Molecular-level architectural design using benzothiadiazole-based polymers for photovoltaic applications

Vinila N. Viswanathan,
Arun D. Rao,
Upendra K. Pandey,
Arul Varman Kesavan and
Praveen C. Ramamurthy

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Published 10 May 2017

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1. Graphical Abstract
2. Scheme 1: Synthetic route towards monomers M1, M2 and M3.
  
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3. Scheme 2: Synthesis of polymers P1, P2, and P3.
  
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4. Figure 1: Isodensity surface plots of frontier molecular orbitals and optimized molecular geometries of P1, P2...
  
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5. Figure 2: Theoretical absorption spectra of the polymers P1–P3 calculated using TDDFT.
  
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6. Figure 3: Electrochemical spectra of polymers P1–P3.
  
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7. Figure 4: Normalized absorption spectra of the polymers in solution, film and annealed film (130 °C) forms.
  
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8. Figure 5: Photoluminescence spectra of polymers P1–P3 and polymer:PC₇₀BM blends.
  
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9. Figure 6: Bulk heterojunction solar cells device architecture, illustrating favorable conditions for absorpti...
  
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10. Figure 7: J–V Spectra in chlorobenzene (CB) for which the ratio of polymer:PC₇₀BM was optimized as follows: P1...
  
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11. Figure 8: External quantum efficiency spectra of optimized devices fabricated with polymers P1, P2 and P3 and...
  
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Beilstein J. Org. Chem. 2017, 13, 863–873, doi:10.3762/bjoc.13.87

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Solution processable diketopyrrolopyrrole (DPP) cored small molecules with BODIPY end groups as novel donors for organic solar cells

Diego Cortizo-Lacalle,
Calvyn T. Howells,
Upendra K. Pandey,
Joseph Cameron,
Neil J. Findlay,
Anto Regis Inigo,
Tell Tuttle,
Peter J. Skabara and
Ifor D. W. Samuel

Full Research Paper
Published 18 Nov 2014

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1. Graphical Abstract
2. Figure 1: Chemical structures of DPP core 1 and BODIPY core 2.
  
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3. Scheme 1: Synthesis of triads 9 and 10. Reagents and conditions: (i) phosphoryl chloride, N,N-dimethylformami...
  
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4. Figure 2: Cyclic voltammetry of 9 (black) and 10 (red) in solution (left) and thin-film (right). The experime...
  
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5. Figure 3: Normalised UV–vis absorption spectra of 9 (black), 10 (red) and DPP core (11, green) in dichloromet...
  
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6. Figure 4: Structure of the dithieno-DPP (11) core.
  
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7. Figure 5: BOD-T4 structure reported by Harriman et al. [50].
  
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8. Figure 6: Electrostatic potential charges for each unit in compounds 9 and 10: radical anion (blue), neutral ...
  
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9. Figure 7: Electrostatic potential charges for each unit in (2Th)₂DPP and (3Th)₂DPP radical anion (blue), neut...
  
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10. Figure 8: Frontier orbitals for radical anion SOMO (top), neutral HOMO (bottom) of 9 (left) and 10 (right).
  
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11. Figure 9: Incident photon to converted electron (IPCE) ratio or external quantum efficiency (EQE) for 9:PC₇₁B...
  
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12. Figure 10: J–V for 9:PC₇₁BM (1:3) and 10:PC₇₁BM (1:3) in the dark.
  
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13. Figure 11: J–V for 9:PC₇₁BM (1:3) and 10:PC₇₁BM (1:3) under illumination at 100 mW cm⁻² with an AM1.5 G source....
  
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14. Figure 12: Tapping mode AFM height images for 9:PC₇₁BM (1:3) (left) and 10:PC₇₁BM (1:3) (right) on fused silic...
  
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