Synergistic Cascade Carrier Extraction via Dual Interfacial Positioning of Ambipolar Black Phosphorene for High-Efficiency Perovskite Solar Cells

Meng Zhang; Meidan Ye; Wenlong Wang; Chunyuan Ma; Shun Wang; Qiliang Liu; Tianquan Lian; Jinsong Huang; Zhiqun Lin

doi:10.1002/adma.202000999

Synergistic Cascade Carrier Extraction via Dual Interfacial Positioning of Ambipolar Black Phosphorene for High-Efficiency Perovskite Solar Cells

Adv Mater. 2020 Jul;32(28):e2000999. doi: 10.1002/adma.202000999. Epub 2020 May 14.

Authors

Meng Zhang^{1

2}, Meidan Ye¹, Wenlong Wang², Chunyuan Ma², Shun Wang³, Qiliang Liu⁴, Tianquan Lian⁴, Jinsong Huang⁵, Zhiqun Lin¹

Affiliations

¹ School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA.
² National Engineering Laboratory for Reducing Emissions from Coal Combustion, School of Energy and Power Engineering, Shandong University, Jinan, 250061, P. R. China.
³ College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325035, P. R. China.
⁴ Department of Chemistry, Emory University, Atlanta, GA, 30322, USA.
⁵ Department of Applied Physical Sciences, University of North Carolina, Chapel Hill, NC, 27599, USA.

PMID: 32406152
DOI: 10.1002/adma.202000999

Abstract

2D black phosphorene (BP) carries a stellar set of physical properties such as conveniently tunable bandgap and extremely high ambipolar carrier mobility for optoelectronic devices. Herein, the judicious design and positioning of BP with tailored thickness as dual-functional nanomaterials to concurrently enhance carrier extraction at both electron transport layer/perovskite and perovskite/hole transport layer interfaces for high-efficiency and stable perovskite solar cells is reported. The synergy of favorable band energy alignment and concerted cascade interfacial carrier extraction, rendered by concurrent positioning of BP, delivered a progressively enhanced power conversion efficiency of 19.83% from 16.95% (BP-free). Investigation into interfacial engineering further reveals enhanced light absorption and reduced trap density for improved photovoltaic performance with BP incorporation. This work demonstrates the appealing characteristic of rational implementation of BP as dual-functional transport material for a diversity of optoelectronic devices, including photodetectors, sensors, light-emitting diodes, etc.

Keywords: ambipolar carrier mobility; band energy alignment; black phosphorene; cascade interfacial carrier extraction; perovskite solar cells.

Abstract

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