非富勒烯聚合物薄膜的超快可见激发-红外探测光谱研究

Ultrafast Visible Pump-Infrared Probe Spectroscopy of Non-Fullerenes Polymer Thin Film

非富勒烯聚合物太阳能电池材料是最具前景的有机太阳能电池材料之一。供受体材料的化学结构直接决定两者之间能带匹配程度,从而影响光电转换效率。本文以非富勒烯给受体材料为研究对象,利用超快可见激发-中红外探测光谱方法,以ITIC分子中的CN和CO伸缩振动为探针,研究了非富勒烯聚合物薄膜在光激发后电荷分离及演化过程。结果表明,这一体系的电荷分离过程可发生在皮秒时间尺度上。

Non-fullerene polymeric material is one of the most promising organic solar cell materials.The chemical structure of donor and acceptor materials determines the energy band matching degree of active layer,thus affecting the photoelectric conversion efficiency.In this work,we employ ultrafast visible pump and infrared probespectroscopy to study such organic polymer materials.Charge separation process of the polymer solar cells after optical excitation was mentioned by using CN and CO stretchingvibrational modes of ITIC,such process was formed to occur on the as time scales.