높은 개방전압의 유기태양전지를 위한 2,7-Dibenzosilole 기반 전도성 고분자의 합성과 특성

Abstract

학위논문 (석사)-- 서울대학교 대학원 : 재료공학부(하이브리드 재료), 2014. 2. 조원호.We synthesized a donor-acceptor (D–A) type conjugated polymer for organic solar cells composed of 2,7-dibenzosilole (DBS) as an electron-rich unit and benzo[c][1,2,5]oxadiazole (BO) as an electron-deficient unit by Suzuki coupling. We also synthesized dithienosilole based D–A type alternating copolymer, PDTSDTBO as reference. The HOMO energy levels of PDBSDTBO and PDTSDTBO were -5.52 eV and -5.23 eV, respectively.The solar cell device fabricated by blending with PDBSDTBO and PC71BM as the active layer has higher VOC than that of the PDTSDTBO-based device, mainly due to the deeper HOMO energy level. The device fabricated with PDBSDTBO and PC71BM exhibits a power conversion efficiency (PCE) of 2.34%, which is higher than that of PDTSDTBO-based device.Abstract---ⅰ List of Schemes---ⅳ List of Figures---ⅴ List of Tables---ⅶ Chapter 1. Introduction ---1 Chapter 2. Experimental Section---5 2.1 Materials---5 2.2 Synthesis of monomers---5 2.3 Synthesis of polymer---16 2.4 Characterization---19 2.5 Device fabrication and measurements ---19 Chapter 3. Results and Discussion ---23 3.1 Synthesis and Characterization---23 3.2 Optical properties---33 3.3 Electrochemical properties---33 3.4 Photovoltaic properties---38 3.5 Morphology investigation---39 3.6 Charge transport characterics---40 Chapter 4. Conclusions---46 Bibliography---47 Korean Abstract---51Maste