Efficient and Stable Inverted Perovskite Solar Cells Incorporating Secondary Amines

Hao Chen; Qi Wei; Makhsud I Saidaminov; Fei Wang; Andrew Johnston; Yi Hou; Zijian Peng; Kaimin Xu; Wenjia Zhou; Zhenghao Liu; Lu Qiao; Xiao Wang; Siwen Xu; Jiangyu Li; Run Long; Youqi Ke; Edward H Sargent; Zhijun Ning

doi:10.1002/adma.201903559

Efficient and Stable Inverted Perovskite Solar Cells Incorporating Secondary Amines

Adv Mater. 2019 Nov;31(46):e1903559. doi: 10.1002/adma.201903559. Epub 2019 Sep 30.

Authors

Hao Chen^{1

2

3}, Qi Wei¹, Makhsud I Saidaminov⁴, Fei Wang¹, Andrew Johnston⁴, Yi Hou⁴, Zijian Peng¹, Kaimin Xu¹, Wenjia Zhou¹, Zhenghao Liu⁵, Lu Qiao⁶, Xiao Wang¹, Siwen Xu¹, Jiangyu Li^{5

7}, Run Long⁶, Youqi Ke¹, Edward H Sargent⁴, Zhijun Ning¹

Affiliations

¹ School of Physical Science and Technology, ShanghaiTech University, Shanghai, 201210, P. R. China.
² School of Chemistry and Chemical Engineering, University of Chinese Academy of Science, Beijing, 100049, P. R. China.
³ Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai, 200050, P. R. China.
⁴ Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, M5S 3G4, Canada.
⁵ Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, Guangdong, P. R. China.
⁶ College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, Beijing Normal University, Beijing, 100875, P. R. China.
⁷ Department of Mechanical Engineering, University of Washington, Seattle, WA, 98195-2600, USA.

PMID: 31566819
DOI: 10.1002/adma.201903559

Abstract

Large-bandgap perovskites offer a route to improve the efficiency of energy capture in photovoltaics when employed in the front cell of perovskite-silicon tandems. Implementing perovskites as the front cell requires an inverted (p-i-n) architecture; this architecture is particularly effective at harnessing high-energy photons and is compatible with ionic-dopant-free transport layers. Here, a power conversion efficiency of 21.6% is reported, the highest among inverted perovskite solar cells (PSCs). Only by introducing a secondary amine into the perovskite structure to form MA_1- _x DMA_x PbI₃ (MA is methylamine and DMA is dimethylamine) are defect density and carrier recombination suppressed to enable record performance. It is also found that the controlled inclusion of DMA increases the hydrophobicity and stability of films in ambient operating conditions: encapsulated devices maintain over 80% of their efficiency following 800 h of operation at the maximum power point, 30 times longer than reported in the best prior inverted PSCs. The unencapsulated devices show record operational stability in ambient air among PSCs.

Keywords: defect density; inverted structure; perovskite solar cells; secondary amine; stability.

Abstract

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