Synthesis and Characterizations of Carbazole Benzothiadiazole-Containing Derivatives for Organic Solar Cell Applications
Date Issued
2011
Date
2011
Author(s)
Shih, Siao-Cheng
Abstract
In this study, we synthesized three type monomers : carbazole-containing、thiophene-containing、benzothiadiazole-containing. Carbazole was a great hole transporting material in OLED and OPV field. We expected that increasing of polymer solubility which was modified by n-Hexane on carbazole nitrogen site. We also used the Styrene (Para site) to connected with monomer via suzuki coupling reactions. All kind of polymers were synthesized via free radical polymerization. The homopolymers P1~P3 and the copolymers P4~P6 were successfully synthesized. All derivatives discovered good thermal stability, and 5% thermal degradation temperature over 350 oC. The optical properties showed that the absorption were red-shifted with the film state on absorption spectrum, It was indicated that copolymers P4~P6 had great interaction of π-πstacking molecular structure. The optical band gap of P4, P5 and P6 were 2.18 eV, 2.15 eV, 2.12 eV respectively. We also observed that the HOMO of these derivatives increased with increasing raio of carbazole unit. The preliminary bulk heterojunction solar cell devices were fabricated with poymer P1~P6. The highest power conversion efficiency were 0.22 %, containing weigh ratio with P6 : PCBM = 1:4 , VOC of 0.45 (V), ISC of 1.49 mA/cm2, and FF of 0.32 under AM 1.5G solar simulator.
Subjects
carbazole
thiophene
benzothiadiazole
bulk heterojunction solar cell
Type
thesis
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