期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 3, 页码 1515-1524出版社
AMER CHEMICAL SOC
DOI: 10.1021/am404179z
关键词
photovoltaic; heterojunctions; solar; cells; boron; subphthalocyanines
资金
- Center for Interface Science: Solar Electric Materials (CISSEM), an Energy Frontier Research Center
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001084]
- National Science and Engineering Research Council of Canada (NSERC)
We have demonstrated that pentafluoro phenoxy boron subphthalocyanine (F(5)BsubPc) can function as either an electron donor or an electron acceptor layer in a planar heterojunction organic photovolatic (PHJ OPV) cell. F(5)BsubPc was incorporated into devices with the configurations ITO/MoO3/F(5)BsubPc/C-60/BCP/Al (F(5)BsubPc used as an electron-donor/hole-transport layer) and ITO/MoO3/Cl-BsubPc/F(5)BsubPc/BCP/Al (F(5)BsubPc used as an electron-acceptor/electron-transport layer). Each unoptimized device displayed open-circuit photopotentials (V-oc) close to or in excess of 1 V and respectrable power conversion efficiencies. Ultraviolet photoelectron spectroscopy (UPS) was used to characterize the band-edge offset energies at the donor/acceptor junctions. HOMO and LUMO energy level offsets for the F(5)BsubPc/C-60 heterojunction were determined to be ca. 0.6 eV and ca. 0.7 eV, respectively. Such offsets are clearly large enough to produce rectifying J/V responses, efficient exciton dissociation, and photocurrent production at the interface. For the Cl-BsubPc/F(5)BsubPc heterojunction, the estimated offset energies were found to be ca. 0.1 eV. However, reasonable photovoltaic activity was observed, with photocurrent production coming from both BsubPc species layers. Incident and absorbed photon power conversion efficiencies (IPCE and APCE) showed that photocurrent production qualitatively tracked the absorbance spectra of the donor/acceptor heterojunctions, with some additional photocurrent activity on the low energy side of the absorbance band. We suggest that photocurrent production at higher wavelengths may be a result of charge-transfer species at the donor/acceptor interface. Cascade photovoltaics were also fabricated to expand on the understanding of the role of F(5)BsubPc in such device architectures.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据