Volume 4, Issue 5 2000060
Communication

Tailoring Perovskite Adjacent Interfaces by Conjugated Polyelectrolyte for Stable and Efficient Solar Cells

Bowei Li

Bowei Li

Advanced Technology Institute, Department of Electrical and Electronic Engineering, University of Surrey, Guildford, Surrey, GU2 7XH UK

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Yuren Xiang

Yuren Xiang

Advanced Technology Institute, Department of Electrical and Electronic Engineering, University of Surrey, Guildford, Surrey, GU2 7XH UK

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K. D. G. Imalka Jayawardena

K. D. G. Imalka Jayawardena

Advanced Technology Institute, Department of Electrical and Electronic Engineering, University of Surrey, Guildford, Surrey, GU2 7XH UK

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Deying Luo

Deying Luo

State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, School of Physics, Frontiers Science Center for Nano-optoelectronics & Collaborative Innovation Center of Quantum Matter, Peking University, Beijing, 100871 China

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John F. Watts

John F. Watts

The Surface Analysis Laboratory, Department of Mechanical Engineering Sciences, University of Surrey, Guildford, Surrey, GU2 7XH UK

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Steven Hinder

Steven Hinder

The Surface Analysis Laboratory, Department of Mechanical Engineering Sciences, University of Surrey, Guildford, Surrey, GU2 7XH UK

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Hui Li

Hui Li

Advanced Technology Institute, Department of Electrical and Electronic Engineering, University of Surrey, Guildford, Surrey, GU2 7XH UK

Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing, 100190 China

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Victoria Ferguson

Victoria Ferguson

Advanced Technology Institute, Department of Electrical and Electronic Engineering, University of Surrey, Guildford, Surrey, GU2 7XH UK

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Haitian Luo

Haitian Luo

Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing, 100190 China

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Rui Zhu

Rui Zhu

State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, School of Physics, Frontiers Science Center for Nano-optoelectronics & Collaborative Innovation Center of Quantum Matter, Peking University, Beijing, 100871 China

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S. Ravi P. Silva

Corresponding Author

S. Ravi P. Silva

Advanced Technology Institute, Department of Electrical and Electronic Engineering, University of Surrey, Guildford, Surrey, GU2 7XH UK

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Wei Zhang

Corresponding Author

Wei Zhang

Advanced Technology Institute, Department of Electrical and Electronic Engineering, University of Surrey, Guildford, Surrey, GU2 7XH UK

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First published: 15 February 2020
Citations: 29

Abstract

Interface engineering is an effective means to enhance the performance of thin-film devices, such as perovskite solar cells (PSCs). Herein, a conjugated polyelectrolyte, poly[(9,9-bis(3′-((N,N-dimethyl)-N-ethyl-ammonium)-propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)]di-iodide (PFN-I), is used at the interfaces between the hole transport layer (HTL)/perovskite and perovskite/electron transport layer simultaneously, to enhance the device power conversion efficiency (PCE) and stability. The fabricated PSCs with an inverted planar heterojunction structure show improved open-circuit voltage (Voc), short-circuit current density (Jsc), and fill factor, resulting in PCEs up to 20.56%. The devices maintain over 80% of their initial PCEs after 800 h of exposure to a relative humidity 35–55% at room temperature. All of these improvements are attributed to the functional PFN-I layers as they provide favorable interface contact and defect reduction.

Conflict of Interest

The authors declare no conflict of interest.

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