Synthesis of new carbazole substituted fullerene derivative as an electron acceptor for bulk heterojunction organic photovoltaic cell applications

Chemistry Division, School of Advanced Sciences, VIT University, Vellore-632 014, Tamilnadu, India

E-mail : sakthivel.p@vit.ac.in

Electrochemical Materials Science (ECMS) Division, Central Electrochemical Research Institute,

Karaikudi-630 006, Tamilnadu, India

Department of Chemistry Education, Pusan National University, Busan 609-735, Korea

We design and synthesized 9-hexyl carbazole-3-C₆₁-butric acid methyl ester, (HCvz-C₆₁BM) carbazole based fullerene acceptor derivative used for photovoltaic cell applications. The synthesized HCvz-C₆₁BM acceptor freely soluble in common organic solvents such as CHCl₃ , CH₂Cl₂ , THF, ODCB and it showed higher LUMO of –3.63 eV. The HCvz-C₆₁BM acceptor showed higher thermal stability of 413 ºC. The organic photovoltaic device was fabricated with the configuration of ITO/PEDOT/P3HT : HCvz-C₆₁BM/LiF/Al. It shows the best performance for 1 : 2 weight ratio of P3HT : HCvz-C₆₁BM with PCE of 1.74%, Jsc of 6.19 mA/cm² , Voc of 0.78 V and FF of 37%.