Table 1 Absorption and electrochemical properties of sensitizers WS-37, WS-38 and WS-51 and reference dye WS-2.

From: Rational molecular engineering of cyclopentadithiophene-bridged D-A-π-A sensitizers combining high photovoltaic efficiency with rapid dye adsorption

Dye

λmax [nm]a

ε [M−1 cm−1]a

λmaxon TiO2 [nm]b

HOMO [V]c

E0-0 [eV]d

LUMO [V]d

WS-2

533

16700

515

0.90

1.90

–1.00

 

395

14100

    
 

321

21100

    

WS-37

536

37300

514

1.05

1.96

–0.91

 

457

16700

    
 

308

20900

    

WS-38

546

41000

529

0.85

1.89

–1.04

 

459

17200

    
 

308

22700

    

WS-51

551

43000

533

0.82

1.83

–1.01

 

460

27800

    
 

314

22700

    
  1. aAbsorption peaks (λmax) and molar extinction coefficients (ε) in mixed solution (CHCl3:CH3OH, v/v = 4:1).
  2. bAbsorption peaks on TiO2 films.
  3. cHOMO were measured in CH2Cl2 with 0.1 M tetrabutylammonium hexafluorophosphate (TBAPF6) as electrolyte (working electrode: Pt; reference electrode: SCE; calibrated with ferrocene/ferrocenium (Fc/Fc+) as an external reference. Counter electrode: Pt and the scan rate is 100 mV/s.
  4. dE0-0 was estimated from the absorption thresholds from absorption spectra of dyes adsorbed on the TiO2 film, LUMO is estimated by subtracting E0-0 from the HOMO.
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