title: Near-infrared azadipyrromethenes as electron donor for efficient planar heterojunction organic solar cells.
abstract: We report the use of three solution processable azadipyrromethene (ADPM) based compounds, i.e., ADPM, B,F(2)-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 × 10(5) 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 C(60) 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 (V(oc)) of ~0.8 V was achieved for the BO-ADPM/C(60) device, which is among the highest reported values for organic solar cells with photocurrent generation in the near-infrared region beyond 1.5 eV.
authors: The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
authors: Sibel Y
authors: SY
authors: Leblebici
authors: Luis
authors: L
authors: Catane
authors: David E
authors: DE
authors: Barclay
authors: Tara
authors: T
authors: Olson
authors: Teresa L
authors: TL
authors: Chen
authors: Biwu
authors: B
authors: Ma