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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; 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

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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
Published: Elsevier BV 2020
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa52942
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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
Start Page: 227420