Photogenerated Intrinsic Free Carriers in Small-molecule Organic Semiconductors Visualized by Ultrafast Spectroscopy

	Photogenerated Intrinsic Free Carriers in Small-molecule Organic Semiconductors Visualized by Ultrafast Spectroscopy
	He, Xiaochuan 1; Zhu, Gangbei 1; Yang, Jianbing 2; Chang, Hao 2; Meng, Qingyu 3; Zhao, Hongwu 3; Zhou, Xin 4; Yue, Shuai 1; Wang, Zhuan 1; Shi, Jinan 5
刊名	SCIENTIFIC REPORTS
	2015-11-27
卷号	5
英文摘要	Confirmation of direct photogeneration of intrinsic delocalized free carriers in small-molecule organic semiconductors has been a long-sought but unsolved issue, which is of fundamental significance to its application in photo-electric devices. Although the excitonic description of photoexcitation in these materials has been widely accepted, this concept is challenged by recently reported phenomena. Here we report observation of direct delocalized free carrier generation upon interband photoexcitation in highly crystalline zinc phthalocyanine films prepared by the weak epitaxy growth method using ultrafast spectroscopy. Transient absorption spectra spanning the visible to mid-infrared region revealed the existence of short-lived free electrons and holes with a diffusion length estimated to cross at least 11 molecules along the pi-pi stacking direction that subsequently localize to form charge transfer excitons. The interband transition was evidenced by ultraviolet-visible absorption, photoluminescence and electroluminescence spectroscopy. Our results suggest that delocalized free carriers photogeneration can also be achieved in organic semiconductors when the molecules are packed properly.
收录类别	SCI
语种	英语
公开日期	2016-01-12
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/29361]
专题	化学研究所_高技术材料实验室
作者单位	1.Chinese Acad Sci, Inst Phys, Lab Soft Matter Phys, Beijing 100190, Peoples R China 2.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China 3.Chinese Acad Sci, Inst Phys, Lab Solid State Quantum Informat & Quantum Comput, Beijing 100190, Peoples R China 4.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalys, Dalian 116023, Peoples R China 5.Chinese Acad Sci, Inst Phys, Lab Adv Mat & Elect Microscopy, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	He, Xiaochuan,Zhu, Gangbei,Yang, Jianbing,et al. Photogenerated Intrinsic Free Carriers in Small-molecule Organic Semiconductors Visualized by Ultrafast Spectroscopy[J]. SCIENTIFIC REPORTS,2015,5.
APA	He, Xiaochuan.,Zhu, Gangbei.,Yang, Jianbing.,Chang, Hao.,Meng, Qingyu.,...&Weng, Yuxiang.(2015).Photogenerated Intrinsic Free Carriers in Small-molecule Organic Semiconductors Visualized by Ultrafast Spectroscopy.SCIENTIFIC REPORTS,5.
MLA	He, Xiaochuan,et al."Photogenerated Intrinsic Free Carriers in Small-molecule Organic Semiconductors Visualized by Ultrafast Spectroscopy".SCIENTIFIC REPORTS 5(2015).