基于手性聚噻吩嵌段共聚物的圆偏振光探测器

Circularly polarized photodetector based on chiral polythiophene block copolymer

手性有机半导体由于具有光谱可调和易于加工的优点,在小型化和集成化的圆偏振光检测中具有广泛的应用前景。本文通过控制手性异腈(PPI)的加入合成了聚(3-己基噻吩-嵌段-聚(苯基异氰))(P3HT80和P3HT80-PPI(L)30)。实验结果证明了两种半导体聚合物被成功合成。测试了两种半导体聚合物的光学特性,发现嵌段聚合物P3HT80-PPI(L)30具有手性光学活性。制备了基于有机场效应晶体管的圆偏振光探测器,研究器件对于450 nm的圆偏振光旋向的区分性能。实验结果表明,手性异腈(PPI)的加入虽然降低了P3HT80的电学性能,但引入了手性光学活性,使基于P3HT80-PPI(L)30制备的器件能够区分圆偏振光的旋向,并且在450 nm的光电流不对称因子gres达到了0.083。

Chiral organic semiconductors are promising for miniaturized and integrated circularly polarized light detection due to their spectral tunability and easy processing.In this paper,poly(3-hexylthiopheneblock-poly(phenylisocyanide))(P3HT80 and P3HT80-PPI(L)30)were synthesized by controlled incorporation of chiral isonitrile(PPI).The experimental results demonstrated that two semiconductor polymers were successfully synthesized.Furthermore,the optical properties of the two semiconductor polymers were tested and the block polymer P3HT80-PPI(L)30 was found to have chiral optical activity.A circularly polarized photodetector based on an organic field effect transistor was prepared to study the performance of the device for differentiating the spin direction of circularly polarized light at 450 nm.The experimental results indicated that the addition of chiral isonitrile(PPI)degraded the electrical properties of P3HT80 but introduced chiral optical activity,enabling the devices based on P3HT80-PPI(L)30 to distinguish the spin direction of circularly polarized light,and the photocurrent asymmetry factor gres at 450 nm reached 0.083.