Synthesis of two benzo[1,2-b:3,4-b′]dithiophene-based conjugated polymers with different side chains and their applications in photovoltaic devices

Add time:09/28/2019    Source:infona.pl

Two D–A conjugated polymers (named PBDTC 6 DBT and PBDTC 10 DBT) with benzo[1,2-b:3,4-b′]dithiophene (BDT) as donor and 4,7-dithiophen-2,1,3-benzothiadiazole (DBT) as acceptor, were designed and synthesized. PBDTC 6 DBT and PBDTC 10 DBT have hexyl and decyl as side chains in the DBT units, respectively. The polymers were characterized by spectroscopic (NMR and UV–vis) methods, GPC, DSC and cyclic voltammetry. In order to study the photovoltaic properties of the two conjugated polymers, photovoltaic devices with the configuration of ITO/poly(3,4-ethylenedioxythiophene)–poly(styrenesulfonate) (PEDOT:PSS)/polymer:[6,6]-phenyl C 61 -butyric acid methyl ester (PC 61 BM)/LiF/Al, were fabricated, in which PBDTC 6 DBT or PBDTC 10 DBT acted as electron donor in active layers. According to the experimental data, when the blend ratio of PBDTC 6 DBT and PC 61 BM reached 1:2, the best photovoltaic properties among the PBDTC 6 DBT-based devices were obtained, and the open-circuit voltage, the short-circuit current density and the power conversion efficiency were measured to be 0.63V, 6.18mA/cm 2 and 1.86%, respectively. As to PBDTC 10 DBT-based devices, the maximum of power conversion efficiency reached 0.99% with the blend ratio of PBDTC 10 DBT and PC 61 BM being 1:2. PBDTC 10 DBT and PBDTC 6 DBT were both promising donor candidates in the application of polymer solar cells.

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