Perovskite Bifunctional Device with Improved Electroluminescent and Photovoltaic Performance through Interfacial Energy-Band Engineering

Jiangsheng Xie; Pengjie Hang; Han Wang; Shenghe Zhao; Ge Li; Yanjun Fang; Feng Liu; Xinlu Guo; Hepeng Zhu; Xinhui Lu; Xuegong Yu; Christopher C S Chan; Kam Sing Wong; Deren Yang; Jianbin Xu; Keyou Yan

doi:10.1002/adma.201902543

Perovskite Bifunctional Device with Improved Electroluminescent and Photovoltaic Performance through Interfacial Energy-Band Engineering

Adv Mater. 2019 Aug;31(33):e1902543. doi: 10.1002/adma.201902543. Epub 2019 Jun 24.

Authors

Jiangsheng Xie^{1

2}, Pengjie Hang³, Han Wang¹, Shenghe Zhao¹, Ge Li³, Yanjun Fang³, Feng Liu¹, Xinlu Guo¹, Hepeng Zhu², Xinhui Lu⁴, Xuegong Yu³, Christopher C S Chan⁵, Kam Sing Wong⁵, Deren Yang³, Jianbin Xu¹, Keyou Yan^{1

2}

Affiliations

¹ Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, 999077, P. R. China.
² School of Environment and Energy, State Key Laboratory of Luminescent Materials and Devices, National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, South China University of Technology, Guangzhou, 510006, P. R. China.
³ State Key Laboratory of Silicon Materials and School of Materials Science & Engineering, Zhejiang University, Hangzhou, 310027, P. R. China.
⁴ Department of Physics, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, P. R. China.
⁵ Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, P. R. China.

PMID: 31231879
DOI: 10.1002/adma.201902543

Abstract

Currently, photovoltaic/electroluminescent (PV/EL) perovskite bifunctional devices (PBDs) exhibit poor performance due to defects and interfacial misalignment of the energy band. Interfacial energy-band engineering between the perovskite and hole-transport layer (HTL) is introduced to reduce energy loss, through adding corrosion-free 3,3'-(2,7-dibromo-9H-fluorene-9,9-diyl) bis(n,n-dimethylpropan-1-amine) (FN-Br) into a HTL free of lithium salt. This strategy can turn the n-type surface of perovskite into p-type and thus correct the misalignment to form a well-defined N-I-P heterojunction. The tailored PBD achieves a high PV efficiency of up to 21.54% (certified 20.24%) and 4.3% EL external quantum efficiency. Free of destructive additives, the unencapsulated devices maintain >92% of their initial PV performance for 500 h at maximum power point under standard air mass 1.5G illumination. This strategy can serve as a general guideline to enhance PV and EL performance of perovskite devices while ensuring excellent stability.

Keywords: corrosion-free additives; halide perovskites; interfacial engineering; photovoltaic/electroluminescent bifunction.

Abstract

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