Yang Baia,b, Jinsong Huanga*

 

aDepartment of Mechanical and Materials Engineering, College of Engineering, University of Nebraska-Lincoln, Nebraska 68588-0656, USA.
b
Current address: Nanomaterials Centre, Australian Institute of Biotechnology and Nanotechnology, The University of Queensland, St Lucia, QLD 4072, Australia
*Corresponding Author’s E-mail: jhuang2@unl.edu

 

Organolead trihalide perovskite solar cells have been attracting tremendous attention in both scientific and industrial communities in the past few years owing to the soaring efficiency achieved. However, the instability of hybrid perovskite materials to water and moisture arises as one of the major challenges to be addressed before any practical application. Here we report a facile strategy that can simultaneously enhance the stability and efficiency of p-i-n planar heterojunction-structure perovskite devices. Crosslinkable molecules with hydrophobic function groups are bonded onto fullerene to turn the fullerene layer into water-resistant. Methylammonia iodide is introduced in the crosslinked fullerene layer for n-doping via anion-induced electron transfer, resulting in dramatically increased conductivity by >100 times. With crosslinkable silane functionalized and doped fullerene electron transport layer, the perovskite devices deliver an efficiency of 19.5% with a high fill factor of 80.6%. Crosslinked silane modified fullerene layer also enhances the water and moisture stability of the non-sealed perovskite devices by retaining nearly 90% of their original efficiencies after 30 days exposure in ambient environment. This work has paved a new way towards addressing the main hindrance to the practical application of perovskite devices under ambient conditions.

References

[1] Bai, Y.; Dong, Q.; Shao, Y.; Deng, Y.; Wang, Q.; Shen, L.; Wang, D.; Wei, W.; Huang, J., Nature Communication  2016, 7, 12806. Enhancing stability and efficiency of perovskite solar cells with crosslinable silane-functionalized and doped fullerene.

Biographic Details

Yang Bai

Title: UQ Development Fellow

Affiliation: Nanomaterials Centre, Australian Institute of Biotechnology and Nanotechnology, The University of Queensland, Country: Australia

Phone: +61 334 63830 E-mail: y.bai@uq.edu.au

Research interests: New-generation thin film solar cells

Yang Bai received his Ph.D. degree from the School of Chemical Engineering, The University of Queensland (UQ), Australia in 2014. In early 2015, he joined Professor Jinsong Huang’s group at the University of Nebraska-Lincoln in the United States as a postdoctoral research associate. As a recipient of prestigious UQ Development Fellowship, he returned to UQ and joined Professor Lianzhou Wang’s group in early 2017. His current research interests focus on the interface engineering for efficient and stable perovskite solar cells, perovskite based integrated devices, and quantum dot solar cells.