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π-Conjugated small molecules enable efficient perovskite growth and charge-extraction for high-performance photovoltaic devices

Hui Liu, Hai-Rui Liu, Feng Yang, Ji-En Yang, Jian Song, Meng Li, Zhe Li, Wing Chung Tsoi Orcid Logo, Martin Chinweokwu Eze, Zhi-Yong Liu, Heng Ma, Min Gao, Zhao-Kui Wang

Journal of Power Sources, Volume: 448, Start page: 227420

Swansea University Author: Wing Chung Tsoi Orcid Logo

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DOI (Published version): 10.1016/j.jpowsour.2019.227420

Abstract

A π-conjugated small molecule N,N′-bis(naphthalen-1-yl)-N,N’+-bis(phenyl)benzidine (NPB) is introduced into a poly (bis(4-phenyl)(2,4,6-trimethylphenyl)amine) (PTAA) hole transport layer in inverted perovskite solar cells (PSCs). The NPB doping induces better perovskite crystal growth owing to a str...

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Published in: Journal of Power Sources
ISSN: 0378-7753 1873-2755
Published: Elsevier BV 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa52942
Abstract: A π-conjugated small molecule N,N′-bis(naphthalen-1-yl)-N,N’+-bis(phenyl)benzidine (NPB) is introduced into a poly (bis(4-phenyl)(2,4,6-trimethylphenyl)amine) (PTAA) hole transport layer in inverted perovskite solar cells (PSCs). The NPB doping induces better perovskite crystal growth owing to a strong π-π interaction with PTAA and cation-π interactions with CH3NH3+ (MA+). In addition, NPB doping not only improves the wettability of PTAA and regulates the perovskite crystallization to achieve a larger grain size, but also moves the valence band energy of the hole transport layer closer to the perovskite layer. Consequently, the fabricated PSCs delivered a power conversion efficiency (PCE) of 20.15%, with a short-circuit current density (JSC) of 22.60 mA/cm2 and open-circuit voltage (VOC) of 1.14 V. This outcome indicates that PTAA:NPB composite materials present great potential for fabricating high-performance PSCs.
Keywords: π-conjugated molecule, Energy level alignment, Charge extraction
College: Faculty of Science and Engineering
Funders: This work was supported by the National Natural Science Foundation of China (No. 51502081; G11747069), Science and Technique Program of Henan Province (No. 182102210375), Henan Provincial Basic and Frontier Project (No. 152300410088), Henan Provincial Key Science and Technology Research Projects (No. 192102210173) and Key Scientific Research Projects of Henan Education Department (NO. 20A140017). This project is also funded by the Collaborative Innovation Center of Suzhou Nano Science and Technology, and by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD). And the International Postdoctoral Exchange Fellowship Program between Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, OCPC and Soochow University (Chinese home organization).
Start Page: 227420

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