Importance of PbI2 morphology in two-step deposition of CH3NH3PbI3 for high-performance perovskite solar cells

doi:10.1088/1674-1056/26/12/128801

中国物理B ›› 2017, Vol. 26 ›› Issue (12): 128801-128801.doi: 10.1088/1674-1056/26/12/128801

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇下一篇

Importance of PbI₂ morphology in two-step deposition of CH₃NH₃PbI₃ for high-performance perovskite solar cells

Hui Wei(韦慧), Yang Tang(汤洋), Bo Feng(冯波), Hui You(尤晖)

1. Beijing Engineering Research Center of Nano-structured Thin Film Solar Cell, National Institute of Clean-and-Low-Carbon Energy, Beijing 102209, China;
2. Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031, China

收稿日期:2017-06-26 修回日期:2017-08-23 出版日期:2017-12-05 发布日期:2017-12-05
通讯作者: Yang Tang E-mail:tangy118@hotmail.com
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 61404007) and the Beijing Talents Fund, China (Grant No. 2015000021223ZK38).

Importance of PbI₂ morphology in two-step deposition of CH₃NH₃PbI₃ for high-performance perovskite solar cells

Hui Wei(韦慧)^1,2, Yang Tang(汤洋)¹, Bo Feng(冯波)¹, Hui You(尤晖)²

1. Beijing Engineering Research Center of Nano-structured Thin Film Solar Cell, National Institute of Clean-and-Low-Carbon Energy, Beijing 102209, China;
2. Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031, China

Received:2017-06-26 Revised:2017-08-23 Online:2017-12-05 Published:2017-12-05
Contact: Yang Tang E-mail:tangy118@hotmail.com
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 61404007) and the Beijing Talents Fund, China (Grant No. 2015000021223ZK38).

摘要/Abstract

摘要： Controlling the morphology of the perovskite film is an effective way to improve the photoelectric conversion efficiency of solar cell devices. In this work, we study the influence of the crystallization condition on PbI₂ morphology and the performances of resulting perovskite solar cells. The PbI₂ morphologies and coverage rates under different formation conditions such as solvent effect, slow crystallization at room temperature and substrate-preheating, are found to be of crucial importance for preparing high-quality perovskite. The generation of loosely packed disk-like PbI₂ film with interpenetrating nanopores promotes the penetration of methyl ammonium iodide (MAI), leading to a better crystallinity of the perovskite film, and a best repeatable power conversion efficiency of 11.59% is achieved when methyl ammonium lead triiodide (CH₃NH₃PbI₃, MAPbI₃) is employed. In addition, an excellent device is also obtained with an efficiency of more than 93% to remain after working for 43 days.

关键词: morphology, PbI₂ solution, perovskite, solar cells, crystallization

Abstract: Controlling the morphology of the perovskite film is an effective way to improve the photoelectric conversion efficiency of solar cell devices. In this work, we study the influence of the crystallization condition on PbI₂ morphology and the performances of resulting perovskite solar cells. The PbI₂ morphologies and coverage rates under different formation conditions such as solvent effect, slow crystallization at room temperature and substrate-preheating, are found to be of crucial importance for preparing high-quality perovskite. The generation of loosely packed disk-like PbI₂ film with interpenetrating nanopores promotes the penetration of methyl ammonium iodide (MAI), leading to a better crystallinity of the perovskite film, and a best repeatable power conversion efficiency of 11.59% is achieved when methyl ammonium lead triiodide (CH₃NH₃PbI₃, MAPbI₃) is employed. In addition, an excellent device is also obtained with an efficiency of more than 93% to remain after working for 43 days.

Key words: morphology, PbI₂ solution, perovskite, solar cells, crystallization

中图分类号: (Efficiency and performance of solar cells)

88.40.hj

84.60.Jt (Photoelectric conversion) 78.56.-a (Photoconduction and photovoltaic effects)

韦慧, 汤洋, 冯波, 尤晖. Importance of PbI₂ morphology in two-step deposition of CH₃NH₃PbI₃ for high-performance perovskite solar cells[J]. 中国物理B, 2017, 26(12): 128801-128801.

Hui Wei(韦慧), Yang Tang(汤洋), Bo Feng(冯波), Hui You(尤晖). Importance of PbI₂ morphology in two-step deposition of CH₃NH₃PbI₃ for high-performance perovskite solar cells[J]. Chin. Phys. B, 2017, 26(12): 128801-128801.

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Importance of PbI₂ morphology in two-step deposition of CH₃NH₃PbI₃ for high-performance perovskite solar cells

Importance of PbI₂ morphology in two-step deposition of CH₃NH₃PbI₃ for high-performance perovskite solar cells

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