Journal article 963 views 193 downloads
π-Conjugated small molecules enable efficient perovskite growth and charge-extraction for high-performance photovoltaic devices
Journal of Power Sources, Volume: 448, Start page: 227420
Swansea University Author:
Wing Chung Tsoi
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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...
Published in: | Journal of Power Sources |
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ISSN: | 0378-7753 |
Published: |
Elsevier BV
2020
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Online Access: |
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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. |
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Keywords: |
π-conjugated molecule, Energy level alignment, Charge extraction |
College: |
Professional Services |
Start Page: |
227420 |