Journal
APPLIED PHYSICS LETTERS
Volume 94, Issue 2, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3072807
Keywords
aluminium; fullerenes; indium compounds; leakage currents; organic semiconductors; solar cells
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Funding
- Global Photonic Energy Corporation
- Air Force Office of Scientific Research
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We demonstrate high open circuit voltage photovoltaic cells achieved by reducing the electron leakage current through the introduction of both organic and inorganic electron blocking layers between the donor layer and the anode contact. As an example, the blocking layers reduce the dark current in tin (II) phthalocyanine (SnPc)/C-60 solar cells with response across the visible and near infrared spectral region up to a wavelength of 1000 nm, is decreased by two orders of magnitude compared to cells lacking the layers, resulting in a doubling of the open circuit voltage. The structure: indium tin oxide/electron blocker/SnPc (100 A)/C-60 (400 A)/bathocuproine (100 A)/Al, has a power conversion efficiency of (2.1 +/- 0.1)% at 1 sun, standard AM1.5G solar illumination. This work demonstrates the importance of reducing dark current to achieve high organic thin film photovoltaic cell efficiencies.
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