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	Vapor-fumigation for record efficiency two-dimensional perovskite solar cells with superior stability
	Zhu, Xuejie1; Xu, Zhuo1; Zuo, Shengnan1; Feng, Jiangshan1; Wang, Ziyu2; Zhang, Xiaorong1; Zhao, Kui1; Zhang, Jian3; Liu, Hairui4; Priya, Shashank4
刊名	Energy & environmental science
	2018-12-01
卷号	11期号:12页码:3349-3357
ISSN号	1754-5692
DOI	10.1039/c8ee02284d
通讯作者	Priya, shashank(spriya@vt.edu) ; Liu, shengzhong frank(szliu@dicp.ac.cn) ; Yang, dong(dongyang@snnu.edu.cn)
英文摘要	Two-dimensional (2d) perovskites have emerged as prospective candidates for high performance perovskite solar cells (pscs) due to their remarkable environmental stability. however, their power conversion efficiency (pce) is much lower than that of their 3d counterparts owing to large exciton binding energy, poor carrier transport, and low conductivity. herein, we developed a methylammonium (ma) based 2d perovskite thin film using vapor-fumigation technology. compared to the traditional 2d perovskite based on bulky butylammonium (ba) cations, its exciton binding energy significantly decreased to 172 mev from 510 mev, as calculated by first-order perturbation theory and an infinite barrier approximation, due to the high dielectric constant of ma. according to the wkb approximation, the tunneling probability of a carrier through a quantum well increased by four orders of magnitude because of the smaller layer thickness, which was confirmed by xrd (the layer spacing decreased to 9.08 angstrom of ma(2)pbi(4) from 13.39 angstrom of ba(2)pbi(4)). in addition, theoretical calculations and experimental analysis reveal that the ma(2)pbi(4) perovskite possesses a narrow band gap, good conductivity, and a low trap density. as a result, the pce of the 2d pscs reached 16.92%, and the certified efficiency was 16.6% according to the national institute of metrology (nim), the highest efficiency value so far for 2d pscs. furthermore, the ma(2)pbi(4) devices exhibited superior long-term stability under illumination and exposure to environmental conditions. the pces of the 2d perovskite devices without encapsulation degraded by only 2.2% from their initial values when exposed to ambient conditions at similar to 55% relative humidity for 1512 hours. meanwhile, the efficiency remained 97.2% of its initial value when the device was continuously illuminated for 500 hours at 60 degrees c in argon. even after following the illumination test with light-soaking for over 500 h in ambient air, the pce of the unsealed device suffered only a minor degradation of 3.8%.
WOS关键词	J-V HYSTERESIS ; HALIDE PEROVSKITES ; OPTICAL-PROPERTIES ; ELECTRON ; EXCITONS ; TRANSITIONS ; PERFORMANCE
WOS研究方向	Chemistry ; Energy & Fuels ; Engineering ; Environmental Sciences & Ecology
WOS类目	Chemistry, Multidisciplinary ; Energy & Fuels ; Engineering, Chemical ; Environmental Sciences
语种	英语
出版者	ROYAL SOC CHEMISTRY
WOS记录号	WOS:000452317700003
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2372980
专题	大连化学物理研究所
通讯作者	Priya, Shashank; Liu, Shengzhong Frank; Yang, Dong
作者单位	1.Shaanxi Normal Univ, Key Lab Appl Surface & Colloid Chem, Shaanxi Engn Lab Adv Energy Technol, Natl Minist Educ,Sch Mat Sci & Engn, Xian 710119, Shaanxi, Peoples R China 2.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, State Key Lab Catalysis, Dalian 116023, Peoples R China 3.Guilin Univ Elect Technol, Sch Mat Sci & Engn, Guangxi Key Lab Informat Mat, Guilin 541004, Peoples R China 4.Penn State, Mat Sci & Engn, University Pk, PA 16802 USA
推荐引用方式 GB/T 7714	Zhu, Xuejie,Xu, Zhuo,Zuo, Shengnan,et al. Vapor-fumigation for record efficiency two-dimensional perovskite solar cells with superior stability[J]. Energy & environmental science,2018,11(12):3349-3357.
APA	Zhu, Xuejie.,Xu, Zhuo.,Zuo, Shengnan.,Feng, Jiangshan.,Wang, Ziyu.,...&Yang, Dong.(2018).Vapor-fumigation for record efficiency two-dimensional perovskite solar cells with superior stability.Energy & environmental science,11(12),3349-3357.
MLA	Zhu, Xuejie,et al."Vapor-fumigation for record efficiency two-dimensional perovskite solar cells with superior stability".Energy & environmental science 11.12(2018):3349-3357.

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