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Time-resolved Neutron Reflectometry and Photovoltaic Device Studies on Sequentially Deposited PCDTBT-fullerene Layers

Time-resolved Neutron Reflectometry and Photovoltaic Device Studies on Sequentially Deposited PCDTBT-fullerene Layers

Andrew J Clulow, Chen Tao, Kwan H Lee, Marappan Velusamy, Jake A McEwan, Paul E Shaw, Norifumi L Yamada, Michael James, Paul L Burn, Ian R Gentle, Paul Meredith

Langmuir. 2014 Sep 30;30(38):11474-84.

PMID: 25222029

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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
LS76132	[6,6]-Thienyl C61 butyric acid methyl ester			Price

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