Organic-inorganic heterostructure materials have received significant research interest for designing light harvesting devices because of their efficient charge separation. Here, we design organic and inorganic nano-heterostructures using conjugated polymer nanoparticles (PNPs) [poly(3-hexylthiophene-2,5-diyl), P3HT] and Au nanoparticles. We investigate the carrier relaxation processes of this heterostructure at different time scales by ultrafast transient absorption spectroscopy. The lifetime of the singlet state (S1) of the pristine polymer shortens from 480.7 ps to 2.8 ps due to the formation of nanoparticles, and the formation of a delocalized collective state (CLS) is obtained in polymer nanoparticles whose lifetime is found to be 384.6 ps. The hot and ultrafast electron transfers occur from P3HT polymer nanoparticles to Au nanoparticles and the time constants are 253 fs and 37.7 ps, respectively, which are responsible for the efficient charge separation in such heterostructures. Such a fundamental study of relaxation processes of organic-inorganic nano heterostructures is very significant for designing light harvesting systems.

中文翻译：

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P3HT聚合物纳米粒子塌陷状态的弛豫过程的全局和目标分析。

有机-无机异质结构材料因其有效的电荷分离而在设计光收集装置方面受到了广泛的研究兴趣。在这里，我们设计使用共轭聚合物纳米粒子（PNPs）[聚（3-己基噻吩-2,5-二基），P3HT]和金纳米粒子的有机和无机纳米异质结构。我们通过超快速瞬态吸收光谱研究了在不同时间尺度上这种异质结构的载流子弛豫过程。原始聚合物的单重态（S1）的寿命由于纳米颗粒的形成而从480.7 ps缩短至2.8 ps，并且在发现寿命为384.6的聚合物纳米颗粒中获得了离域集体态（CLS）的形成ps。电子从P3HT聚合物纳米颗粒向Au纳米颗粒发生热和超快电子转移，时间常数分别为253 fs和37.7 ps，这是在此类异质结构中进行有效电荷分离的原因。这种有机-无机纳米异质结构弛豫过程的基础研究对于设计光收集系统非常重要。