Lee Sun-Young, Jung Choong-Hwa, Kang Jun, Kim Hee-Joon, Shin Won Suk, Yoon Sung Cheol, Moon Sang-Jin, Lee Changjin, Hwang Do-Hoon
Department of Chemistry, and Chemistry Institute for Functional Materials, Pusan National University, Busan 609-735, Republic of Korea.
J Nanosci Nanotechnol. 2011 May;11(5):4367-72. doi: 10.1166/jnn.2011.3710.
An alternating conjugated copolymer composed of pyrene and bithiophene units, poly(DHBT-alt-PYR) has been synthesized. The synthesized polymer was found to exhibit good solution processibility and thermal stability, losing less than 5% of their weight on heating to approximately 370 degrees C. The synthesized polymer showed its maximum absorption and peak PL emission at 401 and 548 nm, respectively. The optical band gap energy of the polymer was determined by absorption onset to be 2.64 eV. Highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels of the polymer was determined to be -5.48 and -2.84 eV by cyclic voltametry (CV) and the optical band gap. The polymer photovoltaic devices were fabricated with a typical sandwich structure of ITO/PEDOT:PSS/active layer/LiF/Al using poly(DHBT-alt-PYR) as an electron donor and C60-PCBM or C70-PCBM as electron acceptors. The open circuit voltage, short circuit current and fill factor of the device using C70-PCBM as an acceptor were 0.75 V, 3.80 mA/cm2 and 0.28, respectively, and the maximum power conversion efficiency of the device was 0.80%.
由芘和联噻吩单元组成的交替共轭共聚物聚（DHBT-alt-PYR）已被合成。发现合成的聚合物具有良好的溶液加工性能和热稳定性，在加热到约370℃时重量损失小于5%。合成的聚合物分别在401和548nm处显示出最大吸收和峰值PL发射。通过吸收起始点确定该聚合物的光学带隙能量为2.64eV。通过循环伏安法（CV）和光学带隙确定该聚合物的最高占据分子轨道（HOMO）和最低未占据分子轨道（LUMO）能级分别为-5.48和-2.84eV。使用聚（DHBT-alt-PYR）作为电子供体，C60-PCBM或C70-PCBM作为电子受体，采用ITO/PEDOT:PSS/活性层/LiF/Al的典型三明治结构制备聚合物光伏器件。以C70-PCBM作为受体的器件的开路电压、短路电流和填充因子分别为0.75V、3.80mA/cm2和0.28，该器件的最大功率转换效率为0.80%。
