Synthesis and photovoltaic properties of ester group functionalized polythiophene derivatives.
Synthesis and photovoltaic properties of ester group functionalized polythiophene derivatives.
复制标题
DOI：
10.1002/marc.201000711
复制
发表时间：
2011-03
影响因子：
4.6
通讯作者：
Xiao-lian Hu;M. Shi;Jian Chen;Lijian Zuo;Lei Fu;Yujing Liu;Hongzheng Chen
中科院分区：
文献类型：
--
作者：
Xiao-lian Hu;M. Shi;Jian Chen;Lijian Zuo;Lei Fu;Yujing Liu;Hongzheng Chen
为了提高聚噻吩聚合物太阳能电池（PSCs）的开路电压（V(OC)），设计并合成了两种新的酯基功能化聚噻吩衍生物PCTDT和PCTBDT，它们分别由噻吩-3-羧酸酯（CT）与2,2′-噻吩（DT）和苯二噻吩（BDT）单元交替共聚而成。所得共聚物在可见光区具有广泛而强的吸收，与常用的聚（3-己基噻吩）（P3HT）相似。通过循环伏安法测量发现，两种共聚物的HOMO能级（PCTDT为-5.27 eV， PCTBDT为-5.36 eV）均低于P3HT (-5.03 eV)，表明通过在聚合物侧链中引入酯基可以有效降低HOMO能级。研究了以[6,6]-苯基- c(61)-丁酸甲酯（PCBM）为电子受体共混共聚物的光伏性能。与P3HT:PCBM共混材料相比，得到的两种器件均具有较大的短路电流（I(SC)）和较高的电压（OC）。PCTBDT:PCBM共混体系的功率转换效率（PCE）可达2.32%，I（SC）为6.94 mA·cm(-2)，电压（OC）为0.80 V； PCTDT:PCBM共混体系的功率转换效率（PCE）为1.75%，电压（OC）为0.68 V。
To increase the open circuit voltage (V(OC)) of polymer solar cells (PSCs) based on polythiophene, two new ester group functionalized polythiophene derivatives, PCTDT and PCTBDT, were designed and synthesized via alternating copolymerization of thiophene-3-carboxylate (CT) with the 2,2'-bithiophene (DT) and benzodithiophene (BDT) units, respectively. The resulting copolymers exhibited broad and strong absorptions in the visible region, which was similar to that of the commonly used poly(3-hexylthiophene) (P3HT). Through cyclic voltammetry measurements, it was found that both copolymers showed lower HOMO energy levels (-5.27 eV for PCTDT and -5.36 eV for PCTBDT) than that of P3HT (-5.03 eV), indicating that the HOMO energy level could be efficiently reduced by introducing the ester group into the polymer side chain. Photovoltaic properties of the copolymers blended with [6,6]-phenyl-C(61)-butyric acid methyl ester (PCBM) as electron acceptor were investigated. The obtained two devices possessed both relatively large short circuit current (I(SC)) and higher V(OC) than that of P3HT:PCBM blend. For PCTBDT:PCBM blend, a power conversion efficiency (PCE) up to 2.32%, an I(SC) of 6.94 mA · cm(-2), and a V(OC) of 0.80 V were observed while PCTDT:PCBM system demonstrated a PCE of 1.75% with a V(OC) of 0.68 V.