Near-Infrared Azadipyrromethenes as Electron Donor for Efficient Planar Heterojunction Organic Solar Cells
Authors:
- 16 October 2011
- journal article
- research article
- Published by American Chemical Society (ACS) in ACS Applied Materials & Interfaces
- Vol. 3 (11) , 4469-4474
Abstract
We report the use of three solution processable azadipyrromethene (ADPM) based compounds, i.e., ADPM, B,F2-chelated ADPM (BF2-ADPM), and B,O-chelated ADPM (BO-ADPM), as electron donors in planar heterojunction solar cells. These small molecules possess exceptional light harvesting capability with high extinction coefficients (∼1 × 105 M–1 cm–1 in solutions) and broad absorption spectra up into the near-infrared region. Planar heterojunction organic solar cells, consisting of a solution processed electron donor layer and a vapor deposited C60 acceptor layer, have been constructed to give power conversion efficiencies of 0.56, 0.69, and 2.63% for ADPM, BF2-ADPM, and BO-ADPM, respectively, under AM 1.5G simulated 1 sun solar illumination. A high open circuit voltage (Voc) of ∼0.8 V was achieved for the BO-ADPM/C60 device, which is among the highest reported values for organic solar cells with photocurrent generation in the near-infrared region beyond 1.5 eV.Keywords
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