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3D bimetallic selenide-based carbon nanoblocks “dressed” on 2D MXene nanosheets for efficient hole transport layer-free carbon-based perovskite solar cells: constructing functionalized Mott-Schottky junction for carrier transport
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DOI：10.1039/D6TA03325C.png)
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Abstract
En 中文
Developing novel carbon electrodes with high carrier mobility and energy level alignment is pivotal for advancing hole transport layer-free carbon-based perovskite solar cells (HTL-free C-PSCs). Herein; we present a hierarchical strategy involving 3D bimetallic selenide-composite nitrogen-doped carbon nanoblocks “dressed” on 2D MXene nanosheets through in-situ assembly to construct multifaceted CoSe2/FeSe2-NC@MXene (CS/FS-NC@MXene) electrodes. This design integrates the high conductivity of MXene; photoelectrochemical activity of bimetallic selenides; and efficient carrier transport of 3D carbon frameworks. Critically; the composite electrode features an electron-rich field induced by a functionalized Mott-Schottky heterojunction and a matched work function; significantly enhancing carrier separation and extraction. Furthermore; the oxygen-containing groups on MXene and the abundant nitrogen sites within the carbon framework effectively passivate the uncoordinated Pb2+ ions in the perovskite layer. As a result; the assembled HTL-free C-PSCs based on CS/FS-NC@MXene achieve a notable power conversion efficiency of 16.16 % and excellent long-term stability; retaining over 92% of initial efficiency after 30 days. This work demonstrates a synergistic nano-microstructural and electronic modulation strategy; offering new insights into designing high-performance carbon electrodes for advanced photovoltaic devices.
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