Polymer interface engineering enabling high-performance perovskite solar cells with improved fill factors of over 82%

Quanzeng Zhang; Shaobing Xiong; Jazib Ali; Kun Qian; Yu Li; Wei Feng; Hailin Hu; Jingnan Song; Feng Liu

doi:10.1039/C9TC06578D

Polymer interface engineering enabling high-performance perovskite solar cells with improved fill factors of over 82%†

Quanzeng Zhang,^a Shaobing Xiong,^b Jazib Ali,^a Kun Qian,

^a Yu Li,

^ac Wei Feng,^d Hailin Hu,^e Jingnan Song*^a and Feng Liu

*^ac

Author affiliations

* Corresponding authors

^a School of Physics and Astronomy, and Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai, China
E-mail: sjn199319@sjtu.edu.cn, fengliu82@sjtu.edu.cn

^b Key Laboratory of Polar Materials and Devices, Ministry of Education, East China Normal University, 200241 Shanghai, P. R. China

^c School of Chemistry and Chemical Engineering, and Center for Advanced Electronic Materials and Devices, Shanghai Jiao Tong University, Shanghai, China

^d State Key Laboratory of Fluorinated Materials, Zibo City, Shandong 256401, China

^e Instituto de Energías Renovables, Universidad Nacional Autonoma de Mexico, Mexico

Abstract

The solution-processed perovskite films inevitably induce defects, adversely affecting the device performance and environmental stability. Motivated by the small molecular passivation agents, a systematic work is carried out to reveal the role of P4VP polymer in perovskite solar cells. The introduction of P4VP polymer can reduce the defects at the surfaces and grain boundaries by coordinating with undercoordinated lead sites. The substantially reduced defect density leads to reduced non-radiative recombination, and extended electron diffusion length. Furthermore, a good match of energy levels at the perovskite/PCBM interface is achieved, which favors efficient electron extraction and suppresses the hole transfer. As a result, the power conversion efficiency increases from 17.46% to 20.02% after defect-passivation and improved energy level alignment with a significantly enhanced fill factor of 82.61% and improved open circuit voltage of 1.09. In addition, the non-encapsulated devices exhibit enhanced moisture stability (60 ± 5% humidity) and thermal stability (85 °C) after P4VP incorporation.

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DOI: https://doi.org/10.1039/C9TC06578D
Article type: Paper
Submitted: 02 Dec 2019
Accepted: 24 Feb 2020
First published: 24 Feb 2020

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J. Mater. Chem. C, 2020,8, 5467-5475

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Polymer interface engineering enabling high-performance perovskite solar cells with improved fill factors of over 82%

Q. Zhang, S. Xiong, J. Ali, K. Qian, Y. Li, W. Feng, H. Hu, J. Song and F. Liu, J. Mater. Chem. C, 2020, 8, 5467 DOI: 10.1039/C9TC06578D

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Journal of Materials Chemistry C

Polymer interface engineering enabling high-performance perovskite solar cells with improved fill factors of over 82%†

Abstract

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Polymer interface engineering enabling high-performance perovskite solar cells with improved fill factors of over 82%

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