Stable High-Performance Perovskite Solar Cells via Grain Boundary Passivation
Type
ArticleAuthors
Niu, TianqiLu, Jing
Munir, Rahim

Li, Jianbo
Barrit, Dounya

Zhang, Xu
Hu, Hanlin

Yang, Zhou
Amassian, Aram

Zhao, Kui

Liu, Shengzhong Frank

KAUST Department
KAUST Solar Center (KSC)Material Science and Engineering Program
Organic Electronics and Photovoltaics Group
Physical Science and Engineering (PSE) Division
Date
2018-03-12Online Publication Date
2018-03-12Print Publication Date
2018-04Permanent link to this record
http://hdl.handle.net/10754/627469
Metadata
Show full item recordAbstract
The trap states at grain boundaries (GBs) within polycrystalline perovskite films deteriorate their optoelectronic properties, making GB engineering particularly important for stable high-performance optoelectronic devices. It is demonstrated that trap states within bulk films can be effectively passivated by semiconducting molecules with Lewis acid or base functional groups. The perovskite crystallization kinetics are studied using in situ synchrotron-based grazing-incidence X-ray scattering to explore the film formation mechanism. A model of the passivation mechanism is proposed to understand how the molecules simultaneously passivate the Pb-I antisite defects and vacancies created by under-coordinated Pb atoms. In addition, it also explains how the energy offset between the semiconducting molecules and the perovskite influences trap states and intergrain carrier transport. The superior optoelectronic properties are attained by optimizing the molecular passivation treatments. These benefits are translated into significant enhancements of the power conversion efficiencies to 19.3%, as well as improved environmental and thermal stability of solar cells. The passivated devices without encapsulation degrade only by ≈13% after 40 d of exposure in 50% relative humidity at room temperature, and only ≈10% after 24 h at 80 °C in controlled environment.Citation
Niu T, Lu J, Munir R, Li J, Barrit D, et al. (2018) Stable High-Performance Perovskite Solar Cells via Grain Boundary Passivation. Advanced Materials: 1706576. Available: http://dx.doi.org/10.1002/adma.201706576.Sponsors
K.Z. and T.N. designed and performed most of the experiments. R.M., D.B., and A.A. acquired in situ GIWAXS measurements and analyzed the data. J.L., J.L., and Z.Y. helped SEM test and TRPL measurements. H.H. performed TEM measurements. X.Z. helped trap density measurements. K.Z., A.A., S.(F.)L., and T.N. contributed to the writing of the paper. This work was supported by the National Key Research and Development Program of China (2017YFA0204800, 2016YFA0202403), National Natural Science Foundation of China (61604092, 61674098), National University Research Fund (Grant Nos. GK261001009, GK201603055), the 111 Project (B14041), and National 1000-talent-plan program (1110010341). GIWAXS measurements were performed at D-line in the Cornell High Energy Synchrotron Source (CHESS) and helped by the King Abdullah University of Science and Technology (KAUST). CHESS is supported by the NSF Award DMR-1332208.Publisher
WileyJournal
Advanced MaterialsPubMed ID
29527750Additional Links
http://onlinelibrary.wiley.com/doi/10.1002/adma.201706576/fullae974a485f413a2113503eed53cd6c53
10.1002/adma.201706576
Scopus Count
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