对可见光有良好吸收的新型烷基芴共聚物的合成、表征与性质

以芴为起始原料, 合成了两种主链含有芴酮及二腈基亚甲基芴结构单元的聚烷基芴光伏材料, 通过红外光谱和核磁共振谱对其进行了表征. 目标共聚物P1和P2的热分解温度分别为461.2和448.1 ℃, 玻璃化转变温度(Tg)分别为122.4和146.6 ℃, 具有良好的热稳定性. 在300~700 nm范围内, 该种材料对太阳光的吸收基本覆盖了整个可见光区域, 电化学分析得出其具有较好的氧化还原可逆性, 并且具有1.94和1.86 eV的相对较窄的能带宽度.

Synthesis,Characterization and Properties of Novel Polyfluorene Copolymers with Good Visible Spectral Coverage

Conjugated polymers are increasingly concernful as the emerging semiconductors due to their low cost, ease of processing, flexibility and excellent optic-electro properties. In this paper, two novel polymeric photovoltaic materials on the basis of fluorene having fluoren-9-one and fluoren-9-units in the main chain were synthesized. The polymers were characterized via FTIR and NMR. The polymers possess a satisfactory thermal stability and machinability with thermal decomposition temperature(Td) of 461.2 and 448.1 ℃ and glass-transition temperature(Tg) of 122.4 and 146.6 ℃, respectively. The materials perform a good absorption around about 300—700 nm covering a large part of the visible spectrum. Their effective reversibilities of redox reaction were determined, and the polymers exhibited a correspondingly low bandgap of 1.94 and 1.86 eV detected by cyclic voltammetry(CV). Therefore, these polymers will be potential light-absorbing and electro-transport materials applied in organic photovoltaic devices.