Lee Sang Kyu, Lee Jaemin, Lee Hae Young, Yoon Sung Cheol, Kim Jae Ryoung, Kim Kyu Nam, Kim Hee Joo, Shin Won Suk, Moon Sang-Jin
Advanced Materials Division, Korea Research Institute of Chemical Technology, Sinseongno 19, Yuseong, Daejeon 305-600, Korea.
J Nanosci Nanotechnol. 2011 May;11(5):4279-84. doi: 10.1166/jnn.2011.3699.
A series of dithienosilole-based copolymers, poly [(4,4'-bis(2-hexyl)dithieno[3,2-b:2',3'-d]silole)-2,6-diyl-alt-(2,1,3-benzothiadiazole)-5,5'-diyl] (P1), poly[(4,4'-bis(2-hexyl)dithieno[3,2-b:2',3'-d]silole)-2,6-diyl-alt-(2,2'-bithiazole)-5,5'-diyl] (P2), poly(4,4'-bis(2-hexyl)dithieno[3,2-b:2',3'-d]silole)-2, 6-diyl-alt-(10 -methyl-phenothiazine)-3,7-diyl, poly[(4,4'-bis(2-hexyl)dithieno[3,2-b:2',3'-d]silole)-2,6-diyl-alt-(4,7-bis(2-thienyl)-9,10-anthracene)-5,5'-diyl] (P4) were synthesized by the Pd-catalyzed Stille polymerization method. Electron-deficient benzothiadiazole and bithiazole units and electron-rich phenothiazine and anthracene moieties were incorporated into the polymer backbone to obtain the broad absorption spectrum and to improve the hole-transporting characteristics, respectively. The polymer solar cell (PSC) was fabricated with a layered structure of ITO/PEDOT:PSS/polymer:C71-PCBM (1:3)/LiF/Al. The best performance of PSC was obtained at P3:C71-PCBM which reaches a power conversion efficiency (PCE) of 1.18%, with a short circuit current density (J(sc)) of 4.75 mA/cm2, an open circuit voltage (V(oc)) of 0.71 V, and a fill factor (FF) of 0.35 under AM 1.5G irradiation (100 mW/cm2).
通过钯催化的Stille聚合方法合成了一系列基于二噻吩并硅杂环戊二烯的共聚物，聚(4,4'-双(2-己基)二噻吩并[3,2-b:2',3'-d]硅杂环戊二烯)-2,6-二亚基-alt-(2,1,3-苯并噻二唑)-5,5'-二亚基、聚(4,4'-双(2-己基)二噻吩并[3,2-b:2',3'-d]硅杂环戊二烯)-2,6-二亚基-alt-(2,2'-联噻唑)-5,5'-二亚基、聚(4,4'-双(2-己基)二噻吩并[3,2-b:2',3'-d]硅杂环戊二烯)-2,6-二亚基-alt-(10-甲基-吩噻嗪)-3,7-二亚基、聚(4,4'-双(2-己基)二噻吩并[3,2-b:2',3'-d]硅杂环戊二烯)-2,6-二亚基-alt-(4,7-双(2-噻吩基)-9,10-蒽)-5,5'-二亚基。缺电子的苯并噻二唑和联噻唑单元以及富电子的吩噻嗪和蒽部分分别被引入到聚合物主链中，以获得宽吸收光谱并改善空穴传输特性。聚合物太阳能电池(PSC)采用ITO/PEDOT:PSS/聚合物:C71-PCBM(1:3)/LiF/Al的层状结构制备。PSC在P3:C71-PCBM时表现出最佳性能，在AM 1.5G光照(100 mW/cm2)下，功率转换效率(PCE)达到1.18%，短路电流密度(J(sc))为4.75 mA/cm2，开路电压(V(oc))为0.71 V，填充因子(FF)为0.35。
