Tuning the Energy Level Offset between Donor and Acceptor with Ferroelectric Dipole Layers for Increased Efficiency in Bilayer Organic Photovoltaic Cells

2012 ◽  
Vol 24 (11) ◽  
pp. 1455-1460 ◽  
Author(s):  
Bin Yang ◽  
Yongbo Yuan ◽  
Pankaj Sharma ◽  
Shashi Poddar ◽  
Rafal Korlacki ◽  
...  
Keyword(s):  
Energy Level ◽  
Photovoltaic Cells ◽  
Organic Photovoltaic ◽  
Organic Photovoltaic Cells ◽  
Donor And Acceptor

Energy Level Alignment at Fullerene/Phthalocyanine Interface Studied by Electron Spectroscopies

2003 ◽  
Vol 771 ◽  
Author(s):  
Hisao Ishii ◽  
Atsushi Seko ◽  
Akira Kawakami ◽  
Kazunori Umishita ◽  
Yukio Ouchi ◽  
...  
Keyword(s):  
Energy Level ◽  
Photovoltaic Cells ◽  
Energy Shift ◽  
Metal Electrode ◽  
Organic Photovoltaic ◽  
Level Shift ◽  
Organic Photovoltaic Cells ◽  
Interface Formation ◽  
Band Bending ◽  
Energy Level Alignment

AbstractInterfacial band offset and band bending of organic semiconductors are critical to understand and improve organic photovoltaic cells. In this study, the energy level alignment of fullerene(C60) / metal-free phthalocyanine (H2Pc) interface which is one of the model interfaces of organic photovoltaic cells has been investigated using UV and X-ray photoemissions. For both ‘H2Pc on C60’ and “C60 on H2Pc' interfaces, 0.3 eV downward energy level shift was observed in XPS at the interface formation. This energy shift is quite steep in contrast to the band bending observed for C60/metal interfaces in our previous study, where thickness of 500nm was required to achieve 0.21eV band bending to get Fermi level alignment between metal electrode and C60. To clarify the origin of the band bending, the effect of the insertion of C60-H2Pc co-deposited layer between C60 and H2Pc layers was also investigated. The result suggested that possible doping of H2Pc to C60 is not main origin of the observed energy shift. We also found that the vacuum level shift at H2Pc/C60 interface is strongly dependent on the deposition sequence of the interface formation.

scholarly journals Organic Photovoltaic Cells Based on PbPc Nanocolumns Prepared by Glancing Angle Deposition

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Yang Liu ◽  
Fujun Zhang ◽  
Jian Wang
Keyword(s):  
Electron Donor ◽  
Electron Acceptor ◽  
Photovoltaic Cells ◽  
Glancing Angle Deposition ◽  
Illumination Intensity ◽  
Organic Photovoltaic ◽  
Organic Photovoltaic Cells ◽  
Donor And Acceptor ◽  
Glancing Angle ◽  
Angle Deposition

Organic small material lead phthalocyanine (PbPc) nanocolumns were prepared via glancing angle deposition (GLAD) on indium tin oxide (ITO) coated glass substrates. Organic electron acceptor materials fullerene (C60) was evaporated onto the nanocolumn PbPc thin films to prepare heterojunction structure ITO/PbPc/C60/Bphen/Al organic photovoltaic cells (OPVs). It is worthwhile to mention that C60molecules firstly fill the voids between PbPc nanocolumns and then form impact C60layer. The interpenetrating electron donor/acceptor structure effectively enhances interface between electron donor and electron acceptor, which is beneficial to exciton dissociation. The short circuit current density (Jsc) of organic photovoltaic devices (OPVs) based on PbPc nanocolumn was increased from 1.19 mA/cm2to 1.74 mA/cm2, which should be attributed to the increase of interface between donor and acceptor. The effect of illumination intensity on the performance of OPVs was investigated by controlling the distance between light source and sample, and theJscof two kind of OPVs was increased along with the increase of illumination intensity.

scholarly journals Effects of Au Nanoparticle Addition to Hole Transfer Layer in Organic Photovoltaic Cells Based on Phthalocyanines and Fullerene

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Akihiko Nagata ◽  
Takeo Oku ◽  
Tsuyoshi Akiyama ◽  
Atsushi Suzuki ◽  
Yasuhiro Yamasaki ◽  
...  
Keyword(s):  
Energy Levels ◽  
Photovoltaic Cells ◽  
Organic Photovoltaic ◽  
Au Nanoparticle ◽  
Molecular Orbital Calculations ◽  
Organic Photovoltaic Cells ◽  
Transfer Layer ◽  
Hole Transfer ◽  
Transmission Electron ◽  
Conversion Efficiencies

Phthalocyanines/fullerene organic photovoltaic cells were fabricated and characterized. Effects of Au nanoparticle addition to a hole transfer layer were also investigated, and power conversion efficiencies of the photovoltaic cells were improved after blending the Au nanoparticle into PEDOT:PSS. Nanostructures of the Au nanoparticles were investigated by transmission electron microscopy and X-ray diffraction. Energy levels of molecules were calculated by molecular orbital calculations, and the nanostructures and electronic property were discussed.

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