Perovskite solar cells passivated by distorted two-dimensional structure

doi:10.7498/aps.68.20190306

	Perovskite solar cells passivated by distorted two-dimensional structure
	Fu Peng-Fei1,2,3 ; Yu Dan-Ni1 ; Peng Zi-Jian1 ; Gong Jin-Kang1 ; Ning Zhi-Jun1
	2019-08-05
发表期刊	物理学报 (IF:0.8[JCR-2023],0.8[5-Year])
ISSN	1000-3290
卷号	68 期号:15
发表状态	已发表
DOI	10.7498/aps.68.20190306
摘要	Hybrid perovskites are a series of solution-processable materials for photovoltaic devices. To achieve better performance and stability, interface passivation is an effective method. So far, the most commonly used passivators are organic amines, which can tailor perovskite into a lower-dimensional structure (RuddlesdenPopper perovskite). Here, we select a biimizole (BIM) molecule as a new passivator for perovskite. The BIM based single layer perovskite has a more rigid structure. And multi-layered structure cannot be formed due to large lattice mismatching and structural rigidity. By inducing the excess MAI (methanaminium iodide) into the lattice, the layered structure is maintained, and half of the BIM molecules are replaced by MA (methylamine). The mixed layered structure is distorted, because of the difference in size between two kinds of cations. We then investigate passivation effect of BIM on perovskite solar cells. By carefully controlling the feed ratio in precursor solutions, we fabricate solar cells with different passivation structures. We find that the introduction of BIM can cause V-oc to increase generally, indicating that MAPbI(3) is well passivated. The peak at 7.5 degrees and 15 degrees in X-ray diffraction pattern are corresponding to a two-dimensional (2D) phase with a shorter layer distance. There are no peaks at lower degrees, so that no multi-layered structure is formed in the film either. We suppose that a dual-phase 2D-3D (where 3D represents three-dimensional) structure is formed in the perovskite film. To explain the passivation effect of the two 2D structures, we investigate their lattice matching towards MAPbI(3). The distorted 2D structure is well matched with (110) face of o-MAPbI(3), and the mismatching rate is lower 1% in the two directions. On the other hand, the BIM based 2D structure cannot well match with (-110) face of o-MAPbI(3), nor with (001) face of c-MAPbI(3). We also consider that the less rigidity of distorted structure contributes to better passivation. As a result, we achieve a BIM passivated perovskite solar cell with a power conversion efficiency up to 14%. This work paves a new way to the interface engineering of perovskite solar cells.
关键词	perovskite solar cell two-dimensional structure
收录类别	SCI ; SCIE ; 北大核心 ; EI
语种	中文
资助项目	National Natural Science Foundation of China[21571129] ; National Natural Science Foundation of China[51572128]
WOS研究方向	Physics
WOS类目	Physics, Multidisciplinary
WOS记录号	WOS:000478690600029
出版者	CHINESE PHYSICAL SOC
EI主题词	Amines ; Cell engineering ; Hybrid materials ; Molecules ; Passivation ; Perovskite ; Rigidity ; Solar cells
WOS关键词	HALIDE PEROVSKITES ; STABILITY ; EFFICIENT
原始文献类型	Article
引用统计	正在获取...
文献类型	期刊论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/64567
专题	物质科学与技术学院_硕士生物质科学与技术学院_PI研究组_宁志军组物质科学与技术学院_PI研究组_龚晋慷组物质科学与技术学院_博士生
通讯作者	Ning Zhi-Jun
作者单位	1.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China 2.Shanghai Inst Ceram, Shanghai 200050, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
第一作者单位	物质科学与技术学院
通讯作者单位	物质科学与技术学院
第一作者的第一单位	物质科学与技术学院
推荐引用方式 GB/T 7714	Fu Peng-Fei,Yu Dan-Ni,Peng Zi-Jian,et al. Perovskite solar cells passivated by distorted two-dimensional structure[J]. 物理学报,2019,68(15).
APA	Fu Peng-Fei,Yu Dan-Ni,Peng Zi-Jian,Gong Jin-Kang,&Ning Zhi-Jun.(2019).Perovskite solar cells passivated by distorted two-dimensional structure.物理学报,68(15).
MLA	Fu Peng-Fei,et al."Perovskite solar cells passivated by distorted two-dimensional structure".物理学报 68.15(2019).