Manipulating Backbone Structure to Enhance Low Band Gap Polymer Photovoltaic Performance

doi:10.1002/aenm.201300031

CORC > 化学研究所 > 中国科学院化学研究所

	Manipulating Backbone Structure to Enhance Low Band Gap Polymer Photovoltaic Performance
	Huang, Ye 1; Liu, Feng 2; Guo, Xia 1; Zhang, Wei 3; Gu, Yu 2; Zhang, Jianping 3; Han, Charles C.1; Russell, Thomas P.2; Hou, Jianhui 1
刊名	ADVANCED ENERGY MATERIALS
	2013-07-01
卷号	3 期号:7 页码:930-937
关键词	Low Bandgap Polymers Polymer Solar Cells Absorption Coefficient Transient Absorption
ISSN号	1614-6832
DOI	10.1002/aenm.201300031
英文摘要	A pair of polymers, PBDTBT and PBDTDTBT, was synthesized for application in polymer solar cells (PSCs). Although these two polymers have similar absorption bands and molecular energy levels, PBDTDTBT exhibits much better photovoltaic performance in polymer solar cell (PSC) devices with power conversion efficiency (PCE) of 7.4%. To understand the differences between PBDTDTBT and PBDTBT, we have investigated the correlations of the molecular structure, morphology, dynamics and efficiency of these two polymers. A theoretical investigation using density functional theory (DFT) and time-dependent DFT (TDDFT) has been employed to investigate the electron density and electron delocalization extent of the unimers. TEM data showed that PBDTDTBT phase separates from PC71BM, while PBDTBT suffers from having a proper morphology on different processing conditions. Grazing incidence wide angle X-ray diffraction (GIWAXD) was used to probe the crystal structure of the polymers in thin film. A polymorph crystal structure was observed for PBDTBT. Grazing incidence small angle X-ray scattering (GISAXS) was used to probe the size scale of phase separation, with an optimized 25 nm feature size observed for PBDTDTBT/PC71BM blends, which agrees well with TEM results. Femtosecond transient absorption (TA) spectroscopy was used to probe the dynamics of the fundamental processes in organic photovoltaic (OPV) materials, such as charge separation and recombination. The enhanced absorption coefficient, good charge separation, optimal phase separation and higher charge mobility all contribute to the high PCE of the PBDTDTBT/PC71BM devices.
语种	英语
出版者	WILEY-V C H VERLAG GMBH
WOS记录号	WOS:000327698200016
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/53881]
专题	中国科学院化学研究所
通讯作者	Zhang, Jianping
作者单位	1.Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, Key Lab Polymer Phys & Chem, Beijing 100190, Peoples R China 2.Univ Massachusetts, Dept Polymer Sci & Engn, Amherst, MA 01003 USA 3.Renmin Univ China, Dept Chem, Beijing 100872, Peoples R China
推荐引用方式 GB/T 7714	Huang, Ye,Liu, Feng,Guo, Xia,et al. Manipulating Backbone Structure to Enhance Low Band Gap Polymer Photovoltaic Performance[J]. ADVANCED ENERGY MATERIALS,2013,3(7):930-937.
APA	Huang, Ye.,Liu, Feng.,Guo, Xia.,Zhang, Wei.,Gu, Yu.,...&Hou, Jianhui.(2013).Manipulating Backbone Structure to Enhance Low Band Gap Polymer Photovoltaic Performance.ADVANCED ENERGY MATERIALS,3(7),930-937.
MLA	Huang, Ye,et al."Manipulating Backbone Structure to Enhance Low Band Gap Polymer Photovoltaic Performance".ADVANCED ENERGY MATERIALS 3.7(2013):930-937.