Application of Biuret, Dicyandiamide, or Urea as a Cathode Buffer Layer toward the Efficiency Enhancement of Polymer Solar Cells

CORC > 苏州纳米技术与纳米仿生研究所 > 中国科学院苏州纳米技术与纳米仿生研究所 > 纳米研究国际实验室 > 陈立桅团队

	Application of Biuret, Dicyandiamide, or Urea as a Cathode Buffer Layer toward the Efficiency Enhancement of Polymer Solar Cells
	Chen, LW (陈立桅)
刊名	ACS APPLIED MATERIALS & INTERFACES
	2014
卷号	6 期号:6 页码:4329-4337
关键词	polymer solar cells biuret dicyandiamide urea amino group cathode buffer layer
通讯作者	Yang, SF (Yang, Shangfeng)
英文摘要	Three amino-containing small-molecule organic materials-biuret, dicyandiamide (DCDA), and urea were successfully applied as novel cathode buffer layers (CBLs) in P3HT:PCBM bulk heterojunction polymer solar cells (BHJ-PSCs) for the first time, resulting in obvious efficiency enhancement. Under the optimized condition, the power conversion efficiencies (PCEs) of the CBL-incorporated BHJ-PSC devices are 3.84%, 4.25%, and 4.39% for biuret, DCDA, and urea, which are enhanced by similar to 15%, similar to 27%, and similar to 31%, respectively, compared to the reference poly(3-hexylthiophene-2,5-diyl) : [6,6]-phenyl-C-61-butyric acid methyl ester (P3HT:PCBM) BHJ-PSC device without any CBL. The efficiency enhancement is primarily attributed to the increases of both short-circuit current density (J(sc)) and fill factor (FF), for which the enhancement ratio is found to be sensitively dependent on the molecular structure of small-molecule organic materials. The surface morphologies and surface potential changes of the CBL-incorporated P3HT:PCBM photoactive layers were studied by atomic force microscopy and scanning Kelvin probe microscopy, respectively, suggesting the formation of an interfacial dipole layer between the photoactive layer and Al cathode, which may decrease the energy level offset between the work function of Al and the lowest unoccipoed molecular orbital level (LUMO) of the PCBM acceptor and consequently facilitate electron extraction by the Al cathode. The difference in the enhancement effect of biuret, DCDA, and urea is due to their difference on the work function matching with P3HT:PCBM. Besides, the coordination interaction between the lone-pair electrons on the N atoms of the amino (-NH2) group and the Al atoms may prohibit interaction between Al and the thiophene rings of P3HT, contributing to the efficiency enhancement of the CBL-incorporated devices as well. In this sense, the different CBL performance of biuret, DCDA, and urea is also proposed to partially originate from the differences on their chemical structure, specifically the number of amino groups.
收录类别	SCI
语种	英语
WOS记录号	WOS:000333551500071
公开日期	2015-02-03
内容类型	期刊论文
源URL	[http://ir.sinano.ac.cn/handle/332007/1772]
专题	苏州纳米技术与纳米仿生研究所_纳米研究国际实验室_陈立桅团队
推荐引用方式 GB/T 7714	Chen, LW . Application of Biuret, Dicyandiamide, or Urea as a Cathode Buffer Layer toward the Efficiency Enhancement of Polymer Solar Cells[J]. ACS APPLIED MATERIALS & INTERFACES,2014,6(6):4329-4337.
APA	Chen, LW .(2014).Application of Biuret, Dicyandiamide, or Urea as a Cathode Buffer Layer toward the Efficiency Enhancement of Polymer Solar Cells.ACS APPLIED MATERIALS & INTERFACES,6(6),4329-4337.
MLA	Chen, LW ."Application of Biuret, Dicyandiamide, or Urea as a Cathode Buffer Layer toward the Efficiency Enhancement of Polymer Solar Cells".ACS APPLIED MATERIALS & INTERFACES 6.6(2014):4329-4337.