期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 1, 页码 662-669出版社
AMER CHEMICAL SOC
DOI: 10.1021/am506874k
关键词
organic photovoltaics; BODIPY; bilayer; planar-mixed heterojunction; neutron reflectivity
资金
- Nanoflex Power Corporation
- Center for Advanced Molecular Photovoltaics (CAMP) of the King Abdullah University of Science and Technology (KAUST) [KUS-C1-015-21]
A benzannulated boron dipyrromethene (BODIPY, bDIP) molecule exhibiting strong absorption at 640 nm was synthesized. The organic dye was used in an organic solar cell as the electron donor with C-60 as the acceptor. The BODIPY dye demonstrated the best performance in lamellar architecture (indium tin oxide (ITO)/bDIP/C-60/bathocuproine/Al), giving power conversion efficiency up to 4.5% with short-circuit current (J(SC)) of 8.7 mA/cm(2) and an open-circuit voltage (V-OC) of 0.81 V. Neutron reflectivity experiments were performed on the bilayer film to investigate the thickness dependence of JSC. A 13 nm mixed layer was found to be present at the donor/acceptor interface in the bilayer device, formed when the C-60 was deposited onto a room temperature bDIP film. Planar-mixed heterojunction devices were fabricated to understand the extent of spontaneous mixing between the donor and acceptor materials. The native mixed region in the bilayer device was shown to most resemble 1:3 bDIP:C-60 layer in the structure: (ITO/bDIP/bDIP:C-60 blend/C-60/bathocuproine/Al).
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