Concerted regulation on vertical orientation and film quality of two-dimensional ruddlesden-popper perovskite layer for
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ncerted regulation on vertical orientation and film quality of two-dimensional ruddlesden-popper perovskite layer for efficient solar cells 1,2
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Xianglan Tang , Xueying Wang , Ting Hu , Qingxia Fu , Xiaotian Hu , Zengqi Huang , 2,3 1,2,4* Shuqin Xiao & Yiwang Chen 1
College of Chemistry, Nanchang University, Nanchang 330031, China; Institute of Polymers and Energy Chemistry, Nanchang University, Nanchang 330031, China; 3 School of Materials Science and Engineering, Nanchang University, Nanchang 330031, China; 4 Institute of Advanced Scientific Research, Jiangxi Normal University, Nanchang 330022, China 2
Received May 27, 2020; accepted July 2, 2020; published online September 8, 2020
Recently, the two-dimensional (2D) ruddlesden-popper (RPP) perovskite has been successfully attracting great attention owing to their excellent electronic property and superior ambient stability. But 2D perovskite solar cells (PVSCs) with insulating large cations show a worse performance than three-dimensional (3D) PVSCs in general because of the worse charge transportation. In this work, dimethyl sulfoxide (DMSO) and KI were incorporated simultaneously to produce a synergistic effect on both film quality and orientation of 2D perovskite. With this strategy, a cavity-free 2D perovskite film was formed with vertically oriented crystal, and high quality film was obtained with decreased defects and increased crystallinity. Besides, profitable multiple phases were obtained for better spontaneous carrier separation and transportation. The 2D PVSCs based on (PEA)2(MA)nā1PbnI3n+1 (n=5) delivered a higher power conversion efficiency (PCE) of 13.4%. In addition, the perovskite with KI and DMSO contained more stable low-dimension phase at the bottom of perovskite film, which could act as a barrier to prevent moisture from further eroding internal perovskites. The optimized 2D PVSCs remained 90% of the PCE after being exposed in air (50%ā60% humidity, room temperature) with a continuous illumination for 300 h. vertical orientation, film quality, synergistic effect, multiple phases, spontaneous carrier separation property Citation:
Tang X, Wang X, Hu T, Fu Q, Hu X, Huang Z, Xiao S, Chen Y. Concerted regulation on vertical orientation and film quality of two-dimensional ruddlesden-popper perovskite layer for efficient solar cells. Sci China Chem, 2020, 63, https://doi.org/10.1007/s11426-020-9812-6
1 Introduction Organic-inorganic lead halide perovskite solar cells (PVSCs) have shown a rapid development. According to the latest report, three-dimensional (3D) perovskite based PVSCs has delivered the best power conversion efficiency (PCE) of over 25% [1]. PVSCs possess the advantages of the room-temperature processability and low-cost in fabrication, but the stability of 3D perovskite based PVSCs, especially in a hu*Corresponding authors (email: [email protected]; [email protected])
mid environment, is still a major limitation to their commercialization [2ā4]. By comparison, two-dimensional (2D) ruddlesden-popper (RPP) pe
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