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

Liu, Hui, Liu, Hai-Rui, Yang, Feng, Yang, Ji-En, Song, Jian, Li, Meng, Li, Zhe, Tsoi, Wing Chung, Eze, Martin Chinweokwu, Liu, Zhi-Yong, Ma, Heng, Gao, Min and Wang, Zhao-Kui 2020. π-Conjugated small molecules enable efficient perovskite growth and charge-extraction for high-performance photovoltaic devices. Journal of Power Sources 448 , 227420. 10.1016/j.jpowsour.2019.227420
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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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Elsevier
ISSN: 0378-7753
Date of First Compliant Deposit: 16 December 2019
Date of Acceptance: 6 November 2019
Last Modified: 31 Jul 2020 01:35
URI: http://orca.cf.ac.uk/id/eprint/127386

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