Please use this identifier to cite or link to this item: http://hdl.handle.net/1783.1/85189

Boron Doping of Multiwalled Carbon Nanotubes Significantly Enhances Hole Extraction in Carbon-Based Perovskite Solar Cells

Authors Zheng, Xiaoli HKUST affiliated (currently or previously)
Chen, Haining HKUST affiliated (currently or previously)
Li, Qiang HKUST affiliated (currently or previously)
Yang, Yinglong HKUST affiliated (currently or previously)
Wei, Zhanhua HKUST affiliated (currently or previously)
Bai, Yang HKUST affiliated (currently or previously)
Qiu, Yongcai HKUST affiliated (currently or previously)
Zhou, Dan HKUST affiliated (currently or previously)
Wong, Kam Sing View this author's profile
Yang, Shihe View this author's profile
Issue Date 2017
Source Nano Letters , v. 17, (4), April 2017, p. 2496-2505
Summary Compared to the conventional perovskite solar cells (PSCs) containing hole-transport materials (HTM), carbon materials based HTM-free PSCs (C-PSCs) have often suffered from inferior power conversion efficiencies (PCEs) arising at least partially from the inefficient hole extraction at the perovskite-carbon interface. Here, we show that boron (B) doping of multiwalled carbon nanotubes (B-MWNTs) electrodes are superior in enabling enhanced hole extraction and transport by increasing work function, carrier concentration, and conductivity of MWNTs. The C-PSCs prepared using the B-MWNTs as the counter electrodes to extract and transport hole carriers have achieved remarkably higher performances than that with the undoped MWNTs, with the resulting PCE being considerably improved from 10.70% (average of 9.58%) to 14.60% (average of 13.70%). Significantly, these cells show negligible hysteretic behavior. Moreover, by coating a thin layer of insulating aluminum oxide (Al2O3) on the mesoporous TiO2 film as a physical barrier to substantially reduce the charge losses, the PCE has been further pushed to 15.23% (average 14.20%). Finally, the impressive durability and stability of the prepared C-PSCs were also testified under various conditions, including long-term air exposure, heat treatment, and high humidity. © 2017 American Chemical Society.
Subjects
ISSN 1530-6984
Language English
Format Article
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