期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 4, 页码 2912-2918出版社
AMER CHEMICAL SOC
DOI: 10.1021/am508332n
关键词
exciton; diffusion; OPV; SubPc; SubNc; cascade; energy transfer
资金
- National Science Foundation (NSF) [DMR-1307066]
- University of Minnesota Doctoral Dissertation Fellowship
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1307066] Funding Source: National Science Foundation
In planar heterojunction organic photovoltaic devices (OPVs), broad spectral coverage can be realized by incorporating multiple molecular absorbers in an energy-cascade architecture. Here, this approach is combined with a hostguest donor layer architecture previously shown to optimize exciton transport for the fluorescent organic semiconductor boron subphthalocyanine chloride (SubPc) when diluted in an optically transparent host. In order to maximize the absorption efficiency, energy-cascade OPVs that utilize both photoactive host and guest donor materials are examined using the pairing of SubPc and boron subnaphthalocyanine chloride (SubNc), respectively. In a planar heterojunction architecture, excitons generated on the SubPc host rapidly energy transfer to the SubNc guest, where they may migrate toward the dissociating, donoracceptor interface. Overall, the incorporation of a photoactive host leads to a 13% enhancement in the short-circuit current density and a 20% enhancement in the power conversion efficiency relative to an optimized hostguest OPV combining SubNc with a nonabsorbing host. This work underscores the potential for further design refinements in planar heterojunction OPVs and demonstrates progress toward the effective separation of functionality between constituent OPV materials.
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