Neutron reflectors
Solar cells
Issue Date: Sep-2014
Publisher: ACS Publications
Citation: Clulow, A. J., Tao, C., Lee, K. H., Velusamy, M., McEwan, J. A., Shaw, P. E., Yamada, N. L., James, M., Burn, P. L., Gentle, T. R., & Meredith, P. (2014). Time-resolved neutron reflectometry and photovoltaic device studies on sequentially deposited PCDTBT-fullerenel layers. Langmuir, 30(38), 11474-11484. doi:10.1021/la5020779
Abstract: We have used steady-state and time-resolved neutron reflectometry to study the diffusion of fullerene derivatives into the narrow optical gap polymer poly[N-9″-hepta-decanyl-2,7-carbazole-alt-5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole)] (PCDTBT) to explore the sequential processing of the donor and acceptor for the preparation of efficient organic solar cells. It was found that when [6,6]-phenyl-C61-butyric-acid-methyl-ester (60-PCBM) was deposited onto a thin film of PCDTBT from dichloromethane (DCM), a three-layer structure was formed that was stable below the glass-transition temperature of the polymer. When good solvents for the polymer were used in conjunction with DCM, both 60-PCBM and [6,6]-phenyl-C71-butyric-acid-methyl-ester (70-PCBM) were seen to form films that had a thick fullerene layer containing little polymer and a PCDTBT-rich layer near the interface with the substrate. Devices composed of films prepared by sequential deposition of the polymer and fullerene had efficiencies of up to 5.3%, with those based on 60-PCBM close to optimized bulk heterojunction (BHJ) cells processed in the conventional manner. Sequential deposition of pure components to form the active layer is attractive for large-area device fabrication, and the results demonstrate that this processing method can give efficient solar cells. © 2014, American Chemical Society.
Gov't Doc #: 6742
ISSN: 0743-7463
Appears in Collections:Journal Articles

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