International Journal of Photoenergy

Research Article

Synthesis and Characterization of Carbazole-Benzothiadiazole-Based Conjugated Polymers for Organic Photovoltaic Cells with Triazole in the Main Chain

Table 1

Physical properties of polymers.


	PCz3TB	PCz3TBTz-1	PCz3TBTz-2	PCz3TBTz-3

Ratio (Cz : 3TB : Tz)
Feed ratio	50 : 50 : 0	50 : 40 : 10	50 : 25 : 25	50 : 10 : 40
Actual ratio^a	61 : 39 : 0	62 : 35 : 3	60 : 24 : 16	56 : 10 : 34
	94800	95300	77400	8300
	121700	135100	110200	11700
PDI (/)	1.28	1.42	1.42	1.41
(°C)	361	359	354	369
Solution (, nm) Abs.	380, 530	380, 536	380, 536	365, 528
Film (, nm) Abs.	390, 560	392, 566	383, 550	356, 539
(V versus SCE)^c	0.98	0.96	0.99	0.92
HOMO (eV)^d	–5.37	–5.35	–5.38	–5.31
LUMO (eV)	–3.51	–3.49	–3.48	–3.36
(eV)^e	1.86	1.86	1.90	1.95

Actual ratio in polymers determined by elemental analysis.
and stand for the number-average and weight-average molecular weights, respectively, determined by GPC.
stands for onset potential of oxidation.
Calculated using the empirical equation: .
Optical band gaps () taken as the absorption onsets in the UV-vis spectra of the polymer films (/ eV).