PEDOT:PSS monolayers to enhance the hole extraction and stability of perovskite solar cells

doi:10.1039/c8ta05234d

	PEDOT:PSS monolayers to enhance the hole extraction and stability of perovskite solar cells
	Hu, Lijun 1; Li, Meng 1; Yang, Ke 1; Xiong, Zhuang 1; Yang, Bo 2; Wang, Ming 2; Tang, Xiaosheng 2; Zang, Zhigang 2; Liu, Xixia 3; Li, Bichen 3
刊名	Journal of Materials Chemistry A
	2018
卷号	6 期号:34 页码:16583-16589
ISSN号	20507488
DOI	10.1039/c8ta05234d
英文摘要	A hole transport layer (HTL) plays a key role in efficient hole extraction and transfer in inverted planar perovskite solar cells. A 10-20 nm thick poly (3,4-ethylenedioxythiphene):poly(styrenesulfonate) (PEDOT:PSS) layer is the most popular HTL in such a device structure. But is it essential to construct such a thick PEDOT:PSS layer? To address this question, herein self-assembled PEDOT:PSS monolayers are obtained on the indium tin oxide (ITO) surface through a facile water rinsing process. Perovskite solar cells with water rinsed PEDOT:PSS as a HTL yield improved power conversion efficiency (PCE) from 13.4% to 18.0%, compared with the control cells with as-cast PEDOT:PSS. The main contribution is from the open-circuit voltage (Voc) and fill factor (FF). Characterization indicates that the majority of PEDOT:PSS is washed away, but an ultra-thin layer of PEDOT:PSS can attach strongly onto ITO via In-O-S chemical bonds between the PSS chain and ITO. Subsequently, PEDOT and PSS form a bilayered structure due to Coulomb interaction. Such an arrangement induces an oriented electric field from positively charged PEDOT to negatively charged PSS, which can accelerate the process of hole extraction. Moreover, the oriented arrangement of PEDOT:PSS monolayers provides higher work function and stronger hydrophobicity, leading to the enhancement in Voc and stability in the ambient environment. This work suggests that there is still room for the efficiency improvement of perovskite solar cells by optimizing the traditional functional layers. © 2018 The Royal Society of Chemistry.
电子版国际标准刊号	20507496
语种	英语
内容类型	期刊论文
源URL	[http://119.78.100.138/handle/2HOD01W0/7992]
专题	中国科学院重庆绿色智能技术研究院
作者单位	1.Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, School of Power Engineering, Chongqing University, Chongqing; 400044, China; 2.Key Laboratory of Optoelectronic Technology and Systems, Ministry of Education, Chongqing; 400044, China; 3.Department of Materials Science and Engineering, National University of Singapore, Singapore; 117574, Singapore; 4.Chongqing Institute of Green and Intelligent Technology, CAS, 266 Fang Zheng Road, Chongqing; 400714, China
推荐引用方式 GB/T 7714	Hu, Lijun,Li, Meng,Yang, Ke,et al. PEDOT:PSS monolayers to enhance the hole extraction and stability of perovskite solar cells[J]. Journal of Materials Chemistry A,2018,6(34):16583-16589.
APA	Hu, Lijun.,Li, Meng.,Yang, Ke.,Xiong, Zhuang.,Yang, Bo.,...&Sun, Kuan.(2018).PEDOT:PSS monolayers to enhance the hole extraction and stability of perovskite solar cells.Journal of Materials Chemistry A,6(34),16583-16589.
MLA	Hu, Lijun,et al."PEDOT:PSS monolayers to enhance the hole extraction and stability of perovskite solar cells".Journal of Materials Chemistry A 6.34(2018):16583-16589.