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Photogenerated Intrinsic Free Carriers in Small-molecule Organic Semiconductors Visualized by Ultrafast Spectroscopy
He, Xiaochuan1; Zhu, Gangbei1; Yang, Jianbing2; Chang, Hao2; Meng, Qingyu3; Zhao, Hongwu3; Zhou, Xin4; Yue, Shuai1; Wang, Zhuan1; Shi, Jinan5; Gu, Lin5; Yan, Donghang2; Weng, Yuxiang1
Source PublicationSCIENTIFIC REPORTS
2015-11-27
ISSN2045-2322
DOI10.1038/srep17076
Volume5
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology
WOS SubjectMultidisciplinary Sciences
WOS Research AreaScience & Technology - Other Topics
WOS KeywordFIELD-EFFECT TRANSISTORS ; CHARGE-TRANSPORT ; THIN-FILMS ; POLYMERIC SEMICONDUCTORS ; ABSORPTION-SPECTROSCOPY ; INFRARED-ABSORPTION ; SOLAR-CELLS ; PHOTOLUMINESCENCE ; SPECTRA ; STATE
AbstractConfirmation 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.
Language英语
WOS IDWOS:000365397000003
PublisherNATURE PUBLISHING GROUP
Citation statistics
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/171591
Collection中国科学院大连化学物理研究所
Corresponding AuthorWeng, Yuxiang
Affiliation1.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
Recommended Citation
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).
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